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enhance memcpyopt to obey -fno-builtin and friends. This addresses a

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problem reported on cfe-dev.

llvm-svn: 130661
This commit is contained in:
Chris Lattner 2011-05-01 18:27:11 +00:00
parent d49e7769a7
commit c04013dd48
2 changed files with 20 additions and 0 deletions
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3
include/llvm/Target/TargetLibraryInfo.h
View File

@ -23,6 +23,9 @@ namespace llvm {
// void *memcpy(void *s1, const void *s2, size_t n);
memcpy,
// void *memmove(void *s1, const void *s2, size_t n);
memmove,
/// void memset_pattern16(void *b, const void *pattern16, size_t len);
memset_pattern16,

17
lib/Transforms/Scalar/MemCpyOptimizer.cpp
View File

@ -28,6 +28,7 @@
#include "llvm/Support/IRBuilder.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include <list>
using namespace llvm;
@ -299,12 +300,15 @@ void MemsetRanges::addRange(int64_t Start, int64_t Size, Value *Ptr,
namespace {
class MemCpyOpt : public FunctionPass {
MemoryDependenceAnalysis *MD;
TargetLibraryInfo *TLI;
const TargetData *TD;
public:
static char ID; // Pass identification, replacement for typeid
MemCpyOpt() : FunctionPass(ID) {
initializeMemCpyOptPass(*PassRegistry::getPassRegistry());
MD = 0;
TLI = 0;
TD = 0;
}
bool runOnFunction(Function &F);
@ -316,6 +320,7 @@ namespace {
AU.addRequired<DominatorTree>();
AU.addRequired<MemoryDependenceAnalysis>();
AU.addRequired<AliasAnalysis>();
AU.addRequired<TargetLibraryInfo>();
AU.addPreserved<AliasAnalysis>();
AU.addPreserved<MemoryDependenceAnalysis>();
}
@ -346,6 +351,7 @@ INITIALIZE_PASS_BEGIN(MemCpyOpt, "memcpyopt", "MemCpy Optimization",
false, false)
INITIALIZE_PASS_DEPENDENCY(DominatorTree)
INITIALIZE_PASS_DEPENDENCY(MemoryDependenceAnalysis)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfo)
INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
INITIALIZE_PASS_END(MemCpyOpt, "memcpyopt", "MemCpy Optimization",
false, false)
@ -804,6 +810,9 @@ bool MemCpyOpt::processMemCpy(MemCpyInst *M) {
bool MemCpyOpt::processMemMove(MemMoveInst *M) {
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
if (!TLI->has(LibFunc::memmove))
return false;
// See if the pointers alias.
if (!AA.isNoAlias(AA.getLocationForDest(M), AA.getLocationForSource(M)))
return false;
@ -935,6 +944,14 @@ bool MemCpyOpt::runOnFunction(Function &F) {
bool MadeChange = false;
MD = &getAnalysis<MemoryDependenceAnalysis>();
TD = getAnalysisIfAvailable<TargetData>();
TLI = &getAnalysis<TargetLibraryInfo>();
// If we don't have at least memset and memcpy, there is little point of doing
// anything here. These are required by a freestanding implementation, so if
// even they are disabled, there is no point in trying hard.
if (!TLI->has(LibFunc::memset) || !TLI->has(LibFunc::memcpy))
return false;
while (1) {
if (!iterateOnFunction(F))
break;