[llvm] r251991 - InstCombine: fix sinking of convergent calls

[Fiona Glaser via llvm-commits]

Author: escha
Date: Tue Nov  3 16:23:39 2015
New Revision: 251991

URL: http://llvm.org/viewvc/llvm-project?rev=251991&view=rev
Log:
InstCombine: fix sinking of convergent calls

Modified:
    llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp

Modified: llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp?rev=251991&r1=251990&r2=251991&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstructionCombining.cpp Tue Nov  3 16:23:39 2015
@@ -2694,6 +2694,12 @@ static bool TryToSinkInstruction(Instruc
         &DestBlock->getParent()->getEntryBlock())
     return false;
 
+  // Do not sink convergent call instructions.
+  if (auto *CI = dyn_cast<CallInst>(I)) {
+    if (CI->isConvergent())
+      return false;
+  }
+
   // We can only sink load instructions if there is nothing between the load and
   // the end of block that could change the value.
   if (I->mayReadFromMemory()) {