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Don't transform in another bad case: if the block is empty, it should be

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simplified before we do this xform so that our cost model is accurate.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31864 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-11-18 22:25:39 +00:00
parent f10a56a86f
commit 4b10591265
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/BranchFolding.cpp
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@ -729,7 +729,8 @@ void BranchFolder::OptimizeBlock(MachineBasicBlock *MBB) {
//
// In this case, we could actually be moving the return block *into* a
// loop!
if (DoTransform && !MBB->succ_empty() && !CanFallThrough(PriorTBB))
if (DoTransform && !MBB->succ_empty() &&
(!CanFallThrough(PriorTBB) || PriorTBB->empty()))
DoTransform = false;