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wire TargetLibraryInfo into simplify libcalls and use it in a couple of

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trivial places.  This pass needs a lot of work.

llvm-svn: 126367
This commit is contained in:
Chris Lattner 2011-02-24 07:16:14 +00:00
parent d1bb8c0277
commit e64e9c6f73
1 changed files with 17 additions and 7 deletions
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24
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@ -25,13 +25,14 @@
#include "llvm/Support/IRBuilder.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Config/config.h"
#include "llvm/Config/config.h" // FIXME: Shouldn't depend on host!
using namespace llvm;
STATISTIC(NumSimplified, "Number of library calls simplified");
@ -1369,6 +1370,8 @@ namespace {
/// This pass optimizes well known library functions from libc and libm.
///
class SimplifyLibCalls : public FunctionPass {
TargetLibraryInfo *TLI;
StringMap<LibCallOptimization*> Optimizations;
// String and Memory LibCall Optimizations
StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrRChrOpt StrRChr;
@ -1385,7 +1388,7 @@ namespace {
SPrintFOpt SPrintF; PrintFOpt PrintF;
FWriteOpt FWrite; FPutsOpt FPuts; FPrintFOpt FPrintF;
PutsOpt Puts;
bool Modified; // This is only used by doInitialization.
public:
static char ID; // Pass identification
@ -1404,13 +1407,18 @@ namespace {
void inferPrototypeAttributes(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<TargetLibraryInfo>();
}
};
char SimplifyLibCalls::ID = 0;
} // end anonymous namespace.
INITIALIZE_PASS(SimplifyLibCalls, "simplify-libcalls",
"Simplify well-known library calls", false, false)
char SimplifyLibCalls::ID = 0;
INITIALIZE_PASS_BEGIN(SimplifyLibCalls, "simplify-libcalls",
"Simplify well-known library calls", false, false)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfo)
INITIALIZE_PASS_END(SimplifyLibCalls, "simplify-libcalls",
"Simplify well-known library calls", false, false)
// Public interface to the Simplify LibCalls pass.
FunctionPass *llvm::createSimplifyLibCallsPass() {
@ -1442,9 +1450,9 @@ void SimplifyLibCalls::InitOptimizations() {
Optimizations["strcspn"] = &StrCSpn;
Optimizations["strstr"] = &StrStr;
Optimizations["memcmp"] = &MemCmp;
Optimizations["memcpy"] = &MemCpy;
if (TLI->has(LibFunc::memcpy)) Optimizations["memcpy"] = &MemCpy;
Optimizations["memmove"] = &MemMove;
Optimizations["memset"] = &MemSet;
if (TLI->has(LibFunc::memset)) Optimizations["memset"] = &MemSet;
// _chk variants of String and Memory LibCall Optimizations.
Optimizations["__strcpy_chk"] = &StrCpyChk;
@ -1507,6 +1515,8 @@ void SimplifyLibCalls::InitOptimizations() {
/// runOnFunction - Top level algorithm.
///
bool SimplifyLibCalls::runOnFunction(Function &F) {
TLI = &getAnalysis<TargetLibraryInfo>();
if (Optimizations.empty())
InitOptimizations();