6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-14 14:24:05 +00:00
Code Issues Projects Releases Wiki Activity

add "getLocation" method to AliasAnalysis for getting the source and

Browse Source 
destination location of a memcpy/memmove.  I'm not clear about whether
TBAA works on these, so I'm leaving it out for now.  Dan, please revisit
this when convenient.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-11-21 07:51:27 +00:00
parent f6f1f062cc
commit e90c5cb747
2 changed files with 26 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
lib/Analysis/AliasAnalysis.cpp
View File

@ -212,6 +212,29 @@ AliasAnalysis::Location AliasAnalysis::getLocation(const VAArgInst *VI) {
VI->getMetadata(LLVMContext::MD_tbaa));
}
AliasAnalysis::Location
AliasAnalysis::getLocationForSource(const MemTransferInst *MTI) {
uint64_t Size = UnknownSize;
if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
Size = C->getValue().getZExtValue();
// FIXME: Can memcpy/memmove have TBAA tags?
return Location(MTI->getRawSource(), Size, 0);
}
AliasAnalysis::Location
AliasAnalysis::getLocationForDest(const MemTransferInst *MTI) {
uint64_t Size = UnknownSize;
if (ConstantInt *C = dyn_cast<ConstantInt>(MTI->getLength()))
Size = C->getValue().getZExtValue();
// FIXME: Can memcpy/memmove have TBAA tags?
return Location(MTI->getRawDest(), Size, 0);
}
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(const LoadInst *L, const Location &Loc) {
// Be conservative in the face of volatile.