Add support for the 'Q' arm memory constraint.

Fixes rdar://9866494

llvm-svn: 136524

clang/lib/Basic/Targets.cpp

@@ -2137,6 +2137,9 @@ public:
     case 'P': // VFP Floating point register double precision
       Info.setAllowsRegister();
       return true;
+    case 'Q': // A memory address that is a single base register.
+      Info.setAllowsMemory();
+      return true;
     case 'U': // a memory reference...
       switch (Name[1]) {
       case 'q': // ...ARMV4 ldrsb

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

@@ -0,0 +1,6 @@
+// RUN: %clang_cc1 -triple armv7-apple-darwin9 -emit-llvm -w -o - %s | FileCheck %s
+
+void t1 (void *f, int g) {
+  // CHECK: call void asm "str $1, $0", "=*Q,r"
+  asm("str %1, %0" : "=Q"(f) : "r"(g));
+}