RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-11-23 11:13:28 +01:00
Code Issues Projects Releases Wiki Activity

[X86][SSE] getFauxShuffleMask - don't decode OR(SHUFFLE,SHUFFLE) containing UNDEFs. (PR50049)

Browse Source 
PR50049 demonstrated an infinite loop between OR(SHUFFLE,SHUFFLE) <-> BLEND(SHUFFLE,SHUFFLE) patterns.

The UNDEF elements were allowing a combined shuffle mask to be widened which lost the undef element, resulting us needing to use the BLEND pattern (as the undef element would need to be zero for the OR pattern). But then bitcast folds would re-expose the undef element allowing us to use OR again.....
This commit is contained in:
Simon Pilgrim 2021-04-21 17:43:23 +01:00
parent bd70c1c8f2
commit 411f75a025
5 changed files with 57 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/Target/X86/X86ISelLowering.cpp
View File

@ -7542,9 +7542,11 @@ static bool getFauxShuffleMask(SDValue N, const APInt &DemandedElts,
narrowShuffleMaskElts(MaskSize / SrcMask0.size(), SrcMask0, Mask0);
narrowShuffleMaskElts(MaskSize / SrcMask1.size(), SrcMask1, Mask1);
for (int i = 0; i != (int)MaskSize; ++i) {
if (Mask0[i] == SM_SentinelUndef && Mask1[i] == SM_SentinelUndef)
Mask.push_back(SM_SentinelUndef);
else if (Mask0[i] == SM_SentinelZero && Mask1[i] == SM_SentinelZero)
// NOTE: Don't handle SM_SentinelUndef, as we can end up in infinite
// loops converting between OR and BLEND shuffles due to
// canWidenShuffleElements merging away undef elements, meaning we
// fail to recognise the OR as the undef element isn't known zero.
if (Mask0[i] == SM_SentinelZero && Mask1[i] == SM_SentinelZero)
Mask.push_back(SM_SentinelZero);
else if (Mask1[i] == SM_SentinelZero)
Mask.push_back(i);

8
test/CodeGen/X86/shuffle-vs-trunc-256.ll
View File

@ -1245,10 +1245,10 @@ define void @trunc_v4i64_to_v4i8(<32 x i8>* %L, <4 x i8>* %S) nounwind {
define <16 x i8> @negative(<32 x i8> %v, <32 x i8> %w) nounwind {
; AVX1-LABEL: negative:
; AVX1: # %bb.0:
; AVX1-NEXT: vextractf128 $1, %ymm0, %xmm2
; AVX1-NEXT: vpshufb {{.*#+}} xmm2 = xmm2[u,u,u,u,u,u,u,u,0,2,4,6,8,10,12,14]
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[u,2,4,6,8,10,12,14,u,u,u,u,u,u,u,u]
; AVX1-NEXT: vpblendw {{.*#+}} xmm0 = xmm0[0,1,2,3],xmm2[4,5,6,7]
; AVX1-NEXT: vpshufb {{.*#+}} xmm2 = xmm0[u,2,4,6,8,10,12,14],zero,zero,zero,zero,zero,zero,zero,zero
; AVX1-NEXT: vextractf128 $1, %ymm0, %xmm0
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[u],zero,zero,zero,zero,zero,zero,zero,xmm0[0,2,4,6,8,10,12,14]
; AVX1-NEXT: vpor %xmm2, %xmm0, %xmm0
; AVX1-NEXT: vmovdqa {{.*#+}} xmm2 = [0,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255]
; AVX1-NEXT: vpblendvb %xmm2, %xmm0, %xmm1, %xmm0
; AVX1-NEXT: vzeroupper

5
test/CodeGen/X86/vector-shuffle-128-v8.ll
View File

@ -1651,8 +1651,9 @@ define <8 x i16> @shuffle_v8i16_XX4X8acX(<8 x i16> %a, <8 x i16> %b) {
;
; SSSE3-LABEL: shuffle_v8i16_XX4X8acX:
; SSSE3: # %bb.0:
; SSSE3-NEXT: pshufb {{.*#+}} xmm1 = xmm1[u,u,u,u,u,u,u,u,0,1,4,5,8,9,u,u]
; SSSE3-NEXT: shufps {{.*#+}} xmm0 = xmm0[0,2],xmm1[2,3]
; SSSE3-NEXT: pshufb {{.*#+}} xmm0 = xmm0[u,u,u,u,8,9,u,u],zero,zero,zero,zero,zero,zero,xmm0[u,u]
; SSSE3-NEXT: pshufb {{.*#+}} xmm1 = xmm1[u,u,u,u],zero,zero,xmm1[u,u,0,1,4,5,8,9,u,u]
; SSSE3-NEXT: por %xmm1, %xmm0
; SSSE3-NEXT: retq
;
; SSE41-LABEL: shuffle_v8i16_XX4X8acX:

6
test/CodeGen/X86/vector-shuffle-256-v32.ll
View File

@ -3254,9 +3254,9 @@ define <32 x i8> @shuffle_v32i8_42_45_12_13_35_35_60_40_17_22_29_44_33_12_48_51_
; AVX1-NEXT: vpshufb {{.*#+}} xmm2 = zero,zero,xmm2[u,u],zero,zero,xmm2[12],zero,xmm2[u,u,u],zero,zero,xmm2[u,0,3]
; AVX1-NEXT: vpshufb {{.*#+}} xmm1 = xmm1[10,13,u,u,3,3],zero,xmm1[8,u,u,u,12,1,u],zero,zero
; AVX1-NEXT: vpor %xmm2, %xmm1, %xmm1
; AVX1-NEXT: vpshufb {{.*#+}} xmm2 = xmm4[u,u,u,u,u,u,u,u,1,6,13,u,u,u,u,u]
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[u,u,12,13,u,u,u,u,u,u,u,u,u,12,u,u]
; AVX1-NEXT: vpblendw {{.*#+}} xmm0 = xmm0[0,1,2,3],xmm2[4,5],xmm0[6,7]
; AVX1-NEXT: vpshufb {{.*#+}} xmm2 = xmm4[u,u],zero,zero,xmm4[u,u,u,u,1,6,13,u,u],zero,xmm4[u,u]
; AVX1-NEXT: vpshufb {{.*#+}} xmm0 = xmm0[u,u,12,13,u,u,u,u],zero,zero,zero,xmm0[u,u,12,u,u]
; AVX1-NEXT: vpor %xmm2, %xmm0, %xmm0
; AVX1-NEXT: vmovdqa {{.*#+}} xmm2 = [255,255,0,0,255,255,255,255,0,0,0,255,255,0,255,255]
; AVX1-NEXT: vpblendvb %xmm2, %xmm1, %xmm0, %xmm0
; AVX1-NEXT: vinsertf128 $1, %xmm3, %ymm0, %ymm0

42
test/CodeGen/X86/vector-shuffle-combining-sse41.ll
View File

@ -21,3 +21,45 @@ define <16 x i8> @combine_vpshufb_as_movzx(<16 x i8> %a0) {
%res0 = call <16 x i8> @llvm.x86.ssse3.pshuf.b.128(<16 x i8> %a0, <16 x i8> <i8 0, i8 1, i8 2, i8 3, i8 -1, i8 -1, i8 -1, i8 -1, i8 undef, i8 undef, i8 undef, i8 undef, i8 -1, i8 -1, i8 -1, i8 -1>)
ret <16 x i8> %res0
}
define <16 x i8> @PR50049(<48 x i8>* %p1, <48 x i8>* %p2) {
; SSE-LABEL: PR50049:
; SSE: # %bb.0:
; SSE-NEXT: movdqa (%rdi), %xmm2
; SSE-NEXT: movdqa 16(%rdi), %xmm0
; SSE-NEXT: movdqa 32(%rdi), %xmm1
; SSE-NEXT: movdqa (%rsi), %xmm4
; SSE-NEXT: movdqa 16(%rsi), %xmm5
; SSE-NEXT: movdqa 32(%rsi), %xmm3
; SSE-NEXT: movdqa {{.*#+}} xmm6 = <128,128,128,128,128,128,2,5,8,11,14,u,u,u,u,u>
; SSE-NEXT: pshufb %xmm6, %xmm0
; SSE-NEXT: movdqa {{.*#+}} xmm7 = <0,3,6,9,12,15,128,128,128,128,128,u,u,u,u,u>
; SSE-NEXT: pshufb %xmm7, %xmm2
; SSE-NEXT: por %xmm0, %xmm2
; SSE-NEXT: pshufb %xmm6, %xmm5
; SSE-NEXT: pshufb %xmm7, %xmm4
; SSE-NEXT: por %xmm5, %xmm4
; SSE-NEXT: pmovzxbw {{.*#+}} xmm5 = xmm4[0],zero,xmm4[1],zero,xmm4[2],zero,xmm4[3],zero,xmm4[4],zero,xmm4[5],zero,xmm4[6],zero,xmm4[7],zero
; SSE-NEXT: pmovzxbw {{.*#+}} xmm0 = xmm2[0],zero,xmm2[1],zero,xmm2[2],zero,xmm2[3],zero,xmm2[4],zero,xmm2[5],zero,xmm2[6],zero,xmm2[7],zero
; SSE-NEXT: pmullw %xmm5, %xmm0
; SSE-NEXT: movdqa {{.*#+}} xmm5 = [255,255,255,255,255,255,255,255]
; SSE-NEXT: pand %xmm5, %xmm0
; SSE-NEXT: movdqa {{.*#+}} xmm6 = <8,u,9,u,10,u,128,u,128,u,128,u,128,u,128,u>
; SSE-NEXT: pshufb %xmm6, %xmm4
; SSE-NEXT: movdqa {{.*#+}} xmm7 = <128,u,128,u,128,u,1,u,4,u,7,u,10,u,13,u>
; SSE-NEXT: pshufb %xmm7, %xmm3
; SSE-NEXT: por %xmm4, %xmm3
; SSE-NEXT: pshufb %xmm6, %xmm2
; SSE-NEXT: pshufb %xmm7, %xmm1
; SSE-NEXT: por %xmm2, %xmm1
; SSE-NEXT: pmullw %xmm3, %xmm1
; SSE-NEXT: pand %xmm5, %xmm1
; SSE-NEXT: packuswb %xmm1, %xmm0
; SSE-NEXT: retq
%x1 = load <48 x i8>, <48 x i8>* %p1, align 16
%x2 = load <48 x i8>, <48 x i8>* %p2, align 16
%s1 = shufflevector <48 x i8> %x1, <48 x i8> poison, <16 x i32> <i32 0, i32 3, i32 6, i32 9, i32 12, i32 15, i32 18, i32 21, i32 24, i32 27, i32 30, i32 33, i32 36, i32 39, i32 42, i32 45>
%s2 = shufflevector <48 x i8> %x2, <48 x i8> poison, <16 x i32> <i32 0, i32 3, i32 6, i32 9, i32 12, i32 15, i32 18, i32 21, i32 24, i32 27, i32 30, i32 33, i32 36, i32 39, i32 42, i32 45>
%r = mul <16 x i8> %s1, %s2
ret <16 x i8> %r
}