Check that the input size is correct for the given constraint.

The 'a', 'c', and 'd' constraints on i386 mean a 32-bit register. We cannot
place a 64-bit value into the 32-bit register. Error out instead of causing the
compiler to spew general badness.
<rdar://problem/12415959>


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@167717 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 0 deletions

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 26a4f41442..ea4ac27a35 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -2595,6 +2595,19 @@ public:
     if (RegNo == 1) return 2;
     return -1;
   }
+  virtual bool validateInputSize(StringRef Constraint,
+                                 unsigned Size) const {
+    switch (Constraint[0]) {
+    default: break;
+    case 'a':
+    case 'b':
+    case 'c':
+    case 'd':
+      return Size == 32;
+    }
+
+    return true;
+  }
 };
 } // end anonymous namespace