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[X86][SSE] combinePTESTCC - fold TESTZ(X,~Y) -> TESTC(Y,X)

This commit is contained in:
Simon Pilgrim 2020-04-01 15:10:30 +01:00
parent fee0026fc7
commit eb8880562e
4 changed files with 22 additions and 31 deletions
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14
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -39836,13 +39836,19 @@ static SDValue combinePTESTCC(SDValue EFLAGS, X86::CondCode &CC,
}
}
// TODO: TESTZ(X,~Y) == TESTC(Y,X)
// TESTZ(X,-1) == TESTZ(X,X)
// TESTZ(-1,X) == TESTZ(X,X)
if (CC == X86::COND_E || CC == X86::COND_NE) {
// TESTZ(X,~Y) == TESTC(Y,X)
if (SDValue NotOp1 = IsNOT(Op1, DAG)) {
CC = (CC == X86::COND_E ? X86::COND_B : X86::COND_AE);
return DAG.getNode(EFLAGS.getOpcode(), SDLoc(EFLAGS), VT,
DAG.getBitcast(OpVT, NotOp1), Op0);
}
// TESTZ(-1,X) == TESTZ(X,X)
if (ISD::isBuildVectorAllOnes(Op0.getNode()))
return DAG.getNode(EFLAGS.getOpcode(), SDLoc(EFLAGS), VT, Op1, Op1);
// TESTZ(X,-1) == TESTZ(X,X)
if (ISD::isBuildVectorAllOnes(Op1.getNode()))
return DAG.getNode(EFLAGS.getOpcode(), SDLoc(EFLAGS), VT, Op0, Op0);
}

13
llvm/test/CodeGen/X86/combine-ptest.ll
View File

@ -42,10 +42,8 @@ define i32 @ptestz_128_invert1(<2 x i64> %c, <2 x i64> %d, i32 %a, i32 %b) {
; CHECK-LABEL: ptestz_128_invert1:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: vpcmpeqd %xmm2, %xmm2, %xmm2
; CHECK-NEXT: vpxor %xmm2, %xmm1, %xmm1
; CHECK-NEXT: vptest %xmm1, %xmm0
; CHECK-NEXT: cmovnel %esi, %eax
; CHECK-NEXT: vptest %xmm0, %xmm1
; CHECK-NEXT: cmovael %esi, %eax
; CHECK-NEXT: retq
%t1 = xor <2 x i64> %d, <i64 -1, i64 -1>
%t2 = call i32 @llvm.x86.sse41.ptestz(<2 x i64> %c, <2 x i64> %t1)
@ -58,11 +56,8 @@ define i32 @ptestz_256_invert1(<4 x i64> %c, <4 x i64> %d, i32 %a, i32 %b) {
; CHECK-LABEL: ptestz_256_invert1:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: vxorps %xmm2, %xmm2, %xmm2
; CHECK-NEXT: vcmptrueps %ymm2, %ymm2, %ymm2
; CHECK-NEXT: vxorps %ymm2, %ymm1, %ymm1
; CHECK-NEXT: vptest %ymm1, %ymm0
; CHECK-NEXT: cmovnel %esi, %eax
; CHECK-NEXT: vptest %ymm0, %ymm1
; CHECK-NEXT: cmovael %esi, %eax
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: retq
%t1 = xor <4 x i64> %d, <i64 -1, i64 -1, i64 -1, i64 -1>

13
llvm/test/CodeGen/X86/combine-testpd.ll
View File

@ -46,10 +46,8 @@ define i32 @testpdz_128_invert1(<2 x double> %c, <2 x double> %d, i32 %a, i32 %b
; CHECK-LABEL: testpdz_128_invert1:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: vpcmpeqd %xmm2, %xmm2, %xmm2
; CHECK-NEXT: vpxor %xmm2, %xmm1, %xmm1
; CHECK-NEXT: vtestpd %xmm1, %xmm0
; CHECK-NEXT: cmovnel %esi, %eax
; CHECK-NEXT: vtestpd %xmm0, %xmm1
; CHECK-NEXT: cmovael %esi, %eax
; CHECK-NEXT: retq
%t0 = bitcast <2 x double> %d to <2 x i64>
%t1 = xor <2 x i64> %t0, <i64 -1, i64 -1>
@ -64,11 +62,8 @@ define i32 @testpdz_256_invert1(<4 x double> %c, <4 x double> %d, i32 %a, i32 %b
; CHECK-LABEL: testpdz_256_invert1:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: vxorps %xmm2, %xmm2, %xmm2
; CHECK-NEXT: vcmptrueps %ymm2, %ymm2, %ymm2
; CHECK-NEXT: vxorps %ymm2, %ymm1, %ymm1
; CHECK-NEXT: vtestpd %ymm1, %ymm0
; CHECK-NEXT: cmovnel %esi, %eax
; CHECK-NEXT: vtestpd %ymm0, %ymm1
; CHECK-NEXT: cmovael %esi, %eax
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: retq
%t0 = bitcast <4 x double> %d to <4 x i64>

13
llvm/test/CodeGen/X86/combine-testps.ll
View File

@ -46,10 +46,8 @@ define i32 @testpsz_128_invert1(<4 x float> %c, <4 x float> %d, i32 %a, i32 %b)
; CHECK-LABEL: testpsz_128_invert1:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: vpcmpeqd %xmm2, %xmm2, %xmm2
; CHECK-NEXT: vpxor %xmm2, %xmm1, %xmm1
; CHECK-NEXT: vtestps %xmm1, %xmm0
; CHECK-NEXT: cmovnel %esi, %eax
; CHECK-NEXT: vtestps %xmm0, %xmm1
; CHECK-NEXT: cmovael %esi, %eax
; CHECK-NEXT: retq
%t0 = bitcast <4 x float> %d to <2 x i64>
%t1 = xor <2 x i64> %t0, <i64 -1, i64 -1>
@ -64,11 +62,8 @@ define i32 @testpsz_256_invert1(<8 x float> %c, <8 x float> %d, i32 %a, i32 %b)
; CHECK-LABEL: testpsz_256_invert1:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: vxorps %xmm2, %xmm2, %xmm2
; CHECK-NEXT: vcmptrueps %ymm2, %ymm2, %ymm2
; CHECK-NEXT: vxorps %ymm2, %ymm1, %ymm1
; CHECK-NEXT: vtestps %ymm1, %ymm0
; CHECK-NEXT: cmovnel %esi, %eax
; CHECK-NEXT: vtestps %ymm0, %ymm1
; CHECK-NEXT: cmovael %esi, %eax
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: retq
%t0 = bitcast <8 x float> %d to <4 x i64>