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[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
This commit is contained in:
Craig Topper 2019-03-01 21:02:34 +00:00
parent 1ca25763f0
commit e6bfb0919c
1 changed files with 20 additions and 0 deletions
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llvm/test/Transforms/DeadStoreElimination/X86/gather-null-pointer.ll Normal file
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; 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> <i32 -1, i32 -1, i32 -1, i32 -1>, 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> <i32 -1, i32 -1, i32 -1, i32 -1>, 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)