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[X86][SSE] Add X86ISD::FRCP handling to isNegatibleForFree 

Peek through X86ISD::FRCP nodes to see if there is a negatible input.
This commit is contained in:
Simon Pilgrim 2020-02-08 10:56:27 +00:00
parent 63e338be2c
commit 7f5b3fa73c
2 changed files with 10 additions and 4 deletions
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8
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -42941,6 +42941,9 @@ char X86TargetLowering::isNegatibleForFree(SDValue Op, SelectionDAG &DAG,
}
return 1;
}
case X86ISD::FRCP:
return isNegatibleForFree(Op.getOperand(0), DAG, LegalOperations,
ForCodeSize, Depth + 1);
}
return TargetLowering::isNegatibleForFree(Op, DAG, LegalOperations,
@ -42994,6 +42997,11 @@ SDValue X86TargetLowering::getNegatedExpression(SDValue Op, SelectionDAG &DAG,
NewOps[i] = Op.getOperand(i);
return DAG.getNode(NewOpc, SDLoc(Op), VT, NewOps);
}
case X86ISD::FRCP:
return DAG.getNode(Opc, SDLoc(Op), VT,
getNegatedExpression(Op.getOperand(0), DAG,
LegalOperations, ForCodeSize,
Depth + 1));
}
return TargetLowering::getNegatedExpression(Op, DAG, LegalOperations,

6
llvm/test/CodeGen/X86/fma-fneg-combine-2.ll
View File

@ -89,16 +89,14 @@ entry:
define <4 x float> @test_fma_rcp_fneg_v4f32(<4 x float> %x, <4 x float> %y, <4 x float> %z) {
; FMA3-LABEL: test_fma_rcp_fneg_v4f32:
; FMA3: # %bb.0: # %entry
; FMA3-NEXT: vxorps {{.*}}(%rip), %xmm2, %xmm2
; FMA3-NEXT: vrcpps %xmm2, %xmm2
; FMA3-NEXT: vfmadd213ps {{.*#+}} xmm0 = (xmm1 * xmm0) + xmm2
; FMA3-NEXT: vfmsub213ps {{.*#+}} xmm0 = (xmm1 * xmm0) - xmm2
; FMA3-NEXT: retq
;
; FMA4-LABEL: test_fma_rcp_fneg_v4f32:
; FMA4: # %bb.0: # %entry
; FMA4-NEXT: vxorps {{.*}}(%rip), %xmm2, %xmm2
; FMA4-NEXT: vrcpps %xmm2, %xmm2
; FMA4-NEXT: vfmaddps %xmm2, %xmm1, %xmm0, %xmm0
; FMA4-NEXT: vfmsubps %xmm2, %xmm1, %xmm0, %xmm0
; FMA4-NEXT: retq
entry:
%0 = fneg <4 x float> %z