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| author | dim <dim@FreeBSD.org> | 2011-05-02 19:34:44 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2011-05-02 19:34:44 +0000 |
| commit | 2b066988909948dc3d53d01760bc2d71d32f3feb (patch) | |
| tree | fc5f365fb9035b2d0c622bbf06c9bbe8627d7279 /lib/CodeGen/PHIElimination.cpp | |
| parent | c80ac9d286b8fcc6d1ee5d76048134cf80aa9edc (diff) | |
| download | FreeBSD-src-2b066988909948dc3d53d01760bc2d71d32f3feb.zip FreeBSD-src-2b066988909948dc3d53d01760bc2d71d32f3feb.tar.gz | |
Vendor import of llvm trunk r130700:
http://llvm.org/svn/llvm-project/llvm/trunk@130700
Diffstat (limited to 'lib/CodeGen/PHIElimination.cpp')
| -rw-r--r-- | lib/CodeGen/PHIElimination.cpp | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp index 5f7cf58..af65f13 100644 --- a/lib/CodeGen/PHIElimination.cpp +++ b/lib/CodeGen/PHIElimination.cpp @@ -28,12 +28,17 @@ #include "llvm/ADT/SmallPtrSet.h" #include "llvm/ADT/STLExtras.h" #include "llvm/ADT/Statistic.h" +#include "llvm/Support/CommandLine.h" #include "llvm/Support/Compiler.h" #include "llvm/Support/Debug.h" #include <algorithm> -#include <map> using namespace llvm; +static cl::opt<bool> +DisableEdgeSplitting("disable-phi-elim-edge-splitting", cl::init(false), + cl::Hidden, cl::desc("Disable critical edge splitting " + "during PHI elimination")); + namespace { class PHIElimination : public MachineFunctionPass { MachineRegisterInfo *MRI; // Machine register information @@ -105,10 +110,12 @@ bool PHIElimination::runOnMachineFunction(MachineFunction &MF) { bool Changed = false; // Split critical edges to help the coalescer - if (LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>()) { - MachineLoopInfo *MLI = getAnalysisIfAvailable<MachineLoopInfo>(); - for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) - Changed |= SplitPHIEdges(MF, *I, *LV, MLI); + if (!DisableEdgeSplitting) { + if (LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>()) { + MachineLoopInfo *MLI = getAnalysisIfAvailable<MachineLoopInfo>(); + for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) + Changed |= SplitPHIEdges(MF, *I, *LV, MLI); + } } // Populate VRegPHIUseCount |
