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Remove forward-sub for hw intrinsics during inlining #62883

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Dec 17, 2021
Merged

Remove forward-sub for hw intrinsics during inlining #62883

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29 changes: 2 additions & 27 deletions src/coreclr/jit/importer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20838,33 +20838,8 @@ GenTree* Compiler::impInlineFetchArg(unsigned lclNum, InlArgInfo* inlArgInfo, In
// TODO-1stClassStructs: We currently do not reuse an existing lclVar
// if it is a struct, because it requires some additional handling.

bool substitute = false;
switch (argNode->OperGet())
{
#ifdef FEATURE_HW_INTRINSICS
case GT_HWINTRINSIC:
{
// Enable for all parameterless (=invariant) hw intrinsics such as
// Vector128<>.Zero and Vector256<>.AllBitSets. We might consider
// doing that for Vector.Create(cns) as well.
if (argNode->AsHWIntrinsic()->GetOperandCount() == 0)
{
substitute = true;
}
break;
}
#endif

// TODO: Enable substitution for CORINFO_HELP_TYPEHANDLE_TO_RUNTIMETYPE (typeof(T))
// but in order to benefit from that, we need to move various "typeof + IsValueType"
// optimizations from importer to morph.

default:
break;
}

if (substitute || (!varTypeIsStruct(lclTyp) && !argInfo.argHasSideEff && !argInfo.argHasGlobRef &&
!argInfo.argHasCallerLocalRef))
if ((!varTypeIsStruct(lclTyp) && !argInfo.argHasSideEff && !argInfo.argHasGlobRef &&
!argInfo.argHasCallerLocalRef))
{
/* Get a *LARGE* LCL_VAR node */
op1 = gtNewLclLNode(tmpNum, genActualType(lclTyp) DEBUGARG(lclNum));
Expand Down