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

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72764 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 14 insertions, 0 deletions

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 4b94bcfc43..cdb7e08056 100644
--- a/lib/Basic/Targets.cpp
+++ b/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;
   }
 }
 
diff --git a/test/Sema/asm-x86.c b/test/Sema/asm-x86.c
new file mode 100644
index 0000000000..d8fe38065f
--- /dev/null
+++ b/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}}
+}