From: Chris Lattner <sabre@nondot.org>
Date: Tue, 13 Oct 2009 04:32:07 +0000 (+0000)
Subject: fix PR4938 by recognizing % as a modifier on outputs,
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=4053983963cb94a6129da47bca8cce637c8b7bff;p=clang

fix PR4938 by recognizing % as a modifier on outputs,
previously we only recognized it on inputs.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@83939 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Basic/TargetInfo.cpp b/lib/Basic/TargetInfo.cpp
index 35d9ccd401..9cd12493e7 100644
--- a/lib/Basic/TargetInfo.cpp
+++ b/lib/Basic/TargetInfo.cpp
@@ -188,6 +188,9 @@ bool TargetInfo::validateOutputConstraint(ConstraintInfo &Info) const {
       }
     case '&': // early clobber.
       break;
+    case '%': // commutative.
+      // FIXME: Check that there is a another register after this one.
+      break;
     case 'r': // general register.
       Info.setAllowsRegister();
       break;
diff --git a/test/CodeGen/asm.c b/test/CodeGen/asm.c
index 46563213b1..52afc91527 100644
--- a/test/CodeGen/asm.c
+++ b/test/CodeGen/asm.c
@@ -101,3 +101,12 @@ void t14(struct S *P) {
 }
 
 
+// PR4938
+int t16() {
+  int a,b;
+  asm ( "nop;"
+       :"=%c" (a)
+       : "r" (b)
+       );
+  return 0;
+}