STATISTIC(NumDeadBlocks, "Number of dead blocks removed");
STATISTIC(NumAddedPHIs, "Number of phis added");
+namespace llvm {
+
// Heuristic for tail duplication.
static cl::opt<unsigned> TailDuplicateSize(
"tail-dup-size",
cl::desc("Maximum instructions to consider tail duplicating"), cl::init(2),
cl::Hidden);
+cl::opt<unsigned> TailDupIndirectBranchSize(
+ "tail-dup-indirect-size",
+ cl::desc("Maximum instructions to consider tail duplicating blocks that "
+ "end with indirect branches."), cl::init(20),
+ cl::Hidden);
+
static cl::opt<bool>
TailDupVerify("tail-dup-verify",
cl::desc("Verify sanity of PHI instructions during taildup"),
static cl::opt<unsigned> TailDupLimit("tail-dup-limit", cl::init(~0U),
cl::Hidden);
-namespace llvm {
-
void TailDuplicator::initMF(MachineFunction &MFin,
const MachineBranchProbabilityInfo *MBPIin,
unsigned TailDupSizeIn) {
HasIndirectbr = TailBB.back().isIndirectBranch();
if (HasIndirectbr && PreRegAlloc)
- MaxDuplicateCount = 20;
+ MaxDuplicateCount = TailDupIndirectBranchSize;
// Check the instructions in the block to determine whether tail-duplication
// is invalid or unlikely to be profitable.