diff options
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 88870e51f45..c9087235ce8 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -70,6 +70,13 @@ static cl::opt<bool> ExperimentalVectorWideningLegalization( "rather than promotion."), cl::Hidden); +static cl::opt<int> ExperimentalPrefLoopAlignment( + "x86-experimental-pref-loop-alignment", cl::init(4), + cl::desc("Sets the preferable loop alignment for experiments " + "(the last x86-experimental-pref-loop-alignment bits" + " of the loop header PC will be 0)."), + cl::Hidden); + X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM, const X86Subtarget &STI) : TargetLowering(TM), Subtarget(STI) { @@ -1724,7 +1731,8 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM, MaxStoresPerMemcpyOptSize = 4; MaxStoresPerMemmove = 8; // For @llvm.memmove -> sequence of stores MaxStoresPerMemmoveOptSize = 4; - setPrefLoopAlignment(4); // 2^4 bytes. + // Set loop alignment to 2^ExperimentalPrefLoopAlignment bytes (default: 2^4). + setPrefLoopAlignment(ExperimentalPrefLoopAlignment); // An out-of-order CPU can speculatively execute past a predictable branch, // but a conditional move could be stalled by an expensive earlier operation. |
