From a31b0c0ece352e7ba31a65f155e9252647c2b1cd Mon Sep 17 00:00:00 2001
From: Sanjay Patel <spatel@rotateright.com>
Date: Tue, 26 Apr 2016 00:47:39 +0000
Subject: [CodeGenPrepare] don't convert an unpredictable select into control
 flow

Suggested in the review of D19488:
http://reviews.llvm.org/D19488

llvm-svn: 267504
---
 llvm/lib/CodeGen/CodeGenPrepare.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen/CodeGenPrepare.cpp')

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 9ba93a956fa..659b0c572fb 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -4568,7 +4568,8 @@ bool CodeGenPrepare::optimizeSelectInst(SelectInst *SI) {
   bool VectorCond = !SI->getCondition()->getType()->isIntegerTy(1);
 
   // Can we convert the 'select' to CF ?
-  if (DisableSelectToBranch || OptSize || !TLI || VectorCond)
+  if (DisableSelectToBranch || OptSize || !TLI || VectorCond ||
+      SI->getMetadata(LLVMContext::MD_unpredictable))
     return false;
 
   TargetLowering::SelectSupportKind SelectKind;
-- 
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