================
@@ -2892,13 +2892,19 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
if (!Constraints.empty())
Constraints += ',';
- // If this is a register output, then make the inline asm return it
- // by-value. If this is a memory result, return the value by-reference.
+ // - If this is a register output, then make the inline asm return it
+ // by-value.
+ // - If this is an "rm" constraint, then treat it like a register output.
+ // (We'll correct this before ISel if using the fast register allocator.)
+ // - If this is a memory result, return the value by-reference.
QualType QTy = OutExpr->getType();
const bool IsScalarOrAggregate = hasScalarEvaluationKind(QTy) ||
hasAggregateEvaluationKind(QTy);
- if (!Info.allowsMemory() && IsScalarOrAggregate) {
+ const bool RegisterMemoryConstraints =
+ OutputConstraint == "rm" || OutputConstraint == "mr";
----------------
nikic wrote:
Should avoid matching the constraint string directly. I think the right logic
here may be to replace !allowsMemory with allowsRegister?
https://github.com/llvm/llvm-project/pull/92040
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