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* Add support for the -stats command line option to report how much is changed

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* Make cast-of-self-ty DCE the dead cast instruction immediately instead of
  waiting for it to be DCE'd by another sweep over the function.  This speeds
  this up noticably.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2597 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-05-10 15:29:25 +00:00
parent c79260af6e
commit 3c0193742a
1 changed files with 24 additions and 2 deletions
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26
lib/Transforms/LevelRaise.cpp
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@ -16,8 +16,16 @@
#include "llvm/Analysis/Expressions.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "Support/STLExtras.h"
#include "Support/StatisticReporter.h"
#include <algorithm>
static Statistic<> NumLoadStorePeepholes("raise\t\t- Number of load/store peepholes");
static Statistic<> NumGEPInstFormed("raise\t\t- Number of other getelementptr's formed");
static Statistic<> NumExprTreesConv("raise\t\t- Number of expression trees converted");
static Statistic<> NumCastOfCast("raise\t\t- Number of cast-of-self removed");
static Statistic<> NumDCEorCP("raise\t\t- Number of insts DCE'd or constprop'd");
//#define DEBUG_PEEPHOLE_INSTS 1
#ifdef DEBUG_PEEPHOLE_INSTS
@ -187,6 +195,13 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
CI->setName("");
Src->setName(Name, BB->getParent()->getSymbolTable());
}
// DCE the instruction now, to avoid having the iterative version of DCE
// have to worry about it.
//
delete BB->getInstList().remove(BI);
++NumCastOfCast;
return true;
}
@ -215,6 +230,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
#ifdef DEBUG_PEEPHOLE_INSTS
cerr << "DONE CONVERTING SRC EXPR TYPE: \n" << BB->getParent();
#endif
++NumExprTreesConv;
return true;
}
@ -236,6 +252,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
#ifdef DEBUG_PEEPHOLE_INSTS
cerr << "DONE CONVERTING EXPR TYPE: \n\n" << BB->getParent();
#endif
++NumExprTreesConv;
return true;
}
}
@ -247,6 +264,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
if (HandleCastToPointer(BI, DestPTy)) {
BI = BB->begin(); // Rescan basic block. BI might be invalidated.
++NumGEPInstFormed;
return true;
}
}
@ -331,6 +349,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
CI->setOperand(0, GEP);
PRINT_PEEPHOLE2("cast-for-first:out", GEP, CI);
++NumGEPInstFormed;
return true;
}
}
@ -373,6 +392,7 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
ReplaceInstWithInst(BB->getInstList(), BI,
SI = new StoreInst(NCI, CastSrc));
PRINT_PEEPHOLE3("st-src-cast:out", NCI, CastSrc, SI);
++NumLoadStorePeepholes;
return true;
}
@ -380,9 +400,10 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
isa<CastInst>(I->getOperand(1))) {
if (PeepholeOptimizeAddCast(BB, BI, I->getOperand(0),
cast<CastInst>(I->getOperand(1))))
cast<CastInst>(I->getOperand(1)))) {
++NumGEPInstFormed;
return true;
}
#endif
}
@ -404,6 +425,7 @@ static bool DoRaisePass(Function *F) {
#endif
if (dceInstruction(BIL, BI) || doConstantPropogation(BB, BI)) {
Changed = true;
++NumDCEorCP;
#ifdef DEBUG_PEEPHOLE_INSTS
cerr << "***\t\t^^-- DeadCode Elinated!\n";
#endif