6601be4419
This reverts commit 2a419a0b99.
The result of a shufflevector must not propagate poison from any element
other than the one noted in the shuffle mask.
The regressions outside of fptoui-may-overflow.ll can probably be
recovered some other way; for example, using isGuaranteedNotToBePoison.
See discussion on https://reviews.llvm.org/D106053 for more background.
Differential Revision: https://reviews.llvm.org/D106222
37 lines
1.8 KiB
LLVM
37 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=avx | FileCheck %s
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; @fptoui_zext is legal to optimize to a single vcvttps2dq: if one of the i8
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; results of fptoui is poisoned, the corresponding i32 result of the zext is
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; also poisoned. We currently don't implement this optimization.
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define <16 x i8> @fptoui_zext(<4 x float> %arg) {
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; CHECK-LABEL: fptoui_zext:
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; CHECK: # %bb.0:
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; CHECK-NEXT: vcvttps2dq %xmm0, %xmm0
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; CHECK-NEXT: vpackusdw %xmm0, %xmm0, %xmm0
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; CHECK-NEXT: vpackuswb %xmm0, %xmm0, %xmm0
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; CHECK-NEXT: vpmovzxbd {{.*#+}} xmm0 = xmm0[0],zero,zero,zero,xmm0[1],zero,zero,zero,xmm0[2],zero,zero,zero,xmm0[3],zero,zero,zero
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; CHECK-NEXT: retq
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%f = fptoui <4 x float> %arg to <4 x i8>
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%z = zext <4 x i8> %f to <4 x i32>
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%b = bitcast <4 x i32> %z to <16 x i8>
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ret <16 x i8> %b
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}
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; In @fptoui_shuffle, we must preserve the vpand for correctnesss. Only the
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; i8 values extracted from %s are poison. The values from the zeroinitializer
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; are not.
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define <16 x i8> @fptoui_shuffle(<4 x float> %arg) {
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; CHECK-LABEL: fptoui_shuffle:
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; CHECK: # %bb.0:
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; CHECK-NEXT: vcvttps2dq %xmm0, %xmm0
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; CHECK-NEXT: vandps {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0, %xmm0
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; CHECK-NEXT: retq
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%f = fptoui <4 x float> %arg to <4 x i8>
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%s = shufflevector <4 x i8> %f, <4 x i8> undef, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
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%ss = shufflevector <16 x i8> %s, <16 x i8> zeroinitializer, <16 x i32> <i32 0, i32 17, i32 18, i32 19, i32 1, i32 21, i32 22, i32 23, i32 2, i32 25, i32 26, i32 27, i32 3, i32 29, i32 30, i32 31>
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ret <16 x i8> %ss
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}
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