1; RUN: opt %s -O2 -S | FileCheck %s
2
3; Check that llvm.x86.avx2.gather.d.ps.256 intrinsic is not eliminated as gather and store memory accesses are based on arr.ptr
4target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
5target triple = "x86_64-unknown-linux-gnu"
6
7; Function Attrs: nounwind readonly
8declare <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float>, i8*, <8 x i32>, <8 x float>, i8) #0
9
10; Function Attrs: nounwind
11define <8 x float> @foo1(i8* noalias readonly %arr.ptr, <8 x i32>* noalias readonly %vix.ptr, i8* noalias %t2.ptr) #1 {
12allocas:
13  %vix = load <8 x i32>* %vix.ptr, align 4
14  %t1.ptr = getelementptr i8* %arr.ptr, i8 4
15
16  %v1 = tail call <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float> undef, i8* %arr.ptr, <8 x i32> %vix, <8 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, i8 1) #2
17  store i8 1, i8* %t1.ptr, align 4
18
19  %v2 = tail call <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float> undef, i8* %arr.ptr, <8 x i32> %vix, <8 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, i8 1) #2
20  %res = fadd <8 x float> %v1, %v2
21
22  ret <8 x float> %res
23}
24; CHECK: foo1
25; CHECK: llvm.x86.avx2.gather.d.ps.256
26; CHECK: store
27; CHECK: llvm.x86.avx2.gather.d.ps.256
28
29; Check that second gather is eliminated as gather and store memory accesses are based on different no-aliasing pointers
30
31; Function Attrs: nounwind
32define <8 x float> @foo2(i8* noalias readonly %arr.ptr, <8 x i32>* noalias readonly %vix.ptr, i8* noalias %t2.ptr) #1 {
33allocas:
34  %vix = load <8 x i32>* %vix.ptr, align 4
35  %t1.ptr = getelementptr i8* %arr.ptr, i8 4
36
37  %v1 = tail call <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float> undef, i8* %arr.ptr, <8 x i32> %vix, <8 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, i8 1) #2
38  store i8 1, i8* %t2.ptr, align 4
39
40  %v2 = tail call <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float> undef, i8* %arr.ptr, <8 x i32> %vix, <8 x float> <float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000, float 0xFFFFFFFFE0000000>, i8 1) #2
41  %res = fadd <8 x float> %v1, %v2
42
43  ret <8 x float> %res
44}
45; CHECK: foo2
46; CHECK: llvm.x86.avx2.gather.d.ps.256
47; CHECK: store
48; CHECK-NOT: llvm.x86.avx2.gather.d.ps.256
49
50attributes #0 = { nounwind readonly }
51attributes #1 = { nounwind "target-cpu"="corei7-avx" "target-features"="+avx2,+popcnt,+cmov,+f16c,+rdrnd,+fma" }
52attributes #2 = { nounwind }
53
54