1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -passes='default<O3>' -S | FileCheck %s
3
4; This test after a lot of cleanup should produce pick a tail-predicated 8x
5; vector loop. The 8x will be more profitable, to pick a VQDMULH.s16 instruction.
6; FIXME: Tailpredicate too, but not at the expense of 8x vectorized.
7
8target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
9target triple = "thumbv8.1m.main-arm-none-eabi"
10
11define void @arm_mult_q15(i16* %pSrcA, i16* %pSrcB, i16 * noalias %pDst, i32 %blockSize) #0 {
12; CHECK-LABEL: @arm_mult_q15(
13; CHECK-NEXT:  entry:
14; CHECK-NEXT:    [[CMP_NOT3:%.*]] = icmp eq i32 [[BLOCKSIZE:%.*]], 0
15; CHECK-NEXT:    br i1 [[CMP_NOT3]], label [[WHILE_END:%.*]], label [[WHILE_BODY_PREHEADER:%.*]]
16; CHECK:       while.body.preheader:
17; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i32 [[BLOCKSIZE]], 8
18; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[WHILE_BODY_PREHEADER17:%.*]], label [[VECTOR_PH:%.*]]
19; CHECK:       vector.ph:
20; CHECK-NEXT:    [[N_VEC:%.*]] = and i32 [[BLOCKSIZE]], -8
21; CHECK-NEXT:    [[IND_END:%.*]] = and i32 [[BLOCKSIZE]], 7
22; CHECK-NEXT:    [[IND_END8:%.*]] = getelementptr i16, i16* [[PSRCA:%.*]], i32 [[N_VEC]]
23; CHECK-NEXT:    [[IND_END10:%.*]] = getelementptr i16, i16* [[PDST:%.*]], i32 [[N_VEC]]
24; CHECK-NEXT:    [[IND_END12:%.*]] = getelementptr i16, i16* [[PSRCB:%.*]], i32 [[N_VEC]]
25; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
26; CHECK:       vector.body:
27; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
28; CHECK-NEXT:    [[NEXT_GEP:%.*]] = getelementptr i16, i16* [[PSRCA]], i32 [[INDEX]]
29; CHECK-NEXT:    [[NEXT_GEP14:%.*]] = getelementptr i16, i16* [[PDST]], i32 [[INDEX]]
30; CHECK-NEXT:    [[NEXT_GEP15:%.*]] = getelementptr i16, i16* [[PSRCB]], i32 [[INDEX]]
31; CHECK-NEXT:    [[TMP0:%.*]] = bitcast i16* [[NEXT_GEP]] to <8 x i16>*
32; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <8 x i16>, <8 x i16>* [[TMP0]], align 2
33; CHECK-NEXT:    [[TMP1:%.*]] = sext <8 x i16> [[WIDE_LOAD]] to <8 x i32>
34; CHECK-NEXT:    [[TMP2:%.*]] = bitcast i16* [[NEXT_GEP15]] to <8 x i16>*
35; CHECK-NEXT:    [[WIDE_LOAD16:%.*]] = load <8 x i16>, <8 x i16>* [[TMP2]], align 2
36; CHECK-NEXT:    [[TMP3:%.*]] = sext <8 x i16> [[WIDE_LOAD16]] to <8 x i32>
37; CHECK-NEXT:    [[TMP4:%.*]] = mul nsw <8 x i32> [[TMP3]], [[TMP1]]
38; CHECK-NEXT:    [[TMP5:%.*]] = ashr <8 x i32> [[TMP4]], <i32 15, i32 15, i32 15, i32 15, i32 15, i32 15, i32 15, i32 15>
39; CHECK-NEXT:    [[TMP6:%.*]] = call <8 x i32> @llvm.smin.v8i32(<8 x i32> [[TMP5]], <8 x i32> <i32 32767, i32 32767, i32 32767, i32 32767, i32 32767, i32 32767, i32 32767, i32 32767>)
40; CHECK-NEXT:    [[TMP7:%.*]] = trunc <8 x i32> [[TMP6]] to <8 x i16>
41; CHECK-NEXT:    [[TMP8:%.*]] = bitcast i16* [[NEXT_GEP14]] to <8 x i16>*
42; CHECK-NEXT:    store <8 x i16> [[TMP7]], <8 x i16>* [[TMP8]], align 2
43; CHECK-NEXT:    [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 8
44; CHECK-NEXT:    [[TMP9:%.*]] = icmp eq i32 [[INDEX_NEXT]], [[N_VEC]]
45; CHECK-NEXT:    br i1 [[TMP9]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
46; CHECK:       middle.block:
47; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[N_VEC]], [[BLOCKSIZE]]
48; CHECK-NEXT:    br i1 [[CMP_N]], label [[WHILE_END]], label [[WHILE_BODY_PREHEADER17]]
49; CHECK:       while.body.preheader17:
50; CHECK-NEXT:    [[BLKCNT_07_PH:%.*]] = phi i32 [ [[BLOCKSIZE]], [[WHILE_BODY_PREHEADER]] ], [ [[IND_END]], [[MIDDLE_BLOCK]] ]
51; CHECK-NEXT:    [[PSRCA_ADDR_06_PH:%.*]] = phi i16* [ [[PSRCA]], [[WHILE_BODY_PREHEADER]] ], [ [[IND_END8]], [[MIDDLE_BLOCK]] ]
52; CHECK-NEXT:    [[PDST_ADDR_05_PH:%.*]] = phi i16* [ [[PDST]], [[WHILE_BODY_PREHEADER]] ], [ [[IND_END10]], [[MIDDLE_BLOCK]] ]
53; CHECK-NEXT:    [[PSRCB_ADDR_04_PH:%.*]] = phi i16* [ [[PSRCB]], [[WHILE_BODY_PREHEADER]] ], [ [[IND_END12]], [[MIDDLE_BLOCK]] ]
54; CHECK-NEXT:    br label [[WHILE_BODY:%.*]]
55; CHECK:       while.body:
56; CHECK-NEXT:    [[BLKCNT_07:%.*]] = phi i32 [ [[DEC:%.*]], [[WHILE_BODY]] ], [ [[BLKCNT_07_PH]], [[WHILE_BODY_PREHEADER17]] ]
57; CHECK-NEXT:    [[PSRCA_ADDR_06:%.*]] = phi i16* [ [[INCDEC_PTR:%.*]], [[WHILE_BODY]] ], [ [[PSRCA_ADDR_06_PH]], [[WHILE_BODY_PREHEADER17]] ]
58; CHECK-NEXT:    [[PDST_ADDR_05:%.*]] = phi i16* [ [[INCDEC_PTR4:%.*]], [[WHILE_BODY]] ], [ [[PDST_ADDR_05_PH]], [[WHILE_BODY_PREHEADER17]] ]
59; CHECK-NEXT:    [[PSRCB_ADDR_04:%.*]] = phi i16* [ [[INCDEC_PTR1:%.*]], [[WHILE_BODY]] ], [ [[PSRCB_ADDR_04_PH]], [[WHILE_BODY_PREHEADER17]] ]
60; CHECK-NEXT:    [[INCDEC_PTR]] = getelementptr inbounds i16, i16* [[PSRCA_ADDR_06]], i32 1
61; CHECK-NEXT:    [[TMP10:%.*]] = load i16, i16* [[PSRCA_ADDR_06]], align 2
62; CHECK-NEXT:    [[CONV:%.*]] = sext i16 [[TMP10]] to i32
63; CHECK-NEXT:    [[INCDEC_PTR1]] = getelementptr inbounds i16, i16* [[PSRCB_ADDR_04]], i32 1
64; CHECK-NEXT:    [[TMP11:%.*]] = load i16, i16* [[PSRCB_ADDR_04]], align 2
65; CHECK-NEXT:    [[CONV2:%.*]] = sext i16 [[TMP11]] to i32
66; CHECK-NEXT:    [[MUL:%.*]] = mul nsw i32 [[CONV2]], [[CONV]]
67; CHECK-NEXT:    [[SHR:%.*]] = ashr i32 [[MUL]], 15
68; CHECK-NEXT:    [[TMP12:%.*]] = tail call i32 @llvm.smin.i32(i32 [[SHR]], i32 32767) #[[ATTR2:[0-9]+]]
69; CHECK-NEXT:    [[CONV3:%.*]] = trunc i32 [[TMP12]] to i16
70; CHECK-NEXT:    [[INCDEC_PTR4]] = getelementptr inbounds i16, i16* [[PDST_ADDR_05]], i32 1
71; CHECK-NEXT:    store i16 [[CONV3]], i16* [[PDST_ADDR_05]], align 2
72; CHECK-NEXT:    [[DEC]] = add i32 [[BLKCNT_07]], -1
73; CHECK-NEXT:    [[CMP_NOT:%.*]] = icmp eq i32 [[DEC]], 0
74; CHECK-NEXT:    br i1 [[CMP_NOT]], label [[WHILE_END]], label [[WHILE_BODY]], !llvm.loop [[LOOP2:![0-9]+]]
75; CHECK:       while.end:
76; CHECK-NEXT:    ret void
77;
78entry:
79  %pSrcA.addr = alloca i16*, align 4
80  %pSrcB.addr = alloca i16*, align 4
81  %pDst.addr = alloca i16*, align 4
82  %blockSize.addr = alloca i32, align 4
83  %blkCnt = alloca i32, align 4
84  store i16* %pSrcA, i16** %pSrcA.addr, align 4
85  store i16* %pSrcB, i16** %pSrcB.addr, align 4
86  store i16* %pDst, i16** %pDst.addr, align 4
87  store i32 %blockSize, i32* %blockSize.addr, align 4
88  %0 = bitcast i32* %blkCnt to i8*
89  call void @llvm.lifetime.start.p0i8(i64 4, i8* %0) #3
90  %1 = load i32, i32* %blockSize.addr, align 4
91  store i32 %1, i32* %blkCnt, align 4
92  br label %while.cond
93
94while.cond:                                       ; preds = %while.body, %entry
95  %2 = load i32, i32* %blkCnt, align 4
96  %cmp = icmp ugt i32 %2, 0
97  br i1 %cmp, label %while.body, label %while.end
98
99while.body:                                       ; preds = %while.cond
100  %3 = load i16*, i16** %pSrcA.addr, align 4
101  %incdec.ptr = getelementptr inbounds i16, i16* %3, i32 1
102  store i16* %incdec.ptr, i16** %pSrcA.addr, align 4
103  %4 = load i16, i16* %3, align 2
104  %conv = sext i16 %4 to i32
105  %5 = load i16*, i16** %pSrcB.addr, align 4
106  %incdec.ptr1 = getelementptr inbounds i16, i16* %5, i32 1
107  store i16* %incdec.ptr1, i16** %pSrcB.addr, align 4
108  %6 = load i16, i16* %5, align 2
109  %conv2 = sext i16 %6 to i32
110  %mul = mul nsw i32 %conv, %conv2
111  %shr = ashr i32 %mul, 15
112  %call = call i32 @__SSAT(i32 %shr, i32 16)
113  %conv3 = trunc i32 %call to i16
114  %7 = load i16*, i16** %pDst.addr, align 4
115  %incdec.ptr4 = getelementptr inbounds i16, i16* %7, i32 1
116  store i16* %incdec.ptr4, i16** %pDst.addr, align 4
117  store i16 %conv3, i16* %7, align 2
118  %8 = load i32, i32* %blkCnt, align 4
119  %dec = add i32 %8, -1
120  store i32 %dec, i32* %blkCnt, align 4
121  br label %while.cond
122
123while.end:                                        ; preds = %while.cond
124  %9 = bitcast i32* %blkCnt to i8*
125  call void @llvm.lifetime.end.p0i8(i64 4, i8* %9) #3
126  ret void
127}
128
129declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture) #1
130
131define internal i32 @__SSAT(i32 %val, i32 %sat) #2 {
132entry:
133  %retval = alloca i32, align 4
134  %val.addr = alloca i32, align 4
135  %sat.addr = alloca i32, align 4
136  %max = alloca i32, align 4
137  %min = alloca i32, align 4
138  %cleanup.dest.slot = alloca i32, align 4
139  store i32 %val, i32* %val.addr, align 4
140  store i32 %sat, i32* %sat.addr, align 4
141  %0 = load i32, i32* %sat.addr, align 4
142  %cmp = icmp uge i32 %0, 1
143  br i1 %cmp, label %land.lhs.true, label %if.end10
144
145land.lhs.true:                                    ; preds = %entry
146  %1 = load i32, i32* %sat.addr, align 4
147  %cmp1 = icmp ule i32 %1, 32
148  br i1 %cmp1, label %if.then, label %if.end10
149
150if.then:                                          ; preds = %land.lhs.true
151  %2 = bitcast i32* %max to i8*
152  call void @llvm.lifetime.start.p0i8(i64 4, i8* %2) #3
153  %3 = load i32, i32* %sat.addr, align 4
154  %sub = sub i32 %3, 1
155  %shl = shl i32 1, %sub
156  %sub2 = sub i32 %shl, 1
157  store i32 %sub2, i32* %max, align 4
158  %4 = bitcast i32* %min to i8*
159  call void @llvm.lifetime.start.p0i8(i64 4, i8* %4) #3
160  %5 = load i32, i32* %max, align 4
161  %sub3 = sub nsw i32 -1, %5
162  store i32 %sub3, i32* %min, align 4
163  %6 = load i32, i32* %val.addr, align 4
164  %7 = load i32, i32* %max, align 4
165  %cmp4 = icmp sgt i32 %6, %7
166  br i1 %cmp4, label %if.then5, label %if.else
167
168if.then5:                                         ; preds = %if.then
169  %8 = load i32, i32* %max, align 4
170  store i32 %8, i32* %retval, align 4
171  store i32 1, i32* %cleanup.dest.slot, align 4
172  br label %cleanup
173
174if.else:                                          ; preds = %if.then
175  %9 = load i32, i32* %val.addr, align 4
176  %10 = load i32, i32* %min, align 4
177  %cmp6 = icmp slt i32 %9, %10
178  br i1 %cmp6, label %if.then7, label %if.end
179
180if.then7:                                         ; preds = %if.else
181  %11 = load i32, i32* %min, align 4
182  store i32 %11, i32* %retval, align 4
183  store i32 1, i32* %cleanup.dest.slot, align 4
184  br label %cleanup
185
186if.end:                                           ; preds = %if.else
187  br label %if.end8
188
189if.end8:                                          ; preds = %if.end
190  store i32 0, i32* %cleanup.dest.slot, align 4
191  br label %cleanup
192
193cleanup:                                          ; preds = %if.end8, %if.then7, %if.then5
194  %12 = bitcast i32* %min to i8*
195  call void @llvm.lifetime.end.p0i8(i64 4, i8* %12) #3
196  %13 = bitcast i32* %max to i8*
197  call void @llvm.lifetime.end.p0i8(i64 4, i8* %13) #3
198  %cleanup.dest = load i32, i32* %cleanup.dest.slot, align 4
199  switch i32 %cleanup.dest, label %unreachable [
200  i32 0, label %cleanup.cont
201  i32 1, label %return
202  ]
203
204cleanup.cont:                                     ; preds = %cleanup
205  br label %if.end10
206
207if.end10:                                         ; preds = %cleanup.cont, %land.lhs.true, %entry
208  %14 = load i32, i32* %val.addr, align 4
209  store i32 %14, i32* %retval, align 4
210  br label %return
211
212return:                                           ; preds = %if.end10, %cleanup
213  %15 = load i32, i32* %retval, align 4
214  ret i32 %15
215
216unreachable:                                      ; preds = %cleanup
217  unreachable
218}
219
220declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture) #1
221
222attributes #0 = { nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "no-signed-zeros-fp-math"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="cortex-m55" "target-features"="+armv8.1-m.main,+dsp,+fp-armv8d16,+fp-armv8d16sp,+fp16,+fp64,+fullfp16,+hwdiv,+lob,+mve,+mve.fp,+ras,+strict-align,+thumb-mode,+vfp2,+vfp2sp,+vfp3d16,+vfp3d16sp,+vfp4d16,+vfp4d16sp,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-fp-armv8,-fp-armv8sp,-fp16fml,-hwdiv-arm,-i8mm,-neon,-sb,-sha2,-vfp3,-vfp3sp,-vfp4,-vfp4sp" "unsafe-fp-math"="true" }
223attributes #1 = { argmemonly nofree nosync nounwind willreturn }
224attributes #2 = { alwaysinline nounwind "frame-pointer"="all" "min-legal-vector-width"="0" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "no-signed-zeros-fp-math"="true" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="cortex-m55" "target-features"="+armv8.1-m.main,+dsp,+fp-armv8d16,+fp-armv8d16sp,+fp16,+fp64,+fullfp16,+hwdiv,+lob,+mve,+mve.fp,+ras,+strict-align,+thumb-mode,+vfp2,+vfp2sp,+vfp3d16,+vfp3d16sp,+vfp4d16,+vfp4d16sp,-aes,-bf16,-cdecp0,-cdecp1,-cdecp2,-cdecp3,-cdecp4,-cdecp5,-cdecp6,-cdecp7,-crc,-crypto,-d32,-dotprod,-fp-armv8,-fp-armv8sp,-fp16fml,-hwdiv-arm,-i8mm,-neon,-sb,-sha2,-vfp3,-vfp3sp,-vfp4,-vfp4sp" "unsafe-fp-math"="true" }
225attributes #3 = { nounwind }
226