From 1f6ca0ba1568acbb293a3cf5b3723af92013585d Mon Sep 17 00:00:00 2001
From: Gabor Buella <gabor.buella@intel.com>
Date: Thu, 25 Oct 2018 08:32:29 +0000
Subject: Add -instcombine-code-sinking option

Reviewers: craig.topper, andrew.w.kaylor, efriedma

Reviewed By: craig.topper, andrew.w.kaylor, efriedma

Differential Revision: https://reviews.llvm.org/D52709

llvm-svn: 345248
---
 llvm/lib/Transforms/InstCombine/InstructionCombining.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/Transforms/InstCombine/InstructionCombining.cpp')

diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 34a5e1955b6..8506cf9baee 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -119,6 +119,10 @@ STATISTIC(NumReassoc  , "Number of reassociations");
 DEBUG_COUNTER(VisitCounter, "instcombine-visit",
               "Controls which instructions are visited");
 
+static cl::opt<bool>
+EnableCodeSinking("instcombine-code-sinking", cl::desc("Enable code sinking"),
+                                              cl::init(true));
+
 static cl::opt<bool>
 EnableExpensiveCombines("expensive-combines",
                         cl::desc("Enable expensive instruction combines"));
@@ -3103,7 +3107,7 @@ bool InstCombiner::run() {
     }
 
     // See if we can trivially sink this instruction to a successor basic block.
-    if (I->hasOneUse()) {
+    if (EnableCodeSinking && I->hasOneUse()) {
       BasicBlock *BB = I->getParent();
       Instruction *UserInst = cast<Instruction>(*I->user_begin());
       BasicBlock *UserParent;
-- 
cgit v1.2.3