1 files changed, 3 insertions, 1 deletions
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 3c076ca4f03..6a30ca84764 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -3365,6 +3365,7 @@ public:
                                           const char Modifier,
                                           unsigned Size) const {
     bool isOutput = (Constraint[0] == '=');
+    bool isInOut = (Constraint[0] == '+');
 
     // Strip off constraint modifiers.
     while (Constraint[0] == '=' ||
@@ -3377,7 +3378,8 @@ public:
     case 'r': {
       switch (Modifier) {
       default:
-        return (isOutput && Size >= 32) || Size <= 32;
+        return isInOut || (isOutput && Size >= 32) ||
+          (!isOutput && !isInOut && Size <= 32);
       case 'q':
         // A register of size 32 cannot fit a vector type.
         return false;