From e6bfb0919ced05ab2fdca54783bfac6dfdc7a6be Mon Sep 17 00:00:00 2001 From: Craig Topper Date: Fri, 1 Mar 2019 21:02:34 +0000 Subject: [PATCH] [X86] Add test case for D58805. NFC This demonstrates dead store elimination removing a store that may alias a gather that uses null as its base. llvm-svn: 355227 --- .../DeadStoreElimination/X86/gather-null-pointer.ll | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 llvm/test/Transforms/DeadStoreElimination/X86/gather-null-pointer.ll diff --git a/llvm/test/Transforms/DeadStoreElimination/X86/gather-null-pointer.ll b/llvm/test/Transforms/DeadStoreElimination/X86/gather-null-pointer.ll new file mode 100644 index 0000000..bd187c0 --- /dev/null +++ b/llvm/test/Transforms/DeadStoreElimination/X86/gather-null-pointer.ll @@ -0,0 +1,20 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt < %s -dse -S | FileCheck %s + +; Both stores should be emitted because we can't tell if the gather aliases. + +define <4 x i32> @bar(<4 x i32> %arg, i32* %arg1) { +; CHECK-LABEL: @bar( +; CHECK-NEXT: bb: +; CHECK-NEXT: [[TMP:%.*]] = tail call <4 x i32> @llvm.x86.avx2.gather.d.d(<4 x i32> zeroinitializer, i8* null, <4 x i32> [[ARG:%.*]], <4 x i32> , i8 1) +; CHECK-NEXT: store i32 10, i32* [[ARG1:%.*]] +; CHECK-NEXT: ret <4 x i32> [[TMP]] +; +bb: + store i32 5, i32* %arg1 + %tmp = tail call <4 x i32> @llvm.x86.avx2.gather.d.d(<4 x i32> zeroinitializer, i8* null, <4 x i32> %arg, <4 x i32> , i8 1) + store i32 10, i32* %arg1 + ret <4 x i32> %tmp +} + +declare <4 x i32> @llvm.x86.avx2.gather.d.d(<4 x i32>, i8*, <4 x i32>, <4 x i32>, i8) -- 2.7.4