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author | Chris Lattner <sabre@nondot.org> | 2004-04-18 00:52:43 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2004-04-18 00:52:43 +0000 |
commit | 3c85eef81a13d6a2943562e5953a73a6ef6684c0 (patch) | |
tree | cd617e7fcc030453fef3be249e689b490ce07e77 /lib/Transforms/Scalar/TailDuplication.cpp | |
parent | f57a43da9c0198b8958df464755b556c83a65dd0 (diff) | |
download | external_llvm-3c85eef81a13d6a2943562e5953a73a6ef6684c0.zip external_llvm-3c85eef81a13d6a2943562e5953a73a6ef6684c0.tar.gz external_llvm-3c85eef81a13d6a2943562e5953a73a6ef6684c0.tar.bz2 |
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
Diffstat (limited to 'lib/Transforms/Scalar/TailDuplication.cpp')
-rw-r--r-- | lib/Transforms/Scalar/TailDuplication.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/TailDuplication.cpp b/lib/Transforms/Scalar/TailDuplication.cpp index 40821e4..b687084 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<unsigned> + 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<PHINode>(*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 |