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If "optimize for size" attribute is set then block non-trivial loop unswitches but allow trivial loop unswitches.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63670 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -430,9 +430,6 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){
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initLoopData();
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Function *F = loopHeader->getParent();
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// Do not unswitch if the function is optimized for size.
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if (!F->isDeclaration() && F->hasFnAttr(Attribute::OptimizeForSize))
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return false;
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// Check to see if it would be profitable to unswitch current loop.
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unsigned Cost = getLoopUnswitchCost(LoopCond);
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@ -440,6 +437,8 @@ bool LoopUnswitch::UnswitchIfProfitable(Value *LoopCond, Constant *Val){
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// Do not do non-trivial unswitch while optimizing for size.
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if (Cost && OptimizeForSize)
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return false;
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if (Cost && !F->isDeclaration() && F->hasFnAttr(Attribute::OptimizeForSize))
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return false;
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if (Cost > Threshold) {
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// FIXME: this should estimate growth by the amount of code shared by the
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