From 4a16efa3e43e35f0cc9efe3a67f620f0017c3d36 Mon Sep 17 00:00:00 2001 From: Dimitry Andric Date: Mon, 8 Apr 2013 18:41:23 +0000 Subject: Vendor import of llvm trunk r178860: http://llvm.org/svn/llvm-project/llvm/trunk@178860 --- lib/CodeGen/PeepholeOptimizer.cpp | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) (limited to 'lib/CodeGen/PeepholeOptimizer.cpp') diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp index a795ac8448f52..a7439b5129b5b 100644 --- a/lib/CodeGen/PeepholeOptimizer.cpp +++ b/lib/CodeGen/PeepholeOptimizer.cpp @@ -49,20 +49,26 @@ // v1 = bitcast v0 // = v0 // +// - Optimize Loads: +// +// Loads that can be folded into a later instruction. A load is foldable +// if it loads to virtual registers and the virtual register defined has +// a single use. //===----------------------------------------------------------------------===// #define DEBUG_TYPE "peephole-opt" #include "llvm/CodeGen/Passes.h" +#include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/SmallPtrSet.h" +#include "llvm/ADT/SmallSet.h" +#include "llvm/ADT/Statistic.h" #include "llvm/CodeGen/MachineDominators.h" #include "llvm/CodeGen/MachineInstrBuilder.h" #include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/Debug.h" #include "llvm/Target/TargetInstrInfo.h" #include "llvm/Target/TargetRegisterInfo.h" -#include "llvm/Support/CommandLine.h" -#include "llvm/ADT/DenseMap.h" -#include "llvm/ADT/SmallPtrSet.h" -#include "llvm/ADT/SmallSet.h" -#include "llvm/ADT/Statistic.h" using namespace llvm; // Optimize Extensions @@ -473,6 +479,9 @@ bool PeepholeOptimizer::foldImmediate(MachineInstr *MI, MachineBasicBlock *MBB, } bool PeepholeOptimizer::runOnMachineFunction(MachineFunction &MF) { + DEBUG(dbgs() << "********** PEEPHOLE OPTIMIZER **********\n"); + DEBUG(dbgs() << "********** Function: " << MF.getName() << '\n'); + if (DisablePeephole) return false; @@ -547,6 +556,8 @@ bool PeepholeOptimizer::runOnMachineFunction(MachineFunction &MF) { FoldAsLoadDefReg, DefMI); if (FoldMI) { // Update LocalMIs since we replaced MI with FoldMI and deleted DefMI. + DEBUG(dbgs() << "Replacing: " << *MI); + DEBUG(dbgs() << " With: " << *FoldMI); LocalMIs.erase(MI); LocalMIs.erase(DefMI); LocalMIs.insert(FoldMI); -- cgit v1.2.3