CodeGen: Simplify consecutive '%' modifiers

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

llvm-svn: 225602

2 files changed, 10 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index d910f2fb969..bd48227b15c 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/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/clang/test/CodeGen/asm.c b/clang/test/CodeGen/asm.c
index c64f83f7877..038d346e999 100644
--- a/clang/test/CodeGen/asm.c
+++ b/clang/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}"
+}