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[X86] shouldScalarizeBinop - never scalarize target opcodes. 

We have (almost) no target opcodes that have scalar/vector equivalents - for now assume we can't scalarize them (we can add exceptions if we need to).

llvm-svn: 364429
This commit is contained in:
Simon Pilgrim 2019-06-26 14:21:29 +00:00
parent 5c94dd76d7
commit 24f96a0eee
1 changed files with 9 additions and 2 deletions
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11
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -4899,15 +4899,22 @@ bool X86TargetLowering::isExtractSubvectorCheap(EVT ResVT, EVT SrcVT,
}
bool X86TargetLowering::shouldScalarizeBinop(SDValue VecOp) const {
unsigned Opc = VecOp.getOpcode();
// Assume target opcodes can't be scalarized.
// TODO - do we have any exceptions?
if (Opc >= ISD::BUILTIN_OP_END)
return false;
// If the vector op is not supported, try to convert to scalar.
EVT VecVT = VecOp.getValueType();
if (!isOperationLegalOrCustomOrPromote(VecOp.getOpcode(), VecVT))
if (!isOperationLegalOrCustomOrPromote(Opc, VecVT))
return true;
// If the vector op is supported, but the scalar op is not, the transform may
// not be worthwhile.
EVT ScalarVT = VecVT.getScalarType();
return isOperationLegalOrCustomOrPromote(VecOp.getOpcode(), ScalarVT);
return isOperationLegalOrCustomOrPromote(Opc, ScalarVT);
}
bool X86TargetLowering::shouldFormOverflowOp(unsigned Opcode, EVT VT) const {