1 files changed, 53 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/pr18573.ll b/test/Analysis/BasicAA/pr18573.ll
new file mode 100644
index 0000000..1d2a316
--- /dev/null
+++ b/test/Analysis/BasicAA/pr18573.ll
@@ -0,0 +1,53 @@
+; RUN: opt %s -O2 -S | FileCheck %s
+
+; Check that llvm.x86.avx2.gather.d.ps.256 intrinsic is not eliminated as gather and store memory accesses are based on arr.ptr
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Function Attrs: nounwind readonly
+declare <8 x float> @llvm.x86.avx2.gather.d.ps.256(<8 x float>, i8*, <8 x i32>, <8 x float>, i8) #0
+
+; Function Attrs: nounwind
+define <8 x float> @foo1(i8* noalias readonly %arr.ptr, <8 x i32>* noalias readonly %vix.ptr, i8* noalias %t2.ptr) #1 {
+allocas:
+  %vix = load <8 x i32>* %vix.ptr, align 4
+  %t1.ptr = getelementptr i8* %arr.ptr, i8 4
+  
+  %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
+  store i8 1, i8* %t1.ptr, align 4
+
+  %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
+  %res = fadd <8 x float> %v1, %v2
+
+  ret <8 x float> %res
+}
+; CHECK: foo1
+; CHECK: llvm.x86.avx2.gather.d.ps.256
+; CHECK: store
+; CHECK: llvm.x86.avx2.gather.d.ps.256
+
+; Check that second gather is eliminated as gather and store memory accesses are based on different no-aliasing pointers
+
+; Function Attrs: nounwind
+define <8 x float> @foo2(i8* noalias readonly %arr.ptr, <8 x i32>* noalias readonly %vix.ptr, i8* noalias %t2.ptr) #1 {
+allocas:
+  %vix = load <8 x i32>* %vix.ptr, align 4
+  %t1.ptr = getelementptr i8* %arr.ptr, i8 4
+  
+  %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
+  store i8 1, i8* %t2.ptr, align 4
+
+  %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
+  %res = fadd <8 x float> %v1, %v2
+
+  ret <8 x float> %res
+}
+; CHECK: foo2
+; CHECK: llvm.x86.avx2.gather.d.ps.256
+; CHECK: store
+; CHECK-NOT: llvm.x86.avx2.gather.d.ps.256
+
+attributes #0 = { nounwind readonly }
+attributes #1 = { nounwind "target-cpu"="corei7-avx" "target-features"="+avx2,+popcnt,+cmov,+f16c,+rdrnd,+fma" }
+attributes #2 = { nounwind }
+