1; Test loop tuning. 2; 3; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s 4; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 \ 5; RUN: | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK-Z13 6 7; Test that strength reduction is applied to addresses with a scale factor, 8; but that indexed addressing can still be used. 9define void @f1(i32 *%dest, i32 %a) { 10; CHECK-LABEL: f1: 11; CHECK-NOT: sllg 12; CHECK: st %r3, 0({{%r[1-5],%r[1-5]}}) 13; CHECK: br %r14 14entry: 15 br label %loop 16 17loop: 18 %index = phi i64 [ 0, %entry ], [ %next, %loop ] 19 %ptr = getelementptr i32, i32 *%dest, i64 %index 20 store i32 %a, i32 *%ptr 21 %next = add i64 %index, 1 22 %cmp = icmp ne i64 %next, 100 23 br i1 %cmp, label %loop, label %exit 24 25exit: 26 ret void 27} 28 29; Test a loop that should be converted into dbr form and then use BRCT. 30define void @f2(i32 *%src, i32 *%dest) { 31; CHECK-LABEL: f2: 32; CHECK: lhi [[REG:%r[0-5]]], 100 33; CHECK: [[LABEL:\.[^:]*]]:{{.*}} %loop 34; CHECK: brct [[REG]], [[LABEL]] 35; CHECK: br %r14 36entry: 37 br label %loop 38 39loop: 40 %count = phi i32 [ 0, %entry ], [ %next, %loop.next ] 41 %next = add i32 %count, 1 42 %val = load volatile i32 , i32 *%src 43 %cmp = icmp eq i32 %val, 0 44 br i1 %cmp, label %loop.next, label %loop.store 45 46loop.store: 47 %add = add i32 %val, 1 48 store volatile i32 %add, i32 *%dest 49 br label %loop.next 50 51loop.next: 52 %cont = icmp ne i32 %next, 100 53 br i1 %cont, label %loop, label %exit 54 55exit: 56 ret void 57} 58 59; Like f2, but for BRCTG. 60define void @f3(i64 *%src, i64 *%dest) { 61; CHECK-LABEL: f3: 62; CHECK: lghi [[REG:%r[0-5]]], 100 63; CHECK: [[LABEL:\.[^:]*]]:{{.*}} %loop 64; CHECK: brctg [[REG]], [[LABEL]] 65; CHECK: br %r14 66entry: 67 br label %loop 68 69loop: 70 %count = phi i64 [ 0, %entry ], [ %next, %loop.next ] 71 %next = add i64 %count, 1 72 %val = load volatile i64 , i64 *%src 73 %cmp = icmp eq i64 %val, 0 74 br i1 %cmp, label %loop.next, label %loop.store 75 76loop.store: 77 %add = add i64 %val, 1 78 store volatile i64 %add, i64 *%dest 79 br label %loop.next 80 81loop.next: 82 %cont = icmp ne i64 %next, 100 83 br i1 %cont, label %loop, label %exit 84 85exit: 86 ret void 87} 88 89; Test a loop with a 64-bit decremented counter in which the 32-bit 90; low part of the counter is used after the decrement. This is an example 91; of a subregister use being the only thing that blocks a conversion to BRCTG. 92define void @f4(i32 *%src, i32 *%dest, i64 *%dest2, i64 %count) { 93; CHECK-LABEL: f4: 94; CHECK: aghi [[REG:%r[0-5]]], -1 95; CHECK: lr [[REG2:%r[0-5]]], [[REG]] 96; CHECK: stg [[REG2]], 97; CHECK: jne {{\..*}} 98; CHECK: br %r14 99entry: 100 br label %loop 101 102loop: 103 %left = phi i64 [ %count, %entry ], [ %next, %loop.next ] 104 store volatile i64 %left, i64 *%dest2 105 %val = load volatile i32 , i32 *%src 106 %cmp = icmp eq i32 %val, 0 107 br i1 %cmp, label %loop.next, label %loop.store 108 109loop.store: 110 %add = add i32 %val, 1 111 store volatile i32 %add, i32 *%dest 112 br label %loop.next 113 114loop.next: 115 %next = add i64 %left, -1 116 %ext = zext i32 %val to i64 117 %shl = shl i64 %ext, 32 118 %and = and i64 %next, 4294967295 119 %or = or i64 %shl, %and 120 store volatile i64 %or, i64 *%dest2 121 %cont = icmp ne i64 %next, 0 122 br i1 %cont, label %loop, label %exit 123 124exit: 125 ret void 126} 127 128; Test that negative offsets are avoided for loads of floating point. 129%s.float = type { float, float, float } 130define void @f5(%s.float* nocapture %a, 131 %s.float* nocapture readonly %b, 132 i32 zeroext %S) { 133; CHECK-Z13-LABEL: f5: 134; CHECK-Z13-NOT: -{{[0-9]+}}(%r 135 136entry: 137 %cmp9 = icmp eq i32 %S, 0 138 br i1 %cmp9, label %for.cond.cleanup, label %for.body.preheader 139 140for.body.preheader: ; preds = %entry 141 br label %for.body 142 143for.cond.cleanup.loopexit: ; preds = %for.body 144 br label %for.cond.cleanup 145 146for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry 147 ret void 148 149for.body: ; preds = %for.body.preheader, %for.body 150 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ] 151 %a1 = getelementptr inbounds %s.float, %s.float* %b, i64 %indvars.iv, i32 0 152 %tmp = load float, float* %a1, align 4 153 %b4 = getelementptr inbounds %s.float, %s.float* %b, i64 %indvars.iv, i32 1 154 %tmp1 = load float, float* %b4, align 4 155 %add = fadd float %tmp, %tmp1 156 %c = getelementptr inbounds %s.float, %s.float* %b, i64 %indvars.iv, i32 2 157 %tmp2 = load float, float* %c, align 4 158 %add7 = fadd float %add, %tmp2 159 %a10 = getelementptr inbounds %s.float, %s.float* %a, i64 %indvars.iv, i32 0 160 store float %add7, float* %a10, align 4 161 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 162 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 163 %exitcond = icmp eq i32 %lftr.wideiv, %S 164 br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body 165} 166 167; Test that negative offsets are avoided for loads of double. 168%s.double = type { double, double, double } 169define void @f6(%s.double* nocapture %a, 170 %s.double* nocapture readonly %b, 171 i32 zeroext %S) { 172; CHECK-Z13-LABEL: f6: 173; CHECK-Z13-NOT: -{{[0-9]+}}(%r 174entry: 175 %cmp9 = icmp eq i32 %S, 0 176 br i1 %cmp9, label %for.cond.cleanup, label %for.body.preheader 177 178for.body.preheader: ; preds = %entry 179 br label %for.body 180 181for.cond.cleanup.loopexit: ; preds = %for.body 182 br label %for.cond.cleanup 183 184for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry 185 ret void 186 187for.body: ; preds = %for.body.preheader, %for.body 188 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ] 189 %a1 = getelementptr inbounds %s.double, %s.double* %b, i64 %indvars.iv, i32 0 190 %tmp = load double, double* %a1, align 4 191 %b4 = getelementptr inbounds %s.double, %s.double* %b, i64 %indvars.iv, i32 1 192 %tmp1 = load double, double* %b4, align 4 193 %add = fadd double %tmp, %tmp1 194 %c = getelementptr inbounds %s.double, %s.double* %b, i64 %indvars.iv, i32 2 195 %tmp2 = load double, double* %c, align 4 196 %add7 = fadd double %add, %tmp2 197 %a10 = getelementptr inbounds %s.double, %s.double* %a, i64 %indvars.iv, i32 0 198 store double %add7, double* %a10, align 4 199 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 200 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 201 %exitcond = icmp eq i32 %lftr.wideiv, %S 202 br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body 203} 204 205; Test that negative offsets are avoided for memory accesses of vector type. 206%s.vec = type { <4 x i32>, <4 x i32>, <4 x i32> } 207define void @f7(%s.vec* nocapture %a, 208 %s.vec* nocapture readonly %b, 209 i32 zeroext %S) { 210; CHECK-Z13-LABEL: f7: 211; CHECK-Z13-NOT: -{{[0-9]+}}(%r 212entry: 213 %cmp9 = icmp eq i32 %S, 0 214 br i1 %cmp9, label %for.cond.cleanup, label %for.body.preheader 215 216for.body.preheader: ; preds = %entry 217 br label %for.body 218 219for.cond.cleanup.loopexit: ; preds = %for.body 220 br label %for.cond.cleanup 221 222for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry 223 ret void 224 225for.body: ; preds = %for.body.preheader, %for.body 226 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ] 227 %a1 = getelementptr inbounds %s.vec, %s.vec* %b, i64 %indvars.iv, i32 0 228 %tmp = load <4 x i32>, <4 x i32>* %a1, align 4 229 %b4 = getelementptr inbounds %s.vec, %s.vec* %b, i64 %indvars.iv, i32 1 230 %tmp1 = load <4 x i32>, <4 x i32>* %b4, align 4 231 %add = add <4 x i32> %tmp1, %tmp 232 %c = getelementptr inbounds %s.vec, %s.vec* %b, i64 %indvars.iv, i32 2 233 %tmp2 = load <4 x i32>, <4 x i32>* %c, align 4 234 %add7 = add <4 x i32> %add, %tmp2 235 %a10 = getelementptr inbounds %s.vec, %s.vec* %a, i64 %indvars.iv, i32 0 236 store <4 x i32> %add7, <4 x i32>* %a10, align 4 237 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 238 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 239 %exitcond = icmp eq i32 %lftr.wideiv, %S 240 br i1 %exitcond, label %for.cond.cleanup.loopexit, label %for.body 241} 242