From 55164f901b04a0c06a9d63a582525a115984fb42 Mon Sep 17 00:00:00 2001
From: David Majnemer <david.majnemer@gmail.com>
Date: Sun, 11 Jan 2015 09:57:13 +0000
Subject: Basic: [asmSymbolicName] follows the same rule as numbers in asm
 inputs

Input constraints like "0" and "[foo]" should be treated the same when
it comes to their corresponding output constraint.

This fixes PR21850.

llvm-svn: 225605
---
 clang/lib/Basic/TargetInfo.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'clang/lib/Basic/TargetInfo.cpp')

diff --git a/clang/lib/Basic/TargetInfo.cpp b/clang/lib/Basic/TargetInfo.cpp
index 15b8c83d1b3..535c87ec115 100644
--- a/clang/lib/Basic/TargetInfo.cpp
+++ b/clang/lib/Basic/TargetInfo.cpp
@@ -583,6 +583,10 @@ bool TargetInfo::validateInputConstraint(ConstraintInfo *OutputConstraints,
       if (Info.hasTiedOperand() && Info.getTiedOperand() != Index)
         return false;
 
+      // A number must refer to an output only operand.
+      if (OutputConstraints[Index].isReadWrite())
+        return false;
+
       Info.setTiedOperand(Index, OutputConstraints[Index]);
       break;
     }
-- 
cgit v1.2.3