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[X86][SSE] Add examples of failures to remove a permute(pack(pack(),pack())) shuffle by reordering the packed operands.

This commit is contained in:
Simon Pilgrim 2021-05-10 17:50:26 +01:00
parent 80b9510806
commit 22f834210a
1 changed files with 38 additions and 0 deletions
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llvm/test/CodeGen/X86/horizontal-shuffle-4.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=i686-apple-darwin -mattr=+avx2 | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-apple-darwin -mattr=+avx2 | FileCheck %s
define <16 x i8> @permute_packss_packss_128(<4 x i32> %a0, <4 x i32> %a1, <4 x i32> %a2, <4 x i32> %a3) {
; CHECK-LABEL: permute_packss_packss_128:
; CHECK: ## %bb.0:
; CHECK-NEXT: vpackssdw %xmm1, %xmm0, %xmm0
; CHECK-NEXT: vpackssdw %xmm3, %xmm2, %xmm1
; CHECK-NEXT: vpacksswb %xmm1, %xmm0, %xmm0
; CHECK-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[1,2,3,0]
; CHECK-NEXT: ret{{[l|q]}}
%1 = call <8 x i16> @llvm.x86.sse2.packssdw.128(<4 x i32> %a0, <4 x i32> %a1)
%2 = call <8 x i16> @llvm.x86.sse2.packssdw.128(<4 x i32> %a2, <4 x i32> %a3)
%3 = call <16 x i8> @llvm.x86.sse2.packsswb.128(<8 x i16> %1, <8 x i16> %2)
%4 = shufflevector <16 x i8> %3, <16 x i8> poison, <16 x i32> <i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 0, i32 1, i32 2, i32 3>
ret <16 x i8> %4
}
define <16 x i8> @permute_packss_packus_128(<4 x i32> %a0, <4 x i32> %a1, <4 x i32> %a2, <4 x i32> %a3) {
; CHECK-LABEL: permute_packss_packus_128:
; CHECK: ## %bb.0:
; CHECK-NEXT: vpackusdw %xmm1, %xmm0, %xmm0
; CHECK-NEXT: vpackusdw %xmm3, %xmm2, %xmm1
; CHECK-NEXT: vpackuswb %xmm1, %xmm0, %xmm0
; CHECK-NEXT: vpshufd {{.*#+}} xmm0 = xmm0[1,2,3,0]
; CHECK-NEXT: ret{{[l|q]}}
%1 = call <8 x i16> @llvm.x86.sse41.packusdw(<4 x i32> %a0, <4 x i32> %a1)
%2 = call <8 x i16> @llvm.x86.sse41.packusdw(<4 x i32> %a2, <4 x i32> %a3)
%3 = call <16 x i8> @llvm.x86.sse2.packuswb.128(<8 x i16> %1, <8 x i16> %2)
%4 = shufflevector <16 x i8> %3, <16 x i8> poison, <16 x i32> <i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 0, i32 1, i32 2, i32 3>
ret <16 x i8> %4
}
declare <16 x i8> @llvm.x86.sse2.packsswb.128(<8 x i16>, <8 x i16>)
declare <8 x i16> @llvm.x86.sse2.packssdw.128(<4 x i32>, <4 x i32>)
declare <16 x i8> @llvm.x86.sse2.packuswb.128(<8 x i16>, <8 x i16>)
declare <8 x i16> @llvm.x86.sse41.packusdw(<4 x i32>, <4 x i32>)