diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp index 490bf5fb56c..32c0cbde3cf 100644 --- a/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp +++ b/llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp @@ -1933,6 +1933,15 @@ isProfitableToIfCvt(MachineBasicBlock &TBB, if (!TCycles) return false; + // In thumb code we often end up trading one branch for a IT block, and + // if we are cloning the instruction can increase code size. Prevent + // blocks with multiple predecesors from being ifcvted to prevent this + // cloning. + if (Subtarget.isThumb2() && TBB.getParent()->getFunction().hasMinSize()) { + if (TBB.pred_size() != 1 || FBB.pred_size() != 1) + return false; + } + // Attempt to estimate the relative costs of predication versus branching. // Here we scale up each component of UnpredCost to avoid precision issue when // scaling TCycles/FCycles by Probability. |
