From: Chris Lattner <sabre@nondot.org>
Date: Sun, 1 Nov 2009 03:42:55 +0000 (+0000)
Subject: if CostMetrics says to never duplicate some code, don't unswitch a loop.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=da9c281121537d9823ddeecf7bb15095d95b2722;p=oota-llvm.git

if CostMetrics says to never duplicate some code, don't unswitch a loop.
This prevents unswitching from duplicating indbr's.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85705 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/LoopUnswitch.cpp b/lib/Transforms/Scalar/LoopUnswitch.cpp
index 223d2b9869c..c7b00da159c 100644
--- a/lib/Transforms/Scalar/LoopUnswitch.cpp
+++ b/lib/Transforms/Scalar/LoopUnswitch.cpp
@@ -430,7 +430,8 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){
     // large numbers of branches which cause loop unswitching to go crazy.
     // This is a very ad-hoc heuristic.
     if (Metrics.NumInsts > Threshold ||
-        Metrics.NumBlocks * 5 > Threshold) {
+        Metrics.NumBlocks * 5 > Threshold ||
+        Metrics.NeverInline) {
       DEBUG(errs() << "NOT unswitching loop %"
             << currentLoop->getHeader()->getName() << ", cost too high: "
             << currentLoop->getBlocks().size() << "\n");