================
@@ -474,6 +474,10 @@ AsmStmt::addVariableConstraints(StringRef Constraint,
const Expr &AsmExpr,
return Constraint.str();
StringRef Register = Attr->getLabel();
assert(Target.isValidGCCRegisterName(Register));
+ // Preserve matching constraints instead of replacing them with the
+ // register variable's fixed register.
+ if (Constraint[0] == '%' || isdigit(Constraint[0]))
----------------
efriedma-quic wrote:
Can we use hasTiedOperand()?
https://github.com/llvm/llvm-project/pull/216596
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