diff options
Diffstat (limited to 'lib/CodeGen/BranchFolding.cpp')
| -rw-r--r-- | lib/CodeGen/BranchFolding.cpp | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/CodeGen/BranchFolding.cpp b/lib/CodeGen/BranchFolding.cpp index d344af06fd..94bfb7204b 100644 --- a/lib/CodeGen/BranchFolding.cpp +++ b/lib/CodeGen/BranchFolding.cpp @@ -1033,12 +1033,13 @@ bool BranchFolder::TailDuplicate(MachineBasicBlock *TailBB, if (TailBB->isSuccessor(TailBB)) return false; - // Duplicate up to one less than the tail-merge threshold. When optimizing - // for size, duplicate only one, because one branch instruction can be - // eliminated to compensate for the duplication. + // Set the limit on the number of instructions to duplicate, with a default + // of one less than the tail-merge threshold. When optimizing for size, + // duplicate only one, because one branch instruction can be eliminated to + // compensate for the duplication. unsigned MaxDuplicateCount = MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize) ? - 1 : (TailMergeSize - 1); + 1 : TII->TailDuplicationLimit(*TailBB, TailMergeSize - 1); // Check the instructions in the block to determine whether tail-duplication // is invalid or unlikely to be profitable. |