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Add some alignment info where LLVM might otherwise be more pessimistic.

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In particular, %.nest_arg is always aligned even though it's bitcast from i8*.

Pointers in vtables are also guaranteed to be stored at aligned addresses.
This commit is contained in:
Frits van Bommel
2009-04-12 21:56:43 +02:00
parent 751f528969
commit 071bad95dc
4 changed files with 37 additions and 16 deletions
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gen/tollvm.cpp
+19 -3
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@@ -426,7 +426,7 @@ void DtoMemSetZero(LLValue* dst, LLValue* nbytes)
//////////////////////////////////////////////////////////////////////////////////////////
void DtoMemCpy(LLValue* dst, LLValue* src, LLValue* nbytes)
void DtoMemCpy(LLValue* dst, LLValue* src, LLValue* nbytes, unsigned align)
{
dst = DtoBitCast(dst,getVoidPtrType());
src = DtoBitCast(src,getVoidPtrType());
@@ -435,7 +435,7 @@ void DtoMemCpy(LLValue* dst, LLValue* src, LLValue* nbytes)
llvm::Function* fn = llvm::Intrinsic::getDeclaration(gIR->module,
llvm::Intrinsic::memcpy, &intTy, 1);
gIR->ir->CreateCall4(fn, dst, src, nbytes, DtoConstUint(0), "");
gIR->ir->CreateCall4(fn, dst, src, nbytes, DtoConstUint(align), "");
}
//////////////////////////////////////////////////////////////////////////////////////////
@@ -573,11 +573,20 @@ LLValue* DtoLoad(LLValue* src, const char* name)
{
// if (Logger::enabled())
// Logger::cout() << "loading " << *src << '\n';
LLValue* ld = gIR->ir->CreateLoad(src, name ? name : "tmp");
llvm::LoadInst* ld = gIR->ir->CreateLoad(src, name ? name : "tmp");
//ld->setVolatile(gIR->func()->inVolatile);
return ld;
}
// Like DtoLoad, but the pointer is guaranteed to be aligned appropriately for the type.
LLValue* DtoAlignedLoad(LLValue* src, const char* name)
{
llvm::LoadInst* ld = gIR->ir->CreateLoad(src, name ? name : "tmp");
ld->setAlignment(getABITypeAlign(ld->getType()));
return ld;
}
void DtoStore(LLValue* src, LLValue* dst)
{
// if (Logger::enabled())
@@ -586,6 +595,13 @@ void DtoStore(LLValue* src, LLValue* dst)
//st->setVolatile(gIR->func()->inVolatile);
}
// Like DtoStore, but the pointer is guaranteed to be aligned appropriately for the type.
void DtoAlignedStore(LLValue* src, LLValue* dst)
{
llvm::StoreInst* st = gIR->ir->CreateStore(src,dst);
st->setAlignment(getABITypeAlign(src->getType()));
}
//////////////////////////////////////////////////////////////////////////////////////////
LLValue* DtoBitCast(LLValue* v, const LLType* t, const char* name)