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[X86][SSE] Enable initial support for domain crossing at high shuffle combine depths.

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As discussed on D27692, this permits another domain to be used to combine a shuffle at high depths.

We currently set the required depth at 4 or more combined shuffles, this is probably too high for most targets but is a good starting point and already helps avoid a number of costly variable shuffles.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295608 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Pilgrim 2017-02-19 17:19:38 +00:00
parent cff0f13b4b
commit 0c9c0d47aa
2 changed files with 14 additions and 14 deletions
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6
lib/Target/X86/X86ISelLowering.cpp
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@ -26971,9 +26971,9 @@ static bool combineX86ShuffleChain(ArrayRef<SDValue> Inputs, SDValue Root,
unsigned Shuffle, PermuteImm;
// Which shuffle domains are permitted?
// TODO - Allow either domain after a threshold depth.
bool AllowFloatDomain = FloatDomain;
bool AllowIntDomain = !FloatDomain;
// Permit domain crossing at higher combine depths.
bool AllowFloatDomain = FloatDomain || (Depth > 3);
bool AllowIntDomain = !FloatDomain || (Depth > 3);
if (UnaryShuffle) {
// If we are shuffling a X86ISD::VZEXT_LOAD then we can use the load

22
test/CodeGen/X86/shuffle-vs-trunc-512.ll
View File

@ -100,11 +100,11 @@ define void @trunc_v32i16_to_v32i8(<64 x i8>* %L, <32 x i8>* %S) nounwind {
define void @shuffle_v32i16_to_v16i16(<32 x i16>* %L, <16 x i16>* %S) nounwind {
; AVX512F-LABEL: shuffle_v32i16_to_v16i16:
; AVX512F: # BB#0:
; AVX512F-NEXT: vmovdqa (%rdi), %ymm0
; AVX512F-NEXT: vmovdqa 32(%rdi), %ymm1
; AVX512F-NEXT: vpshufb {{.*#+}} ymm1 = ymm1[0,1,4,5,4,5,6,7,0,1,4,5,8,9,12,13,16,17,20,21,20,21,22,23,16,17,20,21,24,25,28,29]
; AVX512F-NEXT: vpshufb {{.*#+}} ymm0 = ymm0[0,1,4,5,8,9,12,13,8,9,12,13,12,13,14,15,16,17,20,21,24,25,28,29,24,25,28,29,28,29,30,31]
; AVX512F-NEXT: vpblendd {{.*#+}} ymm0 = ymm0[0,1],ymm1[2,3],ymm0[4,5],ymm1[6,7]
; AVX512F-NEXT: vpshuflw {{.*#+}} ymm0 = mem[0,2,2,3,4,5,6,7,8,10,10,11,12,13,14,15]
; AVX512F-NEXT: vpshufhw {{.*#+}} ymm0 = ymm0[0,1,2,3,4,6,6,7,8,9,10,11,12,14,14,15]
; AVX512F-NEXT: vpshuflw {{.*#+}} ymm1 = mem[0,2,2,3,4,5,6,7,8,10,10,11,12,13,14,15]
; AVX512F-NEXT: vpshufhw {{.*#+}} ymm1 = ymm1[0,1,2,3,4,6,6,7,8,9,10,11,12,14,14,15]
; AVX512F-NEXT: vshufps {{.*#+}} ymm0 = ymm1[0,2],ymm0[0,2],ymm1[4,6],ymm0[4,6]
; AVX512F-NEXT: vpermq {{.*#+}} ymm0 = ymm0[0,2,1,3]
; AVX512F-NEXT: vmovdqa %ymm0, (%rsi)
; AVX512F-NEXT: retq
@ -113,11 +113,9 @@ define void @shuffle_v32i16_to_v16i16(<32 x i16>* %L, <16 x i16>* %S) nounwind {
; AVX512VL: # BB#0:
; AVX512VL-NEXT: vpshuflw {{.*#+}} ymm0 = mem[0,2,2,3,4,5,6,7,8,10,10,11,12,13,14,15]
; AVX512VL-NEXT: vpshufhw {{.*#+}} ymm0 = ymm0[0,1,2,3,4,6,6,7,8,9,10,11,12,14,14,15]
; AVX512VL-NEXT: vpshufd {{.*#+}} ymm0 = ymm0[0,1,0,2,4,5,4,6]
; AVX512VL-NEXT: vpshuflw {{.*#+}} ymm1 = mem[0,2,2,3,4,5,6,7,8,10,10,11,12,13,14,15]
; AVX512VL-NEXT: vpshufhw {{.*#+}} ymm1 = ymm1[0,1,2,3,4,6,6,7,8,9,10,11,12,14,14,15]
; AVX512VL-NEXT: vpshufd {{.*#+}} ymm1 = ymm1[0,2,2,3,4,6,6,7]
; AVX512VL-NEXT: vpblendd {{.*#+}} ymm0 = ymm1[0,1],ymm0[2,3],ymm1[4,5],ymm0[6,7]
; AVX512VL-NEXT: vshufps {{.*#+}} ymm0 = ymm1[0,2],ymm0[0,2],ymm1[4,6],ymm0[4,6]
; AVX512VL-NEXT: vpermq {{.*#+}} ymm0 = ymm0[0,2,1,3]
; AVX512VL-NEXT: vmovdqa %ymm0, (%rsi)
; AVX512VL-NEXT: retq
@ -126,9 +124,11 @@ define void @shuffle_v32i16_to_v16i16(<32 x i16>* %L, <16 x i16>* %S) nounwind {
; AVX512BW: # BB#0:
; AVX512BW-NEXT: vmovdqu16 (%rdi), %zmm0
; AVX512BW-NEXT: vextracti64x4 $1, %zmm0, %ymm1
; AVX512BW-NEXT: vpshufb {{.*#+}} ymm1 = ymm1[0,1,4,5,4,5,6,7,0,1,4,5,8,9,12,13,16,17,20,21,20,21,22,23,16,17,20,21,24,25,28,29]
; AVX512BW-NEXT: vpshufb {{.*#+}} ymm0 = ymm0[0,1,4,5,8,9,12,13,8,9,12,13,12,13,14,15,16,17,20,21,24,25,28,29,24,25,28,29,28,29,30,31]
; AVX512BW-NEXT: vpblendd {{.*#+}} ymm0 = ymm0[0,1],ymm1[2,3],ymm0[4,5],ymm1[6,7]
; AVX512BW-NEXT: vpshuflw {{.*#+}} ymm1 = ymm1[0,2,2,3,4,5,6,7,8,10,10,11,12,13,14,15]
; AVX512BW-NEXT: vpshufhw {{.*#+}} ymm1 = ymm1[0,1,2,3,4,6,6,7,8,9,10,11,12,14,14,15]
; AVX512BW-NEXT: vpshuflw {{.*#+}} ymm0 = ymm0[0,2,2,3,4,5,6,7,8,10,10,11,12,13,14,15]
; AVX512BW-NEXT: vpshufhw {{.*#+}} ymm0 = ymm0[0,1,2,3,4,6,6,7,8,9,10,11,12,14,14,15]
; AVX512BW-NEXT: vshufps {{.*#+}} ymm0 = ymm0[0,2],ymm1[0,2],ymm0[4,6],ymm1[4,6]
; AVX512BW-NEXT: vpermq {{.*#+}} ymm0 = ymm0[0,2,1,3]
; AVX512BW-NEXT: vmovdqa %ymm0, (%rsi)
; AVX512BW-NEXT: retq