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[X86] Add test showing failure to fold freeze(insert_subvector(x,y,c)) -> insert_subvector(freeze(x),freeze(y),c) 

If at least one of x and y are known never poison.
This commit is contained in:
Simon Pilgrim 2022-09-03 13:27:08 +01:00
parent e2d140e9c3
commit 3968844bff
1 changed files with 16 additions and 0 deletions
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16
llvm/test/CodeGen/X86/freeze-vector.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-- -mattr=+avx | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-- -mattr=+avx2 | FileCheck %s
define <4 x i32> @freeze_insert_subvector(<8 x i32> %a0) nounwind {
; CHECK-LABEL: freeze_insert_subvector:
; CHECK: # %bb.0:
; CHECK-NEXT: vmovaps %xmm0, %xmm0
; CHECK-NEXT: vextractf128 $1, %ymm0, %xmm0
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: ret{{[l|q]}}
%x = shufflevector <8 x i32> %a0, <8 x i32> zeroinitializer, <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 8, i32 9, i32 10, i32 11>
%y = freeze <8 x i32> %x
%z = shufflevector <8 x i32> %y, <8 x i32> poison, <4 x i32> <i32 4, i32 5, i32 6, i32 7>
ret <4 x i32> %z
}