PR3678: Add support for "Yt" asm register constraint.

llvm-svn: 72764

clang/lib/Basic/Targets.cpp

@@ -754,6 +754,13 @@ X86TargetInfo::validateAsmConstraint(const char *&Name,
             // instructions.
     Info.setAllowsRegister();
     return true;
+  case 'Y':
+    ++Name;
+    if (*Name == 't') {
+      Info.setAllowsRegister();
+      return true;
+    }
+    return false;
   }
 }
 

clang/test/Sema/asm-x86.c

@@ -0,0 +1,7 @@
+// RUN: clang-cc %s -triple i386-pc-linux-gnu -target-feature=+sse2 -verify -fsyntax-only
+
+// PR3678
+int test8() {
+  asm("%0" : : "Yt"(1.0));
+  asm("%0" : : "Yy"(1.0)); // expected-error {{invalid input constraint 'Yy' in asm}}
+}