diff options
Diffstat (limited to 'llvm/lib/CodeGen/Passes.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/Passes.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/Passes.cpp b/llvm/lib/CodeGen/Passes.cpp index f4ffd03ec3e..db7021372bc 100644 --- a/llvm/lib/CodeGen/Passes.cpp +++ b/llvm/lib/CodeGen/Passes.cpp @@ -725,7 +725,10 @@ void TargetPassConfig::addMachineLateOptimization() { printAndVerify("After BranchFolding"); // Tail duplication. - if (addPass(&TailDuplicateID)) + // Note that duplicating tail just increases code size and degrades + // performance for targets that require Structured Control Flow. + // In addition it can also make CFG irreducible. Thus we disable it. + if (!TM->requiresStructuredCFG() && addPass(&TailDuplicateID)) printAndVerify("After TailDuplicate"); // Copy propagation. |
