From 3c85eef81a13d6a2943562e5953a73a6ef6684c0 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sun, 18 Apr 2004 00:52:43 +0000 Subject: [PATCH] Make the tail duplication threshold accessible from the command line instead of hardcoded git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13025 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/TailDuplication.cpp | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp index 40821e450c6..b6870841fe2 100644 --- a/lib/Transforms/Scalar/TailDuplication.cpp +++ b/lib/Transforms/Scalar/TailDuplication.cpp @@ -28,11 +28,15 @@ #include "llvm/Support/CFG.h" #include "llvm/Support/ValueHolder.h" #include "llvm/Transforms/Utils/Local.h" +#include "Support/CommandLine.h" #include "Support/Debug.h" #include "Support/Statistic.h" using namespace llvm; namespace { + cl::opt + Threshold("taildup-threshold", cl::desc("Max block size to tail duplicate"), + cl::init(6), cl::Hidden); Statistic<> NumEliminated("tailduplicate", "Number of unconditional branches eliminated"); Statistic<> NumPHINodes("tailduplicate", "Number of phi nodes inserted"); @@ -106,7 +110,7 @@ bool TailDup::shouldEliminateUnconditionalBranch(TerminatorInst *TI) { while (isa(*I)) ++I; for (unsigned Size = 0; I != Dest->end(); ++Size, ++I) - if (Size == 6) return false; // The block is too large... + if (Size == Threshold) return false; // The block is too large... // Do not tail duplicate a block that has thousands of successors into a block // with a single successor if the block has many other predecessors. This can