[WinEH] Fix problem where CodeGenPrepare incorrectly sinks a bitcast into an EH pad.

Differential Revision: http://reviews.llvm.org/D14842

llvm-svn: 253902

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index ce6308dd709..d619044e86c 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -730,6 +730,12 @@ static bool SinkCast(CastInst *CI) {
     // Preincrement use iterator so we don't invalidate it.
     ++UI;
 
+    // If the block selected to receive the cast is an EH pad that does not
+    // allow non-PHI instructions before the terminator, we can't sink the
+    // cast.
+    if (UserBB->getTerminator()->isEHPad())
+      continue;
+
     // If this user is in the same block as the cast, don't change the cast.
     if (UserBB == DefBB) continue;