<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Committed in r228995.<div class=""><br class=""></div><div class="">Michael<br class=""><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Feb 12, 2015, at 4:24 PM, David Majnemer <<a href="mailto:david.majnemer@gmail.com" class="">david.majnemer@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Testcase?</div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Thu, Feb 12, 2015 at 4:17 PM, Michael Zolotukhin <span dir="ltr" class=""><<a href="mailto:mzolotukhin@apple.com" target="_blank" class="">mzolotukhin@apple.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Author: mzolotukhin<br class="">
Date: Thu Feb 12 18:17:03 2015<br class="">
New Revision: 228988<br class="">
<br class="">
URL: <a href="http://llvm.org/viewvc/llvm-project?rev=228988&view=rev" target="_blank" class="">http://llvm.org/viewvc/llvm-project?rev=228988&view=rev</a><br class="">
Log:<br class="">
Prevent division by 0.<br class="">
<br class="">
When we try to estimate number of potentially removed instructions in<br class="">
loop unroller, we analyze first N iterations and then scale the<br class="">
computed number by TripCount/N. We should bail out early if N is 0.<br class="">
<br class="">
Modified:<br class="">
llvm/trunk/lib/Transforms/Scalar/LoopUnrollPass.cpp<br class="">
<br class="">
Modified: llvm/trunk/lib/Transforms/Scalar/LoopUnrollPass.cpp<br class="">
URL: <a href="http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopUnrollPass.cpp?rev=228988&r1=228987&r2=228988&view=diff" target="_blank" class="">http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/LoopUnrollPass.cpp?rev=228988&r1=228987&r2=228988&view=diff</a><br class="">
==============================================================================<br class="">
--- llvm/trunk/lib/Transforms/Scalar/LoopUnrollPass.cpp (original)<br class="">
+++ llvm/trunk/lib/Transforms/Scalar/LoopUnrollPass.cpp Thu Feb 12 18:17:03 2015<br class="">
@@ -548,7 +548,7 @@ static unsigned<br class="">
approximateNumberOfOptimizedInstructions(const Loop *L, ScalarEvolution &SE,<br class="">
unsigned TripCount,<br class="">
const TargetTransformInfo &TTI) {<br class="">
- if (!TripCount)<br class="">
+ if (!TripCount || !UnrollMaxIterationsCountToAnalyze)<br class="">
return 0;<br class="">
<br class="">
UnrollAnalyzer UA(L, TripCount, SE, TTI);<br class="">
<br class="">
<br class="">
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