Canonicalize register names properly.

Fixes rdar://9425559

llvm-svn: 133486

Author: echristo

clang/lib/CodeGen/CGStmt.cpp

@@ -1286,6 +1286,8 @@ AddVariableConstraints(const std::string &Constraint, const Expr &AsmExpr,
     CGM.ErrorUnsupported(&Stmt, "__asm__");
     return Constraint;
   }
+  // Canonicalize the register here before returning it.
+  Register = Target.getNormalizedGCCRegisterName(Register);
   return "{" + Register.str() + "}";
 }
 

clang/test/CodeGen/arm-asm-variable.c

@@ -20,3 +20,12 @@ int64_t foo(int64_t v, volatile int64_t *p)
 
   return r;
 }
+
+// Make sure we translate register names properly.
+void bar (void) {
+  register unsigned int rn asm("r14");
+  register unsigned int d asm("r2");
+
+  // CHECK: call i32 asm sideeffect "sub $1, $1, #32", "={r2},{lr}"
+  asm volatile ("sub %1, %1, #32" : "=r"(d) : "r"(rn));
+}