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Elena Demikhovsky
81518f1117
PACKUSWB converts Signed word to Unsigned byte, (the same about DW) and it can't be used for umin+truncate pattern. AVX-512 VPMOVUS* instructions fit the pattern since they convert Unsigned to Unsigned. See https://llvm.org/bugs/show_bug.cgi?id=31773 Differential Revision: https://reviews.llvm.org/D29196 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293431 91177308-0d34-0410-b5e6-96231b3b80d8
21 lines
1.2 KiB
LLVM
21 lines
1.2 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx | FileCheck %s
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; This matter of this test is ensuring that vpackus* is not used for umin+trunc combination, since vpackus* input is a signed number.
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define <16 x i8> @usat_trunc_wb_256(<16 x i16> %i) {
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; CHECK-LABEL: usat_trunc_wb_256:
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; CHECK-NOT: vpackuswb %xmm1, %xmm0, %xmm0
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%x3 = icmp ult <16 x i16> %i, <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
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%x5 = select <16 x i1> %x3, <16 x i16> %i, <16 x i16> <i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255, i16 255>
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%x6 = trunc <16 x i16> %x5 to <16 x i8>
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ret <16 x i8> %x6
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}
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define <8 x i16> @usat_trunc_dw_256(<8 x i32> %i) {
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; CHECK-LABEL: usat_trunc_dw_256:
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; CHECK-NOT: vpackusdw %xmm1, %xmm0, %xmm0
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%x3 = icmp ult <8 x i32> %i, <i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535>
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%x5 = select <8 x i1> %x3, <8 x i32> %i, <8 x i32> <i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535, i32 65535>
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%x6 = trunc <8 x i32> %x5 to <8 x i16>
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ret <8 x i16> %x6
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}
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