1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; RUN: opt -loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S %s | FileCheck %s 3 4 5@p = external local_unnamed_addr global [257 x i32], align 16 6@q = external local_unnamed_addr global [257 x i32], align 16 7 8; Test case for PR43398. 9 10define void @can_sink_after_store(i32 %x, i32* %ptr, i64 %tc) local_unnamed_addr #0 { 11; CHECK-LABEL: @can_sink_after_store( 12; CHECK-NEXT: entry: 13; CHECK-NEXT: br label [[PREHEADER:%.*]] 14; CHECK: preheader: 15; CHECK-NEXT: [[IDX_PHI_TRANS:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 16; CHECK-NEXT: [[DOTPRE:%.*]] = load i32, i32* [[IDX_PHI_TRANS]], align 4 17; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]] 18; CHECK: vector.ph: 19; CHECK-NEXT: [[VECTOR_RECUR_INIT:%.*]] = insertelement <4 x i32> poison, i32 [[DOTPRE]], i32 3 20; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[X:%.*]], i32 0 21; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer 22; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 23; CHECK: vector.body: 24; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 25; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i32> [ [[VECTOR_RECUR_INIT]], [[VECTOR_PH]] ], [ [[WIDE_LOAD:%.*]], [[VECTOR_BODY]] ] 26; CHECK-NEXT: [[OFFSET_IDX:%.*]] = add i64 1, [[INDEX]] 27; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], 0 28; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[TMP0]] 29; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, i32* [[TMP1]], i32 0 30; CHECK-NEXT: [[TMP3:%.*]] = bitcast i32* [[TMP2]] to <4 x i32>* 31; CHECK-NEXT: [[WIDE_LOAD]] = load <4 x i32>, <4 x i32>* [[TMP3]], align 4 32; CHECK-NEXT: [[TMP4:%.*]] = shufflevector <4 x i32> [[VECTOR_RECUR]], <4 x i32> [[WIDE_LOAD]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 33; CHECK-NEXT: [[TMP5:%.*]] = add <4 x i32> [[TMP4]], [[BROADCAST_SPLAT]] 34; CHECK-NEXT: [[TMP6:%.*]] = add <4 x i32> [[TMP5]], [[WIDE_LOAD]] 35; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[TMP0]] 36; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, i32* [[TMP7]], i32 0 37; CHECK-NEXT: [[TMP9:%.*]] = bitcast i32* [[TMP8]] to <4 x i32>* 38; CHECK-NEXT: store <4 x i32> [[TMP6]], <4 x i32>* [[TMP9]], align 4 39; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4 40; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1996 41; CHECK-NEXT: br i1 [[TMP10]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]] 42; CHECK: middle.block: 43; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 1999, 1996 44; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i32 3 45; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i32 2 46; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]] 47; CHECK: scalar.ph: 48; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i32 [ [[DOTPRE]], [[PREHEADER]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 49; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 1997, [[MIDDLE_BLOCK]] ], [ 1, [[PREHEADER]] ] 50; CHECK-NEXT: br label [[FOR:%.*]] 51; CHECK: for: 52; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i32 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[PRE_NEXT:%.*]], [[FOR]] ] 53; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR]] ] 54; CHECK-NEXT: [[ADD_1:%.*]] = add i32 [[SCALAR_RECUR]], [[X]] 55; CHECK-NEXT: [[IDX_1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[IV]] 56; CHECK-NEXT: [[PRE_NEXT]] = load i32, i32* [[IDX_1]], align 4 57; CHECK-NEXT: [[ADD_2:%.*]] = add i32 [[ADD_1]], [[PRE_NEXT]] 58; CHECK-NEXT: [[IDX_2:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[IV]] 59; CHECK-NEXT: store i32 [[ADD_2]], i32* [[IDX_2]], align 4 60; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 61; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 2000 62; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT]], label [[FOR]], !llvm.loop [[LOOP2:![0-9]+]] 63; CHECK: exit: 64; CHECK-NEXT: ret void 65; 66 67entry: 68 br label %preheader 69 70preheader: 71 %idx.phi.trans = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 72 %.pre = load i32, i32* %idx.phi.trans, align 4 73 br label %for 74 75for: 76 %pre.phi = phi i32 [ %.pre, %preheader ], [ %pre.next, %for ] 77 %iv = phi i64 [ 1, %preheader ], [ %iv.next, %for ] 78 %add.1 = add i32 %pre.phi, %x 79 %idx.1 = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 %iv 80 %pre.next = load i32, i32* %idx.1, align 4 81 %add.2 = add i32 %add.1, %pre.next 82 %idx.2 = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 %iv 83 store i32 %add.2, i32* %idx.2, align 4 84 %iv.next = add nuw nsw i64 %iv, 1 85 %exitcond = icmp eq i64 %iv.next, 2000 86 br i1 %exitcond, label %exit, label %for 87 88exit: 89 ret void 90} 91 92; We can sink potential trapping instructions, as this will only delay the trap 93; and not introduce traps on additional paths. 94define void @sink_sdiv(i32 %x, i32* %ptr, i64 %tc) local_unnamed_addr #0 { 95; CHECK-LABEL: @sink_sdiv( 96; CHECK-NEXT: entry: 97; CHECK-NEXT: br label [[PREHEADER:%.*]] 98; CHECK: preheader: 99; CHECK-NEXT: [[IDX_PHI_TRANS:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 100; CHECK-NEXT: [[DOTPRE:%.*]] = load i32, i32* [[IDX_PHI_TRANS]], align 4 101; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]] 102; CHECK: vector.ph: 103; CHECK-NEXT: [[VECTOR_RECUR_INIT:%.*]] = insertelement <4 x i32> poison, i32 [[DOTPRE]], i32 3 104; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[X:%.*]], i32 0 105; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer 106; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 107; CHECK: vector.body: 108; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 109; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i32> [ [[VECTOR_RECUR_INIT]], [[VECTOR_PH]] ], [ [[WIDE_LOAD:%.*]], [[VECTOR_BODY]] ] 110; CHECK-NEXT: [[OFFSET_IDX:%.*]] = add i64 1, [[INDEX]] 111; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], 0 112; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[TMP0]] 113; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, i32* [[TMP1]], i32 0 114; CHECK-NEXT: [[TMP3:%.*]] = bitcast i32* [[TMP2]] to <4 x i32>* 115; CHECK-NEXT: [[WIDE_LOAD]] = load <4 x i32>, <4 x i32>* [[TMP3]], align 4 116; CHECK-NEXT: [[TMP4:%.*]] = shufflevector <4 x i32> [[VECTOR_RECUR]], <4 x i32> [[WIDE_LOAD]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 117; CHECK-NEXT: [[TMP5:%.*]] = sdiv <4 x i32> [[TMP4]], [[BROADCAST_SPLAT]] 118; CHECK-NEXT: [[TMP6:%.*]] = add <4 x i32> [[TMP5]], [[WIDE_LOAD]] 119; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[TMP0]] 120; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, i32* [[TMP7]], i32 0 121; CHECK-NEXT: [[TMP9:%.*]] = bitcast i32* [[TMP8]] to <4 x i32>* 122; CHECK-NEXT: store <4 x i32> [[TMP6]], <4 x i32>* [[TMP9]], align 4 123; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4 124; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1996 125; CHECK-NEXT: br i1 [[TMP10]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP4:![0-9]+]] 126; CHECK: middle.block: 127; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 1999, 1996 128; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i32 3 129; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i32 2 130; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]] 131; CHECK: scalar.ph: 132; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i32 [ [[DOTPRE]], [[PREHEADER]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 133; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 1997, [[MIDDLE_BLOCK]] ], [ 1, [[PREHEADER]] ] 134; CHECK-NEXT: br label [[FOR:%.*]] 135; CHECK: for: 136; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i32 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[PRE_NEXT:%.*]], [[FOR]] ] 137; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR]] ] 138; CHECK-NEXT: [[DIV_1:%.*]] = sdiv i32 [[SCALAR_RECUR]], [[X]] 139; CHECK-NEXT: [[IDX_1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[IV]] 140; CHECK-NEXT: [[PRE_NEXT]] = load i32, i32* [[IDX_1]], align 4 141; CHECK-NEXT: [[ADD_2:%.*]] = add i32 [[DIV_1]], [[PRE_NEXT]] 142; CHECK-NEXT: [[IDX_2:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[IV]] 143; CHECK-NEXT: store i32 [[ADD_2]], i32* [[IDX_2]], align 4 144; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 145; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 2000 146; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT]], label [[FOR]], !llvm.loop [[LOOP5:![0-9]+]] 147; CHECK: exit: 148; CHECK-NEXT: ret void 149; 150 151entry: 152 br label %preheader 153 154preheader: 155 %idx.phi.trans = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 156 %.pre = load i32, i32* %idx.phi.trans, align 4 157 br label %for 158 159for: 160 %pre.phi = phi i32 [ %.pre, %preheader ], [ %pre.next, %for ] 161 %iv = phi i64 [ 1, %preheader ], [ %iv.next, %for ] 162 %div.1 = sdiv i32 %pre.phi, %x 163 %idx.1 = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 %iv 164 %pre.next = load i32, i32* %idx.1, align 4 165 %add.2 = add i32 %div.1, %pre.next 166 %idx.2 = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 %iv 167 store i32 %add.2, i32* %idx.2, align 4 168 %iv.next = add nuw nsw i64 %iv, 1 169 %exitcond = icmp eq i64 %iv.next, 2000 170 br i1 %exitcond, label %exit, label %for 171 172exit: 173 ret void 174} 175 176; Sink users of %pre.phi recursively. 177define void @can_sink_with_additional_user(i32 %x, i32* %ptr, i64 %tc) { 178; CHECK-LABEL: @can_sink_with_additional_user( 179; CHECK-NEXT: entry: 180; CHECK-NEXT: br label [[PREHEADER:%.*]] 181; CHECK: preheader: 182; CHECK-NEXT: [[IDX_PHI_TRANS:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 183; CHECK-NEXT: [[DOTPRE:%.*]] = load i32, i32* [[IDX_PHI_TRANS]], align 4 184; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]] 185; CHECK: vector.ph: 186; CHECK-NEXT: [[VECTOR_RECUR_INIT:%.*]] = insertelement <4 x i32> poison, i32 [[DOTPRE]], i32 3 187; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[X:%.*]], i32 0 188; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer 189; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 190; CHECK: vector.body: 191; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 192; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i32> [ [[VECTOR_RECUR_INIT]], [[VECTOR_PH]] ], [ [[WIDE_LOAD:%.*]], [[VECTOR_BODY]] ] 193; CHECK-NEXT: [[OFFSET_IDX:%.*]] = add i64 1, [[INDEX]] 194; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[OFFSET_IDX]], 0 195; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[TMP0]] 196; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i32, i32* [[TMP1]], i32 0 197; CHECK-NEXT: [[TMP3:%.*]] = bitcast i32* [[TMP2]] to <4 x i32>* 198; CHECK-NEXT: [[WIDE_LOAD]] = load <4 x i32>, <4 x i32>* [[TMP3]], align 4 199; CHECK-NEXT: [[TMP4:%.*]] = shufflevector <4 x i32> [[VECTOR_RECUR]], <4 x i32> [[WIDE_LOAD]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 200; CHECK-NEXT: [[TMP5:%.*]] = add <4 x i32> [[TMP4]], [[BROADCAST_SPLAT]] 201; CHECK-NEXT: [[TMP6:%.*]] = add <4 x i32> [[TMP5]], [[BROADCAST_SPLAT]] 202; CHECK-NEXT: [[TMP7:%.*]] = add <4 x i32> [[TMP5]], [[WIDE_LOAD]] 203; CHECK-NEXT: [[TMP8:%.*]] = add <4 x i32> [[TMP6]], [[TMP7]] 204; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[TMP0]] 205; CHECK-NEXT: [[TMP10:%.*]] = getelementptr inbounds i32, i32* [[TMP9]], i32 0 206; CHECK-NEXT: [[TMP11:%.*]] = bitcast i32* [[TMP10]] to <4 x i32>* 207; CHECK-NEXT: store <4 x i32> [[TMP8]], <4 x i32>* [[TMP11]], align 4 208; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4 209; CHECK-NEXT: [[TMP12:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1996 210; CHECK-NEXT: br i1 [[TMP12]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP6:![0-9]+]] 211; CHECK: middle.block: 212; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 1999, 1996 213; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i32 3 214; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x i32> [[WIDE_LOAD]], i32 2 215; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]] 216; CHECK: scalar.ph: 217; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i32 [ [[DOTPRE]], [[PREHEADER]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 218; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 1997, [[MIDDLE_BLOCK]] ], [ 1, [[PREHEADER]] ] 219; CHECK-NEXT: br label [[FOR:%.*]] 220; CHECK: for: 221; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i32 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[PRE_NEXT:%.*]], [[FOR]] ] 222; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[FOR]] ] 223; CHECK-NEXT: [[ADD_1:%.*]] = add i32 [[SCALAR_RECUR]], [[X]] 224; CHECK-NEXT: [[ADD_2:%.*]] = add i32 [[ADD_1]], [[X]] 225; CHECK-NEXT: [[IDX_1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[IV]] 226; CHECK-NEXT: [[PRE_NEXT]] = load i32, i32* [[IDX_1]], align 4 227; CHECK-NEXT: [[ADD_3:%.*]] = add i32 [[ADD_1]], [[PRE_NEXT]] 228; CHECK-NEXT: [[ADD_4:%.*]] = add i32 [[ADD_2]], [[ADD_3]] 229; CHECK-NEXT: [[IDX_2:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[IV]] 230; CHECK-NEXT: store i32 [[ADD_4]], i32* [[IDX_2]], align 4 231; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 232; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 2000 233; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT]], label [[FOR]], !llvm.loop [[LOOP7:![0-9]+]] 234; CHECK: exit: 235; CHECK-NEXT: ret void 236; 237 238 239 240entry: 241 br label %preheader 242 243preheader: 244 %idx.phi.trans = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 245 %.pre = load i32, i32* %idx.phi.trans, align 4 246 br label %for 247 248for: 249 %pre.phi = phi i32 [ %.pre, %preheader ], [ %pre.next, %for ] 250 %iv = phi i64 [ 1, %preheader ], [ %iv.next, %for ] 251 %add.1 = add i32 %pre.phi, %x 252 %add.2 = add i32 %add.1, %x 253 %idx.1 = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 %iv 254 %pre.next = load i32, i32* %idx.1, align 4 255 %add.3 = add i32 %add.1, %pre.next 256 %add.4 = add i32 %add.2, %add.3 257 %idx.2 = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 %iv 258 store i32 %add.4, i32* %idx.2, align 4 259 %iv.next = add nuw nsw i64 %iv, 1 260 %exitcond = icmp eq i64 %iv.next, 2000 261 br i1 %exitcond, label %exit, label %for 262 263exit: 264 ret void 265} 266 267; FIXME: We can sink a store, if we can guarantee that it does not alias any 268; loads/stores in between. 269define void @cannot_sink_store(i32 %x, i32* %ptr, i64 %tc) { 270; CHECK-LABEL: @cannot_sink_store( 271; CHECK-NEXT: entry: 272; CHECK-NEXT: br label [[PREHEADER:%.*]] 273; CHECK: preheader: 274; CHECK-NEXT: [[IDX_PHI_TRANS:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 275; CHECK-NEXT: [[DOTPRE:%.*]] = load i32, i32* [[IDX_PHI_TRANS]], align 4 276; CHECK-NEXT: br label [[FOR:%.*]] 277; CHECK: for: 278; CHECK-NEXT: [[PRE_PHI:%.*]] = phi i32 [ [[DOTPRE]], [[PREHEADER]] ], [ [[PRE_NEXT:%.*]], [[FOR]] ] 279; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 1, [[PREHEADER]] ], [ [[IV_NEXT:%.*]], [[FOR]] ] 280; CHECK-NEXT: [[ADD_1:%.*]] = add i32 [[PRE_PHI]], [[X:%.*]] 281; CHECK-NEXT: store i32 [[ADD_1]], i32* [[PTR:%.*]], align 4 282; CHECK-NEXT: [[IDX_1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[IV]] 283; CHECK-NEXT: [[PRE_NEXT]] = load i32, i32* [[IDX_1]], align 4 284; CHECK-NEXT: [[ADD_2:%.*]] = add i32 [[ADD_1]], [[PRE_NEXT]] 285; CHECK-NEXT: [[IDX_2:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[IV]] 286; CHECK-NEXT: store i32 [[ADD_2]], i32* [[IDX_2]], align 4 287; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 288; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 2000 289; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[FOR]] 290; CHECK: exit: 291; CHECK-NEXT: ret void 292; 293 294 295 296entry: 297 br label %preheader 298 299preheader: 300 %idx.phi.trans = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 301 %.pre = load i32, i32* %idx.phi.trans, align 4 302 br label %for 303 304for: 305 %pre.phi = phi i32 [ %.pre, %preheader ], [ %pre.next, %for ] 306 %iv = phi i64 [ 1, %preheader ], [ %iv.next, %for ] 307 %add.1 = add i32 %pre.phi, %x 308 store i32 %add.1, i32* %ptr 309 %idx.1 = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 %iv 310 %pre.next = load i32, i32* %idx.1, align 4 311 %add.2 = add i32 %add.1, %pre.next 312 %idx.2 = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 %iv 313 store i32 %add.2, i32* %idx.2, align 4 314 %iv.next = add nuw nsw i64 %iv, 1 315 %exitcond = icmp eq i64 %iv.next, 2000 316 br i1 %exitcond, label %exit, label %for 317 318exit: 319 ret void 320} 321 322; Some kinds of reductions are not detected by IVDescriptors. If we have a 323; cycle, we cannot sink it. 324define void @cannot_sink_reduction(i32 %x, i32* %ptr, i64 %tc) { 325; CHECK-LABEL: @cannot_sink_reduction( 326; CHECK-NEXT: entry: 327; CHECK-NEXT: br label [[PREHEADER:%.*]] 328; CHECK: preheader: 329; CHECK-NEXT: [[IDX_PHI_TRANS:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 330; CHECK-NEXT: [[DOTPRE:%.*]] = load i32, i32* [[IDX_PHI_TRANS]], align 4 331; CHECK-NEXT: br label [[FOR:%.*]] 332; CHECK: for: 333; CHECK-NEXT: [[PRE_PHI:%.*]] = phi i32 [ [[DOTPRE]], [[PREHEADER]] ], [ [[D:%.*]], [[FOR]] ] 334; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 1, [[PREHEADER]] ], [ [[IV_NEXT:%.*]], [[FOR]] ] 335; CHECK-NEXT: [[D]] = sdiv i32 [[PRE_PHI]], [[X:%.*]] 336; CHECK-NEXT: [[IDX_1:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 [[IV]] 337; CHECK-NEXT: [[PRE_NEXT:%.*]] = load i32, i32* [[IDX_1]], align 4 338; CHECK-NEXT: [[ADD_2:%.*]] = add i32 [[X]], [[PRE_NEXT]] 339; CHECK-NEXT: [[IDX_2:%.*]] = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 [[IV]] 340; CHECK-NEXT: store i32 [[ADD_2]], i32* [[IDX_2]], align 4 341; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 342; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV_NEXT]], 2000 343; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[FOR]] 344; CHECK: exit: 345; CHECK-NEXT: ret void 346; 347 348 349 350; CHECK-NET: ret void 351entry: 352 br label %preheader 353 354preheader: 355 %idx.phi.trans = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 1 356 %.pre = load i32, i32* %idx.phi.trans, align 4 357 br label %for 358 359for: 360 %pre.phi = phi i32 [ %.pre, %preheader ], [ %d, %for ] 361 %iv = phi i64 [ 1, %preheader ], [ %iv.next, %for ] 362 %d = sdiv i32 %pre.phi, %x 363 %idx.1 = getelementptr inbounds [257 x i32], [257 x i32]* @p, i64 0, i64 %iv 364 %pre.next = load i32, i32* %idx.1, align 4 365 %add.2 = add i32 %x, %pre.next 366 %idx.2 = getelementptr inbounds [257 x i32], [257 x i32]* @q, i64 0, i64 %iv 367 store i32 %add.2, i32* %idx.2, align 4 368 %iv.next = add nuw nsw i64 %iv, 1 369 %exitcond = icmp eq i64 %iv.next, 2000 370 br i1 %exitcond, label %exit, label %for 371 372exit: 373 ret void 374} 375 376; Sink %tmp38 after %tmp60, then it enable the loop vectorization. 377define void @instruction_with_2_FOR_operands(float* noalias %A, float* noalias %B, float* noalias %C) { 378; CHECK-LABEL: @instruction_with_2_FOR_operands( 379; CHECK-NEXT: bb: 380; CHECK-NEXT: br i1 false, label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]] 381; CHECK: vector.ph: 382; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 383; CHECK: vector.body: 384; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 385; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x float> [ <float poison, float poison, float poison, float 0.000000e+00>, [[VECTOR_PH]] ], [ [[BROADCAST_SPLAT3:%.*]], [[VECTOR_BODY]] ] 386; CHECK-NEXT: [[VECTOR_RECUR1:%.*]] = phi <4 x float> [ <float poison, float poison, float poison, float 1.000000e+00>, [[VECTOR_PH]] ], [ [[BROADCAST_SPLAT:%.*]], [[VECTOR_BODY]] ] 387; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[INDEX]], 0 388; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds float, float* [[C:%.*]], i64 [[TMP0]] 389; CHECK-NEXT: [[TMP2:%.*]] = load float, float* [[A:%.*]], align 4 390; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x float> poison, float [[TMP2]], i32 0 391; CHECK-NEXT: [[BROADCAST_SPLAT]] = shufflevector <4 x float> [[BROADCAST_SPLATINSERT]], <4 x float> poison, <4 x i32> zeroinitializer 392; CHECK-NEXT: [[TMP3:%.*]] = shufflevector <4 x float> [[VECTOR_RECUR1]], <4 x float> [[BROADCAST_SPLAT]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 393; CHECK-NEXT: [[TMP4:%.*]] = load float, float* [[B:%.*]], align 4 394; CHECK-NEXT: [[BROADCAST_SPLATINSERT2:%.*]] = insertelement <4 x float> poison, float [[TMP4]], i32 0 395; CHECK-NEXT: [[BROADCAST_SPLAT3]] = shufflevector <4 x float> [[BROADCAST_SPLATINSERT2]], <4 x float> poison, <4 x i32> zeroinitializer 396; CHECK-NEXT: [[TMP5:%.*]] = shufflevector <4 x float> [[VECTOR_RECUR]], <4 x float> [[BROADCAST_SPLAT3]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 397; CHECK-NEXT: [[TMP6:%.*]] = fmul fast <4 x float> [[TMP5]], [[TMP3]] 398; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds float, float* [[TMP1]], i32 0 399; CHECK-NEXT: [[TMP8:%.*]] = bitcast float* [[TMP7]] to <4 x float>* 400; CHECK-NEXT: store <4 x float> [[TMP6]], <4 x float>* [[TMP8]], align 4 401; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4 402; CHECK-NEXT: [[TMP9:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1000 403; CHECK-NEXT: br i1 [[TMP9]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]] 404; CHECK: middle.block: 405; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 1001, 1000 406; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x float> [[BROADCAST_SPLAT3]], i32 3 407; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x float> [[BROADCAST_SPLAT3]], i32 2 408; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT4:%.*]] = extractelement <4 x float> [[BROADCAST_SPLAT]], i32 3 409; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI5:%.*]] = extractelement <4 x float> [[BROADCAST_SPLAT]], i32 2 410; CHECK-NEXT: br i1 [[CMP_N]], label [[BB74:%.*]], label [[SCALAR_PH]] 411; CHECK: scalar.ph: 412; CHECK-NEXT: [[SCALAR_RECUR_INIT6:%.*]] = phi float [ 1.000000e+00, [[BB:%.*]] ], [ [[VECTOR_RECUR_EXTRACT4]], [[MIDDLE_BLOCK]] ] 413; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi float [ 0.000000e+00, [[BB]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 414; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 1000, [[MIDDLE_BLOCK]] ], [ 0, [[BB]] ] 415; CHECK-NEXT: br label [[BB13:%.*]] 416; CHECK: bb13: 417; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi float [ [[TMP60:%.*]], [[BB13]] ], [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ] 418; CHECK-NEXT: [[SCALAR_RECUR7:%.*]] = phi float [ [[TMP49:%.*]], [[BB13]] ], [ [[SCALAR_RECUR_INIT6]], [[SCALAR_PH]] ] 419; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], [[BB13]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ] 420; CHECK-NEXT: [[TMP38:%.*]] = fmul fast float [[SCALAR_RECUR]], [[SCALAR_RECUR7]] 421; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 422; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds float, float* [[C]], i64 [[IV]] 423; CHECK-NEXT: [[TMP49]] = load float, float* [[A]], align 4 424; CHECK-NEXT: [[TMP60]] = load float, float* [[B]], align 4 425; CHECK-NEXT: store float [[TMP38]], float* [[GEP]], align 4 426; CHECK-NEXT: [[TMP12:%.*]] = icmp slt i64 [[IV]], 1000 427; CHECK-NEXT: br i1 [[TMP12]], label [[BB13]], label [[BB74]], !llvm.loop [[LOOP9:![0-9]+]] 428; CHECK: bb74: 429; CHECK-NEXT: ret void 430; 431bb: 432 br label %bb13 433 434bb13: ; preds = %bb13, %bb 435 %tmp37 = phi float [ %tmp60, %bb13 ], [ 0.0, %bb ] 436 %tmp27 = phi float [ %tmp49, %bb13 ], [ 1.0, %bb ] 437 %iv = phi i64 [ %iv.next, %bb13 ], [ 0, %bb ] 438 %tmp38 = fmul fast float %tmp37, %tmp27 439 %iv.next = add nuw nsw i64 %iv, 1 440 %gep = getelementptr inbounds float, float* %C, i64 %iv 441 %tmp49 = load float, float* %A, align 4 442 %tmp60 = load float, float* %B, align 4 443 store float %tmp38, float* %gep 444 %tmp12 = icmp slt i64 %iv, 1000 445 br i1 %tmp12, label %bb13, label %bb74 446 447bb74: ; preds = %bb13 448 ret void 449} 450 451define void @instruction_with_2_FOR_operands_and_multiple_other_uses(float* noalias %dst.1, float* noalias %dst.2, float* noalias %dst.3, float* noalias %for.ptr.1, float* noalias %for.ptr.2) { 452; CHECK-LABEL: @instruction_with_2_FOR_operands_and_multiple_other_uses( 453; CHECK-NEXT: bb: 454; CHECK-NEXT: br label [[LOOP:%.*]] 455; CHECK: loop: 456; CHECK-NEXT: [[FOR_1:%.*]] = phi float [ 0.000000e+00, [[BB:%.*]] ], [ [[FOR_1_NEXT:%.*]], [[LOOP]] ] 457; CHECK-NEXT: [[FOR_2:%.*]] = phi float [ 0.000000e+00, [[BB]] ], [ [[FOR_2_NEXT:%.*]], [[LOOP]] ] 458; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, [[BB]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] 459; CHECK-NEXT: [[FOR_1_USE_1:%.*]] = fmul fast float [[FOR_1]], 2.000000e+00 460; CHECK-NEXT: [[USED_BY_BOTH:%.*]] = fmul fast float [[FOR_1]], [[FOR_2]] 461; CHECK-NEXT: [[FOR_2_NEXT]] = load float, float* [[FOR_PTR_2:%.*]], align 4 462; CHECK-NEXT: [[FOR_1_USE_3:%.*]] = fadd fast float [[FOR_1]], 1.000000e+00 463; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 464; CHECK-NEXT: [[FOR_1_NEXT]] = load float, float* [[FOR_PTR_1:%.*]], align 4 465; CHECK-NEXT: [[GEP_DST_1:%.*]] = getelementptr inbounds float, float* [[DST_1:%.*]], i64 [[IV]] 466; CHECK-NEXT: store float [[USED_BY_BOTH]], float* [[GEP_DST_1]], align 4 467; CHECK-NEXT: [[GEP_DST_2:%.*]] = getelementptr inbounds float, float* [[DST_2:%.*]], i64 [[IV]] 468; CHECK-NEXT: store float [[FOR_1_USE_1]], float* [[GEP_DST_2]], align 4 469; CHECK-NEXT: [[GEP_DST_3:%.*]] = getelementptr inbounds float, float* [[DST_3:%.*]], i64 [[IV]] 470; CHECK-NEXT: store float [[FOR_1_USE_3]], float* [[GEP_DST_3]], align 4 471; CHECK-NEXT: [[EC:%.*]] = icmp slt i64 [[IV]], 1000 472; CHECK-NEXT: br i1 [[EC]], label [[LOOP]], label [[EXIT:%.*]] 473; CHECK: exit: 474; CHECK-NEXT: ret void 475; 476bb: 477 br label %loop 478 479loop: 480 %for.1 = phi float [ 0.0, %bb ], [ %for.1.next, %loop] 481 %for.2 = phi float [ 0.0, %bb ], [ %for.2.next, %loop] 482 %iv = phi i64 [ 0, %bb ], [ %iv.next, %loop ] 483 %for.1.use.1 = fmul fast float %for.1, 2.0 484 %used.by.both = fmul fast float %for.1, %for.2 485 %for.2.next = load float, float* %for.ptr.2, align 4 486 %for.1.use.3 = fadd fast float %for.1, 1.0 487 %iv.next = add nuw nsw i64 %iv, 1 488 %for.1.next = load float, float* %for.ptr.1, align 4 489 %gep.dst.1 = getelementptr inbounds float, float* %dst.1, i64 %iv 490 store float %used.by.both, float* %gep.dst.1 491 %gep.dst.2 = getelementptr inbounds float, float* %dst.2, i64 %iv 492 store float %for.1.use.1, float* %gep.dst.2 493 %gep.dst.3 = getelementptr inbounds float, float* %dst.3, i64 %iv 494 store float %for.1.use.3, float* %gep.dst.3 495 %ec = icmp slt i64 %iv, 1000 496 br i1 %ec, label %loop, label %exit 497 498exit: 499 ret void 500} 501 502; Variation of @instruction_with_2_FOR_operands_and_multiple_other_uses, with 503; multiple instructions in a chain from for.1 to %used.by.both. 504define void @instruction_with_2_FOR_operands_and_multiple_other_uses_chain(float* noalias %dst.1, float* noalias %dst.2, float* noalias %dst.3, float* noalias %for.ptr.1, float* noalias %for.ptr.2) { 505; CHECK-LABEL: @instruction_with_2_FOR_operands_and_multiple_other_uses_chain( 506; CHECK-NEXT: bb: 507; CHECK-NEXT: br label [[LOOP:%.*]] 508; CHECK: loop: 509; CHECK-NEXT: [[FOR_1:%.*]] = phi float [ 0.000000e+00, [[BB:%.*]] ], [ [[FOR_1_NEXT:%.*]], [[LOOP]] ] 510; CHECK-NEXT: [[FOR_2:%.*]] = phi float [ 0.000000e+00, [[BB]] ], [ [[FOR_2_NEXT:%.*]], [[LOOP]] ] 511; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, [[BB]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] 512; CHECK-NEXT: [[FOR_1_USE_1:%.*]] = fmul fast float [[FOR_1]], 2.000000e+00 513; CHECK-NEXT: [[FOR_1_USE_C:%.*]] = fmul fast float [[FOR_1_USE_1]], 2.000000e+00 514; CHECK-NEXT: [[USED_BY_BOTH:%.*]] = fmul fast float [[FOR_1_USE_C]], [[FOR_2]] 515; CHECK-NEXT: [[FOR_2_NEXT]] = load float, float* [[FOR_PTR_2:%.*]], align 4 516; CHECK-NEXT: [[FOR_1_USE_3:%.*]] = fadd fast float [[FOR_1]], 1.000000e+00 517; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 518; CHECK-NEXT: [[FOR_1_NEXT]] = load float, float* [[FOR_PTR_1:%.*]], align 4 519; CHECK-NEXT: [[GEP_DST_1:%.*]] = getelementptr inbounds float, float* [[DST_1:%.*]], i64 [[IV]] 520; CHECK-NEXT: store float [[USED_BY_BOTH]], float* [[GEP_DST_1]], align 4 521; CHECK-NEXT: [[GEP_DST_2:%.*]] = getelementptr inbounds float, float* [[DST_2:%.*]], i64 [[IV]] 522; CHECK-NEXT: store float [[FOR_1_USE_1]], float* [[GEP_DST_2]], align 4 523; CHECK-NEXT: [[GEP_DST_3:%.*]] = getelementptr inbounds float, float* [[DST_3:%.*]], i64 [[IV]] 524; CHECK-NEXT: store float [[FOR_1_USE_3]], float* [[GEP_DST_3]], align 4 525; CHECK-NEXT: [[EC:%.*]] = icmp slt i64 [[IV]], 1000 526; CHECK-NEXT: br i1 [[EC]], label [[LOOP]], label [[EXIT:%.*]] 527; CHECK: exit: 528; CHECK-NEXT: ret void 529; 530bb: 531 br label %loop 532 533loop: 534 %for.1 = phi float [ 0.0, %bb ], [ %for.1.next, %loop] 535 %for.2 = phi float [ 0.0, %bb ], [ %for.2.next, %loop] 536 %iv = phi i64 [ 0, %bb ], [ %iv.next, %loop ] 537 %for.1.use.1 = fmul fast float %for.1, 2.0 538 %for.1.use.c = fmul fast float %for.1.use.1, 2.0 539 %used.by.both = fmul fast float %for.1.use.c, %for.2 540 %for.2.next = load float, float* %for.ptr.2, align 4 541 %for.1.use.3 = fadd fast float %for.1, 1.0 542 %iv.next = add nuw nsw i64 %iv, 1 543 %for.1.next = load float, float* %for.ptr.1, align 4 544 %gep.dst.1 = getelementptr inbounds float, float* %dst.1, i64 %iv 545 store float %used.by.both, float* %gep.dst.1 546 %gep.dst.2 = getelementptr inbounds float, float* %dst.2, i64 %iv 547 store float %for.1.use.1, float* %gep.dst.2 548 %gep.dst.3 = getelementptr inbounds float, float* %dst.3, i64 %iv 549 store float %for.1.use.3, float* %gep.dst.3 550 %ec = icmp slt i64 %iv, 1000 551 br i1 %ec, label %loop, label %exit 552 553exit: 554 ret void 555} 556 557; The (first) reason `%first_time.1` cannot be sunk is because it appears outside 558; the header and is not dominated by Previous. The fact that it feeds Previous 559; is a second sinking-preventing reason. 560define void @cannot_sink_phi(i32* %ptr) { 561; CHECK-LABEL: @cannot_sink_phi( 562; CHECK-NEXT: entry: 563; CHECK-NEXT: br label [[LOOP_HEADER:%.*]] 564; CHECK: loop.header: 565; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 1, [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[LOOP_LATCH:%.*]] ] 566; CHECK-NEXT: [[FOR:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[FOR_NEXT:%.*]], [[LOOP_LATCH]] ] 567; CHECK-NEXT: [[C_1:%.*]] = icmp ult i64 [[IV]], 500 568; CHECK-NEXT: br i1 [[C_1]], label [[IF_TRUEBB:%.*]], label [[IF_FALSEBB:%.*]] 569; CHECK: if.truebb: 570; CHECK-NEXT: br label [[LOOP_LATCH]] 571; CHECK: if.falsebb: 572; CHECK-NEXT: br label [[LOOP_LATCH]] 573; CHECK: loop.latch: 574; CHECK-NEXT: [[FIRST_TIME_1:%.*]] = phi i32 [ 20, [[IF_TRUEBB]] ], [ [[FOR]], [[IF_FALSEBB]] ] 575; CHECK-NEXT: [[C_2:%.*]] = icmp ult i64 [[IV]], 800 576; CHECK-NEXT: [[FOR_NEXT]] = select i1 [[C_2]], i32 30, i32 [[FIRST_TIME_1]] 577; CHECK-NEXT: [[PTR_IDX:%.*]] = getelementptr i32, i32* [[PTR:%.*]], i64 [[IV]] 578; CHECK-NEXT: store i32 [[FOR_NEXT]], i32* [[PTR_IDX]], align 4 579; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1 580; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[IV_NEXT]], 1000 581; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[EXIT:%.*]], label [[LOOP_HEADER]] 582; CHECK: exit: 583; CHECK-NEXT: ret void 584; 585entry: 586 br label %loop.header 587 588loop.header: 589 %iv = phi i64 [ 1, %entry ], [ %iv.next, %loop.latch ] 590 %for = phi i32 [ 0, %entry ], [ %for.next, %loop.latch ] 591 %c.1 = icmp ult i64 %iv, 500 592 br i1 %c.1, label %if.truebb, label %if.falsebb 593 594if.truebb: 595 br label %loop.latch 596 597if.falsebb: 598 br label %loop.latch 599 600loop.latch: 601 %first_time.1 = phi i32 [ 20, %if.truebb ], [ %for, %if.falsebb ] 602 %c.2 = icmp ult i64 %iv, 800 603 %for.next = select i1 %c.2, i32 30, i32 %first_time.1 604 %ptr.idx = getelementptr i32, i32* %ptr, i64 %iv 605 store i32 %for.next, i32* %ptr.idx 606 %iv.next = add nuw nsw i64 %iv, 1 607 %exitcond.not = icmp eq i64 %iv.next, 1000 608 br i1 %exitcond.not, label %exit, label %loop.header 609 610exit: 611 ret void 612} 613 614; A recurrence in a multiple exit loop. 615define i16 @multiple_exit(i16* %p, i32 %n) { 616; CHECK-LABEL: @multiple_exit( 617; CHECK-NEXT: entry: 618; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[N:%.*]], i32 0) 619; CHECK-NEXT: [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[SMAX]], i32 2096) 620; CHECK-NEXT: [[TMP0:%.*]] = add nuw nsw i32 [[UMIN]], 1 621; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ule i32 [[TMP0]], 4 622; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]] 623; CHECK: vector.ph: 624; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[TMP0]], 4 625; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[N_MOD_VF]], 0 626; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 4, i32 [[N_MOD_VF]] 627; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[TMP0]], [[TMP2]] 628; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 629; CHECK: vector.body: 630; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 631; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ] 632; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i16> [ <i16 poison, i16 poison, i16 poison, i16 0>, [[VECTOR_PH]] ], [ [[WIDE_LOAD:%.*]], [[VECTOR_BODY]] ] 633; CHECK-NEXT: [[TMP3:%.*]] = add i32 [[INDEX]], 0 634; CHECK-NEXT: [[TMP4:%.*]] = sext i32 [[TMP3]] to i64 635; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i16, i16* [[P:%.*]], i64 [[TMP4]] 636; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i16, i16* [[TMP5]], i32 0 637; CHECK-NEXT: [[TMP7:%.*]] = bitcast i16* [[TMP6]] to <4 x i16>* 638; CHECK-NEXT: [[WIDE_LOAD]] = load <4 x i16>, <4 x i16>* [[TMP7]], align 2 639; CHECK-NEXT: [[TMP8:%.*]] = shufflevector <4 x i16> [[VECTOR_RECUR]], <4 x i16> [[WIDE_LOAD]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 640; CHECK-NEXT: [[TMP9:%.*]] = bitcast i16* [[TMP6]] to <4 x i16>* 641; CHECK-NEXT: store <4 x i16> [[TMP8]], <4 x i16>* [[TMP9]], align 4 642; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4 643; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], <i32 4, i32 4, i32 4, i32 4> 644; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]] 645; CHECK-NEXT: br i1 [[TMP10]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP8:![0-9]+]] 646; CHECK: middle.block: 647; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x i16> [[WIDE_LOAD]], i32 3 648; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x i16> [[WIDE_LOAD]], i32 2 649; CHECK-NEXT: br label [[SCALAR_PH]] 650; CHECK: scalar.ph: 651; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 652; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ] 653; CHECK-NEXT: br label [[FOR_COND:%.*]] 654; CHECK: for.cond: 655; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ] 656; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i16 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[REC_NEXT:%.*]], [[FOR_BODY]] ] 657; CHECK-NEXT: [[IPROM:%.*]] = sext i32 [[I]] to i64 658; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]], i64 [[IPROM]] 659; CHECK-NEXT: [[REC_NEXT]] = load i16, i16* [[B]], align 2 660; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]] 661; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]] 662; CHECK: for.body: 663; CHECK-NEXT: store i16 [[SCALAR_RECUR]], i16* [[B]], align 4 664; CHECK-NEXT: [[INC]] = add nsw i32 [[I]], 1 665; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 [[I]], 2096 666; CHECK-NEXT: br i1 [[CMP2]], label [[FOR_COND]], label [[IF_END]], !llvm.loop [[LOOP9:![0-9]+]] 667; CHECK: if.end: 668; CHECK-NEXT: [[REC_LCSSA:%.*]] = phi i16 [ [[SCALAR_RECUR]], [[FOR_BODY]] ], [ [[SCALAR_RECUR]], [[FOR_COND]] ] 669; CHECK-NEXT: ret i16 [[REC_LCSSA]] 670; 671entry: 672 br label %for.cond 673 674for.cond: 675 %i = phi i32 [ 0, %entry ], [ %inc, %for.body ] 676 %rec = phi i16 [0, %entry], [ %rec.next, %for.body ] 677 %iprom = sext i32 %i to i64 678 %b = getelementptr inbounds i16, i16* %p, i64 %iprom 679 %rec.next = load i16, i16* %b 680 %cmp = icmp slt i32 %i, %n 681 br i1 %cmp, label %for.body, label %if.end 682 683for.body: 684 store i16 %rec , i16* %b, align 4 685 %inc = add nsw i32 %i, 1 686 %cmp2 = icmp slt i32 %i, 2096 687 br i1 %cmp2, label %for.cond, label %if.end 688 689if.end: 690 ret i16 %rec 691} 692 693 694; A multiple exit case where one of the exiting edges involves a value 695; from the recurrence and one does not. 696define i16 @multiple_exit2(i16* %p, i32 %n) { 697; CHECK-LABEL: @multiple_exit2( 698; CHECK-NEXT: entry: 699; CHECK-NEXT: [[SMAX:%.*]] = call i32 @llvm.smax.i32(i32 [[N:%.*]], i32 0) 700; CHECK-NEXT: [[UMIN:%.*]] = call i32 @llvm.umin.i32(i32 [[SMAX]], i32 2096) 701; CHECK-NEXT: [[TMP0:%.*]] = add nuw nsw i32 [[UMIN]], 1 702; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ule i32 [[TMP0]], 4 703; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]] 704; CHECK: vector.ph: 705; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[TMP0]], 4 706; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[N_MOD_VF]], 0 707; CHECK-NEXT: [[TMP2:%.*]] = select i1 [[TMP1]], i32 4, i32 [[N_MOD_VF]] 708; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[TMP0]], [[TMP2]] 709; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 710; CHECK: vector.body: 711; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 712; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[VECTOR_BODY]] ] 713; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i16> [ <i16 poison, i16 poison, i16 poison, i16 0>, [[VECTOR_PH]] ], [ [[WIDE_LOAD:%.*]], [[VECTOR_BODY]] ] 714; CHECK-NEXT: [[TMP3:%.*]] = add i32 [[INDEX]], 0 715; CHECK-NEXT: [[TMP4:%.*]] = sext i32 [[TMP3]] to i64 716; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i16, i16* [[P:%.*]], i64 [[TMP4]] 717; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i16, i16* [[TMP5]], i32 0 718; CHECK-NEXT: [[TMP7:%.*]] = bitcast i16* [[TMP6]] to <4 x i16>* 719; CHECK-NEXT: [[WIDE_LOAD]] = load <4 x i16>, <4 x i16>* [[TMP7]], align 2 720; CHECK-NEXT: [[TMP8:%.*]] = shufflevector <4 x i16> [[VECTOR_RECUR]], <4 x i16> [[WIDE_LOAD]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 721; CHECK-NEXT: [[TMP9:%.*]] = bitcast i16* [[TMP6]] to <4 x i16>* 722; CHECK-NEXT: store <4 x i16> [[TMP8]], <4 x i16>* [[TMP9]], align 4 723; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4 724; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], <i32 4, i32 4, i32 4, i32 4> 725; CHECK-NEXT: [[TMP10:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]] 726; CHECK-NEXT: br i1 [[TMP10]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]] 727; CHECK: middle.block: 728; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x i16> [[WIDE_LOAD]], i32 3 729; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x i16> [[WIDE_LOAD]], i32 2 730; CHECK-NEXT: br label [[SCALAR_PH]] 731; CHECK: scalar.ph: 732; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 733; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ] 734; CHECK-NEXT: br label [[FOR_COND:%.*]] 735; CHECK: for.cond: 736; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INC:%.*]], [[FOR_BODY:%.*]] ] 737; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i16 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[REC_NEXT:%.*]], [[FOR_BODY]] ] 738; CHECK-NEXT: [[IPROM:%.*]] = sext i32 [[I]] to i64 739; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds i16, i16* [[P]], i64 [[IPROM]] 740; CHECK-NEXT: [[REC_NEXT]] = load i16, i16* [[B]], align 2 741; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[I]], [[N]] 742; CHECK-NEXT: br i1 [[CMP]], label [[FOR_BODY]], label [[IF_END:%.*]] 743; CHECK: for.body: 744; CHECK-NEXT: store i16 [[SCALAR_RECUR]], i16* [[B]], align 4 745; CHECK-NEXT: [[INC]] = add nsw i32 [[I]], 1 746; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i32 [[I]], 2096 747; CHECK-NEXT: br i1 [[CMP2]], label [[FOR_COND]], label [[IF_END]], !llvm.loop [[LOOP11:![0-9]+]] 748; CHECK: if.end: 749; CHECK-NEXT: [[REC_LCSSA:%.*]] = phi i16 [ [[SCALAR_RECUR]], [[FOR_COND]] ], [ 10, [[FOR_BODY]] ] 750; CHECK-NEXT: ret i16 [[REC_LCSSA]] 751; 752entry: 753 br label %for.cond 754 755for.cond: 756 %i = phi i32 [ 0, %entry ], [ %inc, %for.body ] 757 %rec = phi i16 [0, %entry], [ %rec.next, %for.body ] 758 %iprom = sext i32 %i to i64 759 %b = getelementptr inbounds i16, i16* %p, i64 %iprom 760 %rec.next = load i16, i16* %b 761 %cmp = icmp slt i32 %i, %n 762 br i1 %cmp, label %for.body, label %if.end 763 764for.body: 765 store i16 %rec , i16* %b, align 4 766 %inc = add nsw i32 %i, 1 767 %cmp2 = icmp slt i32 %i, 2096 768 br i1 %cmp2, label %for.cond, label %if.end 769 770if.end: 771 %rec.lcssa = phi i16 [ %rec, %for.cond ], [ 10, %for.body ] 772 ret i16 %rec.lcssa 773} 774 775; A test where the instructions to sink may not be visited in dominance order. 776define void @sink_dominance(i32* %ptr, i32 %N) { 777; CHECK-LABEL: @sink_dominance( 778; CHECK-NEXT: entry: 779; CHECK-NEXT: [[UMAX1:%.*]] = call i32 @llvm.umax.i32(i32 [[N:%.*]], i32 1) 780; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[UMAX1]], 4 781; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]] 782; CHECK: vector.scevcheck: 783; CHECK-NEXT: [[UMAX:%.*]] = call i32 @llvm.umax.i32(i32 [[N]], i32 1) 784; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[UMAX]], -1 785; CHECK-NEXT: [[TMP4:%.*]] = icmp slt i32 [[TMP0]], 0 786; CHECK-NEXT: br i1 [[TMP4]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]] 787; CHECK: vector.ph: 788; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[UMAX1]], 4 789; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[UMAX1]], [[N_MOD_VF]] 790; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 791; CHECK: vector.body: 792; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 793; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i64> [ <i64 poison, i64 poison, i64 poison, i64 0>, [[VECTOR_PH]] ], [ [[TMP11:%.*]], [[VECTOR_BODY]] ] 794; CHECK-NEXT: [[TMP7:%.*]] = add i32 [[INDEX]], 0 795; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, i32* [[PTR:%.*]], i32 [[TMP7]] 796; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, i32* [[TMP8]], i32 0 797; CHECK-NEXT: [[TMP10:%.*]] = bitcast i32* [[TMP9]] to <4 x i32>* 798; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, <4 x i32>* [[TMP10]], align 4 799; CHECK-NEXT: [[TMP11]] = zext <4 x i32> [[WIDE_LOAD]] to <4 x i64> 800; CHECK-NEXT: [[TMP12:%.*]] = shufflevector <4 x i64> [[VECTOR_RECUR]], <4 x i64> [[TMP11]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 801; CHECK-NEXT: [[TMP13:%.*]] = trunc <4 x i64> [[TMP12]] to <4 x i32> 802; CHECK-NEXT: [[TMP14:%.*]] = icmp slt <4 x i32> [[TMP13]], <i32 213, i32 213, i32 213, i32 213> 803; CHECK-NEXT: [[TMP15:%.*]] = select <4 x i1> [[TMP14]], <4 x i32> [[TMP13]], <4 x i32> <i32 22, i32 22, i32 22, i32 22> 804; CHECK-NEXT: [[TMP16:%.*]] = bitcast i32* [[TMP9]] to <4 x i32>* 805; CHECK-NEXT: store <4 x i32> [[TMP15]], <4 x i32>* [[TMP16]], align 4 806; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4 807; CHECK-NEXT: [[TMP17:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]] 808; CHECK-NEXT: br i1 [[TMP17]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP12:![0-9]+]] 809; CHECK: middle.block: 810; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[UMAX1]], [[N_VEC]] 811; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x i64> [[TMP11]], i32 3 812; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x i64> [[TMP11]], i32 2 813; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]] 814; CHECK: scalar.ph: 815; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i64 [ 0, [[VECTOR_SCEVCHECK]] ], [ 0, [[ENTRY:%.*]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 816; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ], [ 0, [[VECTOR_SCEVCHECK]] ] 817; CHECK-NEXT: br label [[LOOP:%.*]] 818; CHECK: loop: 819; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i64 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[FOR_NEXT:%.*]], [[LOOP]] ] 820; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] 821; CHECK-NEXT: [[FOR_TRUNC:%.*]] = trunc i64 [[SCALAR_RECUR]] to i32 822; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[FOR_TRUNC]], 213 823; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[CMP]], i32 [[FOR_TRUNC]], i32 22 824; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[PTR]], i32 [[IV]] 825; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[GEP]], align 4 826; CHECK-NEXT: [[FOR_NEXT]] = zext i32 [[LV]] to i64 827; CHECK-NEXT: store i32 [[SELECT]], i32* [[GEP]], align 4 828; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1 829; CHECK-NEXT: [[CMP73:%.*]] = icmp ugt i32 [[N]], [[IV_NEXT]] 830; CHECK-NEXT: br i1 [[CMP73]], label [[LOOP]], label [[EXIT]], !llvm.loop [[LOOP13:![0-9]+]] 831; CHECK: exit: 832; CHECK-NEXT: ret void 833; 834entry: 835 br label %loop 836 837loop: 838 %for = phi i64 [ 0, %entry ], [ %for.next, %loop ] 839 %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ] 840 841 %for.trunc = trunc i64 %for to i32 842 %cmp = icmp slt i32 %for.trunc, 213 843 %select = select i1 %cmp, i32 %for.trunc, i32 22 844 845 %gep = getelementptr inbounds i32, i32* %ptr, i32 %iv 846 %lv = load i32, i32* %gep, align 4 847 %for.next = zext i32 %lv to i64 848 store i32 %select, i32* %gep 849 850 %iv.next = add i32 %iv, 1 851 %cmp73 = icmp ugt i32 %N, %iv.next 852 br i1 %cmp73, label %loop, label %exit 853 854exit: 855 ret void 856} 857 858; Similar to @sink_dominance, but with 2 separate chains that merge at %select 859; with a different number of instructions in between. 860define void @sink_dominance_2(i32* %ptr, i32 %N) { 861; CHECK-LABEL: @sink_dominance_2( 862; CHECK-NEXT: entry: 863; CHECK-NEXT: [[UMAX1:%.*]] = call i32 @llvm.umax.i32(i32 [[N:%.*]], i32 1) 864; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[UMAX1]], 4 865; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[VECTOR_SCEVCHECK:%.*]] 866; CHECK: vector.scevcheck: 867; CHECK-NEXT: [[UMAX:%.*]] = call i32 @llvm.umax.i32(i32 [[N]], i32 1) 868; CHECK-NEXT: [[TMP0:%.*]] = add i32 [[UMAX]], -1 869; CHECK-NEXT: [[TMP4:%.*]] = icmp slt i32 [[TMP0]], 0 870; CHECK-NEXT: br i1 [[TMP4]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]] 871; CHECK: vector.ph: 872; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i32 [[UMAX1]], 4 873; CHECK-NEXT: [[N_VEC:%.*]] = sub i32 [[UMAX1]], [[N_MOD_VF]] 874; CHECK-NEXT: br label [[VECTOR_BODY:%.*]] 875; CHECK: vector.body: 876; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ] 877; CHECK-NEXT: [[VECTOR_RECUR:%.*]] = phi <4 x i64> [ <i64 poison, i64 poison, i64 poison, i64 0>, [[VECTOR_PH]] ], [ [[TMP11:%.*]], [[VECTOR_BODY]] ] 878; CHECK-NEXT: [[TMP7:%.*]] = add i32 [[INDEX]], 0 879; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds i32, i32* [[PTR:%.*]], i32 [[TMP7]] 880; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds i32, i32* [[TMP8]], i32 0 881; CHECK-NEXT: [[TMP10:%.*]] = bitcast i32* [[TMP9]] to <4 x i32>* 882; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, <4 x i32>* [[TMP10]], align 4 883; CHECK-NEXT: [[TMP11]] = zext <4 x i32> [[WIDE_LOAD]] to <4 x i64> 884; CHECK-NEXT: [[TMP12:%.*]] = shufflevector <4 x i64> [[VECTOR_RECUR]], <4 x i64> [[TMP11]], <4 x i32> <i32 3, i32 4, i32 5, i32 6> 885; CHECK-NEXT: [[TMP13:%.*]] = trunc <4 x i64> [[TMP12]] to <4 x i32> 886; CHECK-NEXT: [[TMP14:%.*]] = add <4 x i32> [[TMP13]], <i32 2, i32 2, i32 2, i32 2> 887; CHECK-NEXT: [[TMP15:%.*]] = mul <4 x i32> [[TMP14]], <i32 99, i32 99, i32 99, i32 99> 888; CHECK-NEXT: [[TMP16:%.*]] = icmp slt <4 x i32> [[TMP13]], <i32 213, i32 213, i32 213, i32 213> 889; CHECK-NEXT: [[TMP17:%.*]] = select <4 x i1> [[TMP16]], <4 x i32> [[TMP13]], <4 x i32> [[TMP15]] 890; CHECK-NEXT: [[TMP18:%.*]] = bitcast i32* [[TMP9]] to <4 x i32>* 891; CHECK-NEXT: store <4 x i32> [[TMP17]], <4 x i32>* [[TMP18]], align 4 892; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4 893; CHECK-NEXT: [[TMP19:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]] 894; CHECK-NEXT: br i1 [[TMP19]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP14:![0-9]+]] 895; CHECK: middle.block: 896; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i32 [[UMAX1]], [[N_VEC]] 897; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT:%.*]] = extractelement <4 x i64> [[TMP11]], i32 3 898; CHECK-NEXT: [[VECTOR_RECUR_EXTRACT_FOR_PHI:%.*]] = extractelement <4 x i64> [[TMP11]], i32 2 899; CHECK-NEXT: br i1 [[CMP_N]], label [[EXIT:%.*]], label [[SCALAR_PH]] 900; CHECK: scalar.ph: 901; CHECK-NEXT: [[SCALAR_RECUR_INIT:%.*]] = phi i64 [ 0, [[VECTOR_SCEVCHECK]] ], [ 0, [[ENTRY:%.*]] ], [ [[VECTOR_RECUR_EXTRACT]], [[MIDDLE_BLOCK]] ] 902; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i32 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[ENTRY]] ], [ 0, [[VECTOR_SCEVCHECK]] ] 903; CHECK-NEXT: br label [[LOOP:%.*]] 904; CHECK: loop: 905; CHECK-NEXT: [[SCALAR_RECUR:%.*]] = phi i64 [ [[SCALAR_RECUR_INIT]], [[SCALAR_PH]] ], [ [[FOR_NEXT:%.*]], [[LOOP]] ] 906; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] 907; CHECK-NEXT: [[FOR_TRUNC:%.*]] = trunc i64 [[SCALAR_RECUR]] to i32 908; CHECK-NEXT: [[STEP:%.*]] = add i32 [[FOR_TRUNC]], 2 909; CHECK-NEXT: [[STEP_2:%.*]] = mul i32 [[STEP]], 99 910; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[FOR_TRUNC]], 213 911; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[CMP]], i32 [[FOR_TRUNC]], i32 [[STEP_2]] 912; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i32, i32* [[PTR]], i32 [[IV]] 913; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[GEP]], align 4 914; CHECK-NEXT: [[FOR_NEXT]] = zext i32 [[LV]] to i64 915; CHECK-NEXT: store i32 [[SELECT]], i32* [[GEP]], align 4 916; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1 917; CHECK-NEXT: [[CMP73:%.*]] = icmp ugt i32 [[N]], [[IV_NEXT]] 918; CHECK-NEXT: br i1 [[CMP73]], label [[LOOP]], label [[EXIT]], !llvm.loop [[LOOP15:![0-9]+]] 919; CHECK: exit: 920; CHECK-NEXT: ret void 921; 922entry: 923 br label %loop 924 925loop: 926 %for = phi i64 [ 0, %entry ], [ %for.next, %loop ] 927 %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ] 928 929 %for.trunc = trunc i64 %for to i32 930 %step = add i32 %for.trunc, 2 931 %step.2 = mul i32 %step, 99 932 933 %cmp = icmp slt i32 %for.trunc, 213 934 %select = select i1 %cmp, i32 %for.trunc, i32 %step.2 935 936 %gep = getelementptr inbounds i32, i32* %ptr, i32 %iv 937 %lv = load i32, i32* %gep, align 4 938 %for.next = zext i32 %lv to i64 939 store i32 %select, i32* %gep 940 941 %iv.next = add i32 %iv, 1 942 %cmp73 = icmp ugt i32 %N, %iv.next 943 br i1 %cmp73, label %loop, label %exit 944 945exit: 946 ret void 947} 948 949define void @cannot_sink_load_past_store(i32* %ptr, i32 %N) { 950; CHECK-LABEL: @cannot_sink_load_past_store( 951; CHECK-NEXT: entry: 952; CHECK-NEXT: br label [[LOOP:%.*]] 953; CHECK: loop: 954; CHECK-NEXT: [[FOR:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[FOR_NEXT:%.*]], [[LOOP]] ] 955; CHECK-NEXT: [[IV:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[IV_NEXT:%.*]], [[LOOP]] ] 956; CHECK-NEXT: [[GEP_FOR:%.*]] = getelementptr inbounds i32, i32* [[PTR:%.*]], i64 [[FOR]] 957; CHECK-NEXT: [[LV_FOR:%.*]] = load i32, i32* [[GEP_FOR]], align 4 958; CHECK-NEXT: [[FOR_TRUNC:%.*]] = trunc i64 [[FOR]] to i32 959; CHECK-NEXT: [[CMP:%.*]] = icmp slt i32 [[LV_FOR]], [[FOR_TRUNC]] 960; CHECK-NEXT: [[SELECT:%.*]] = select i1 [[CMP]], i32 [[LV_FOR]], i32 22 961; CHECK-NEXT: [[GEP_IV:%.*]] = getelementptr inbounds i32, i32* [[PTR]], i32 [[IV]] 962; CHECK-NEXT: store i32 0, i32* [[GEP_IV]], align 4 963; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1 964; CHECK-NEXT: [[FOR_NEXT]] = zext i32 [[IV]] to i64 965; CHECK-NEXT: [[CMP73:%.*]] = icmp ugt i32 [[N:%.*]], [[IV_NEXT]] 966; CHECK-NEXT: br i1 [[CMP73]], label [[LOOP]], label [[EXIT:%.*]] 967; CHECK: exit: 968; CHECK-NEXT: ret void 969; 970entry: 971 br label %loop 972 973loop: 974 %for = phi i64 [ 0, %entry ], [ %for.next, %loop ] 975 %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ] 976 977 %gep.for = getelementptr inbounds i32, i32* %ptr, i64 %for 978 %lv.for = load i32, i32* %gep.for, align 4 979 %for.trunc = trunc i64 %for to i32 980 %cmp = icmp slt i32 %lv.for, %for.trunc 981 %select = select i1 %cmp, i32 %lv.for, i32 22 982 983 %gep.iv = getelementptr inbounds i32, i32* %ptr, i32 %iv 984 store i32 0, i32* %gep.iv 985 %iv.next = add i32 %iv, 1 986 %for.next = zext i32 %iv to i64 987 988 %cmp73 = icmp ugt i32 %N, %iv.next 989 br i1 %cmp73, label %loop, label %exit 990 991exit: 992 ret void 993} 994 995define void @test_for_sink_instruction_after_same_incoming_1(double* %ptr) { 996; CHECK-LABEL: @test_for_sink_instruction_after_same_incoming_1 997; CHECK-NOT: vector.body: 998; 999entry: 1000 br label %loop 1001 1002loop: 1003 %for.1 = phi double [ 10.0, %entry ], [ %for.1.next, %loop ] 1004 %for.2 = phi double [ 20.0, %entry ], [ %for.1.next, %loop ] 1005 %iv = phi i64 [ 1, %entry ], [ %iv.next, %loop ] 1006 %add.1 = fadd double 10.0, %for.2 1007 %add.2 = fadd double %add.1, %for.1 1008 %iv.next = add nuw nsw i64 %iv, 1 1009 %gep.ptr = getelementptr inbounds double, double* %ptr, i64 %iv 1010 %for.1.next = load double, double* %gep.ptr, align 8 1011 store double %add.2, double* %gep.ptr 1012 %exitcond.not = icmp eq i64 %iv.next, 1000 1013 br i1 %exitcond.not, label %exit, label %loop 1014 1015exit: 1016 ret void 1017} 1018 1019 1020define void @test_for_sink_instruction_after_same_incoming_2(double* %ptr) { 1021; CHECK-LABEL: @test_for_sink_instruction_after_same_incoming_2 1022; CHECK-NOT: vector.body: 1023entry: 1024 br label %loop 1025 1026loop: 1027 %for.2 = phi double [ 20.0, %entry ], [ %for.1.next, %loop ] 1028 %for.1 = phi double [ 10.0, %entry ], [ %for.1.next, %loop ] 1029 %iv = phi i64 [ 1, %entry ], [ %iv.next, %loop ] 1030 %add.1 = fadd double 10.0, %for.2 1031 %add.2 = fadd double %add.1, %for.1 1032 %iv.next = add nuw nsw i64 %iv, 1 1033 %gep.ptr = getelementptr inbounds double, double* %ptr, i64 %iv 1034 %for.1.next = load double, double* %gep.ptr, align 8 1035 store double %add.2, double* %gep.ptr 1036 %exitcond.not = icmp eq i64 %iv.next, 1000 1037 br i1 %exitcond.not, label %exit, label %loop 1038 1039exit: 1040 ret void 1041} 1042