From: David Majnemer <david.majnemer@gmail.com>
Date: Sun, 11 Jan 2015 09:13:56 +0000 (+0000)
Subject: CodeGen: Simplify consecutive '%' modifiers
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0dcea0929b62ed8ecbf426f22599d84bb0fa26ad;p=clang

CodeGen: Simplify consecutive '%' modifiers

LLVM the consecutive '%' modifiers are redundant, skip them.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@225602 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index d910f2fb96..bd48227b15 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -1660,8 +1660,9 @@ SimplifyConstraint(const char *Constraint, const TargetInfo &Target,
         Constraint++;
       break;
     case '&':
-      Result += '&';
-      while (Constraint[1] && Constraint[1] == '&')
+    case '%':
+      Result += *Constraint;
+      while (Constraint[1] && Constraint[1] == *Constraint)
         Constraint++;
       break;
     case ',':
diff --git a/test/CodeGen/asm.c b/test/CodeGen/asm.c
index c64f83f787..038d346e99 100644
--- a/test/CodeGen/asm.c
+++ b/test/CodeGen/asm.c
@@ -255,3 +255,10 @@ void t30(int len) {
   // CHECK: @t30
   // CHECK: call void asm sideeffect "", "=*&rm,0,~{dirflag},~{fpsr},~{flags}"
 }
+
+void t31(int len) {
+  __asm__ volatile(""
+                   : "+%%rm"(len), "+rm"(len));
+  // CHECK: @t31
+  // CHECK: call void asm sideeffect "", "=*%rm,=*rm,0,1,~{dirflag},~{fpsr},~{flags}"
+}