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[X86][SSE] Classify AND bitmasks as variable shuffle masks

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They are loading the bitmasks from the constant pool so the cost is similar to loading a shuffle mask.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288367 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Simon Pilgrim 2016-12-01 16:00:14 +00:00
parent 3160d05cd6
commit 25c80fbd2a
2 changed files with 4 additions and 6 deletions
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4
lib/Target/X86/X86ISelLowering.cpp
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@ -4061,6 +4061,7 @@ static bool isTargetShuffle(unsigned Opcode) {
static bool isTargetShuffleVariableMask(unsigned Opcode) {
switch (Opcode) {
default: return false;
// Target Shuffles.
case X86ISD::PSHUFB:
case X86ISD::VPERMILPV:
case X86ISD::VPERMIL2:
@ -4069,6 +4070,9 @@ static bool isTargetShuffleVariableMask(unsigned Opcode) {
case X86ISD::VPERMV3:
case X86ISD::VPERMIV3:
return true;
// 'Faux' Target Shuffles.
case ISD::AND:
return true;
}
}

6
test/CodeGen/X86/vector-shuffle-128-v2.ll
View File

@ -940,22 +940,16 @@ define <2 x double> @shuffle_v2f64_bitcast_1z(<2 x double> %a) {
define <2 x i64> @shuffle_v2i64_bitcast_z123(<2 x i64> %x) {
; SSE2-LABEL: shuffle_v2i64_bitcast_z123:
; SSE2: # BB#0:
; SSE2-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; SSE2-NEXT: movss {{.*#+}} xmm0 = xmm1[0],xmm0[1,2,3]
; SSE2-NEXT: andps {{.*}}(%rip), %xmm0
; SSE2-NEXT: retq
;
; SSE3-LABEL: shuffle_v2i64_bitcast_z123:
; SSE3: # BB#0:
; SSE3-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; SSE3-NEXT: movss {{.*#+}} xmm0 = xmm1[0],xmm0[1,2,3]
; SSE3-NEXT: andps {{.*}}(%rip), %xmm0
; SSE3-NEXT: retq
;
; SSSE3-LABEL: shuffle_v2i64_bitcast_z123:
; SSSE3: # BB#0:
; SSSE3-NEXT: movss {{.*#+}} xmm1 = mem[0],zero,zero,zero
; SSSE3-NEXT: movss {{.*#+}} xmm0 = xmm1[0],xmm0[1,2,3]
; SSSE3-NEXT: andps {{.*}}(%rip), %xmm0
; SSSE3-NEXT: retq
;