diff options
Diffstat (limited to 'llvm/lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/BranchFolding.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp index 54d92ad67a9..c6a6476747e 100644 --- a/llvm/lib/CodeGen/BranchFolding.cpp +++ b/llvm/lib/CodeGen/BranchFolding.cpp @@ -1564,6 +1564,14 @@ ReoptimizeBlock: // removed, move this block to the end of the function. MachineBasicBlock *PrevTBB = nullptr, *PrevFBB = nullptr; SmallVector<MachineOperand, 4> PrevCond; + // We're looking for cases where PrevBB could possibly fall through to + // FallThrough, but if FallThrough is an EH pad that wouldn't be useful + // so here we skip over any EH pads so we might have a chance to find + // a branch target from PrevBB. + while (FallThrough != MF.end() && FallThrough->isEHPad()) + ++FallThrough; + // Now check to see if the current block is sitting between PrevBB and + // a block to which it could fall through. if (FallThrough != MF.end() && !TII->AnalyzeBranch(PrevBB, PrevTBB, PrevFBB, PrevCond, true) && PrevBB.isSuccessor(&*FallThrough)) { |
