From: Max Kazantsev <max.kazantsev@azul.com>
Date: Thu, 14 Feb 2019 11:10:29 +0000 (+0000)
Subject: Make widenable condition transparent for MemoryWriteTracking
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d9bd97c13210f6d20edf4e95048af133ddb327ae;p=llvm

Make widenable condition transparent for MemoryWriteTracking

Side effects of widenable condition intrinsic are modelled via
InaccessibleMemOnly, and there is no way to say that it isn't
really writing any memory. This patch teaches MemoryWriteTracking
ignore this intrinsic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@354021 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/InstructionPrecedenceTracking.cpp b/lib/Analysis/InstructionPrecedenceTracking.cpp
index 0afce7ebbd3..35190ce3e11 100644
--- a/lib/Analysis/InstructionPrecedenceTracking.cpp
+++ b/lib/Analysis/InstructionPrecedenceTracking.cpp
@@ -19,6 +19,7 @@
 
 #include "llvm/Analysis/InstructionPrecedenceTracking.h"
 #include "llvm/Analysis/ValueTracking.h"
+#include "llvm/IR/PatternMatch.h"
 
 using namespace llvm;
 
@@ -152,5 +153,8 @@ bool ImplicitControlFlowTracking::isSpecialInstruction(
 
 bool MemoryWriteTracking::isSpecialInstruction(
     const Instruction *Insn) const {
+  using namespace PatternMatch;
+  if (match(Insn, m_Intrinsic<Intrinsic::experimental_widenable_condition>()))
+    return false;
   return Insn->mayWriteToMemory();
 }