[PATCH] D17430: [ifcvn] Don't duplicate blocks containing convergent instructions.

[Justin Lebar via llvm-commits]

jlebar created this revision.
jlebar added a reviewer: echristo.
jlebar added subscribers: llvm-commits, tra.

No test, because the two archs that have convergent MIs, nvptx and
amdgcn, don't enable ifcvn.

http://reviews.llvm.org/D17430

Files:
  lib/CodeGen/IfConversion.cpp

Index: lib/CodeGen/IfConversion.cpp
===================================================================
--- lib/CodeGen/IfConversion.cpp
+++ lib/CodeGen/IfConversion.cpp
@@ -679,7 +679,7 @@
     if (I->isDebugValue())
       continue;
 
-    if (I->isNotDuplicable())
+    if (I->isNotDuplicable() || I->isConvergent())
       BBI.CannotBeCopied = true;
 
     bool isPredicated = TII->isPredicated(I);


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