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[X86] Simplify ReplaceNodeResults handling for SIGN_EXTEND/ZERO_EXTEND/TRUNCATE for vectors to only handle widening.

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llvm-svn: 368386
This commit is contained in:
Craig Topper 2019-08-09 03:08:54 +00:00
parent 01bccc836d
commit ec46fe9e92
1 changed files with 5 additions and 4 deletions
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9
lib/Target/X86/X86ISelLowering.cpp
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@ -27633,8 +27633,8 @@ void X86TargetLowering::ReplaceNodeResults(SDNode *N,
}
case ISD::TRUNCATE: {
MVT VT = N->getSimpleValueType(0);
if (getTypeAction(*DAG.getContext(), VT) != TypeWidenVector)
return;
assert(getTypeAction(*DAG.getContext(), VT) == TypeWidenVector &&
"Unexpected type action!");
// The generic legalizer will try to widen the input type to the same
// number of elements as the widened result type. But this isn't always
@ -27688,8 +27688,9 @@ void X86TargetLowering::ReplaceNodeResults(SDNode *N,
SDValue In = N->getOperand(0);
EVT InVT = In.getValueType();
if (!Subtarget.hasSSE41() && VT == MVT::v4i64 &&
(InVT == MVT::v4i16 || InVT == MVT::v4i8) &&
getTypeAction(*DAG.getContext(), InVT) == TypeWidenVector) {
(InVT == MVT::v4i16 || InVT == MVT::v4i8)){
assert(getTypeAction(*DAG.getContext(), InVT) == TypeWidenVector &&
"Unexpected type action!");
assert(N->getOpcode() == ISD::SIGN_EXTEND && "Unexpected opcode");
// Custom split this so we can extend i8/i16->i32 invec. This is better
// since sign_extend_inreg i8/i16->i64 requires an extend to i32 using