Check the specific target to figure out if a constraint is a valid
register constraint. Note that we're not checking if the register itself
is valid for the constraint.
Fixes rdar://9382985
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@133226 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index 187d5a6..86b9e2b 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -1278,8 +1278,11 @@
return Constraint;
llvm::StringRef Register = Attr->getLabel();
assert(Target.isValidGCCRegisterName(Register));
- // FIXME: We should check which registers are compatible with "r" or "x".
- if (Constraint != "r" && Constraint != "x") {
+ // We're using validateOutputConstraint here because we only care if
+ // this is a register constraint.
+ TargetInfo::ConstraintInfo Info(Constraint, "");
+ if (Target.validateOutputConstraint(Info) &&
+ !Info.allowsRegister()) {
CGM.ErrorUnsupported(&Stmt, "__asm__");
return Constraint;
}