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If "optimize for size" attribute is set then block non-trivial loop unswitches but allow trivial loop unswitches.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63670 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2009-02-03 22:04:27 +00:00
parent d839254888
commit 28aa5de050
1 changed files with 2 additions and 3 deletions
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5
lib/Transforms/Scalar/LoopUnswitch.cpp
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@ -430,9 +430,6 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){
initLoopData();
Function *F = loopHeader->getParent();
// Do not unswitch if the function is optimized for size.
if (!F->isDeclaration() && F->hasFnAttr(Attribute::OptimizeForSize))
return false;
// Check to see if it would be profitable to unswitch current loop.
unsigned Cost = getLoopUnswitchCost(LoopCond);
@ -440,6 +437,8 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){
// Do not do non-trivial unswitch while optimizing for size.
if (Cost && OptimizeForSize)
return false;
if (Cost && !F->isDeclaration() && F->hasFnAttr(Attribute::OptimizeForSize))
return false;
if (Cost > Threshold) {
// FIXME: this should estimate growth by the amount of code shared by the