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Use local assertion prop to omit casts on returns #55632

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Jul 15, 2021
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Use local assertion prop to omit casts on returns #55632

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7 changes: 3 additions & 4 deletions src/coreclr/jit/morph.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11478,7 +11478,7 @@ GenTree* Compiler::fgMorphSmpOp(GenTree* tree, MorphAddrContext* mac)

case GT_RETURN:
// normalize small integer return values
if (fgGlobalMorph && varTypeIsSmall(info.compRetType) && (op1 != nullptr) && (op1->TypeGet() != TYP_VOID) &&
if (fgGlobalMorph && varTypeIsSmall(info.compRetType) && (op1 != nullptr) && !op1->TypeIs(TYP_VOID) &&
fgCastNeeded(op1, info.compRetType))
{
// Small-typed return values are normalized by the callee
Expand All @@ -11487,11 +11487,10 @@ GenTree* Compiler::fgMorphSmpOp(GenTree* tree, MorphAddrContext* mac)
// Propagate GTF_COLON_COND
op1->gtFlags |= (tree->gtFlags & GTF_COLON_COND);

tree->AsOp()->gtOp1 = fgMorphCast(op1);
tree->AsOp()->gtOp1 = fgMorphTree(op1);

// Propagate side effect flags
tree->gtFlags &= ~GTF_ALL_EFFECT;
tree->gtFlags |= (tree->AsOp()->gtOp1->gtFlags & GTF_ALL_EFFECT);
tree->SetAllEffectsFlags(tree->AsOp()->gtGetOp1());

return tree;
}
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