From 4b105912657c0472dc4f6f7244ce20bf7cf9a7dc Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sat, 18 Nov 2006 22:25:39 +0000 Subject: [PATCH] Don't transform in another bad case: if the block is empty, it should be 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 --- lib/CodeGen/BranchFolding.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index c69930da81e..8ded3cdc64d 100644 --- a/lib/CodeGen/BranchFolding.cpp +++ b/lib/CodeGen/BranchFolding.cpp @@ -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;