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Generalize FunctionEmitContext::PtrToIntInst and IntToPtrInst to

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do the right thing if given a varying lvalue (i.e. an array of
pointers).  Fixes issue #34.
This commit is contained in:
Matt Pharr
2011-06-29 12:37:34 +01:00
parent 5f7e61f9b5
commit eb22fa6173
2 changed files with 48 additions and 18 deletions
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58
ctx.cpp
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@@ -1109,7 +1109,7 @@ FunctionEmitContext::BitCastInst(llvm::Value *value, const llvm::Type *type,
}
llvm::Instruction *
llvm::Value *
FunctionEmitContext::PtrToIntInst(llvm::Value *value, const llvm::Type *type,
const char *name) {
if (value == NULL) {
@@ -1117,16 +1117,31 @@ FunctionEmitContext::PtrToIntInst(llvm::Value *value, const llvm::Type *type,
return NULL;
}
// TODO: we should probably handle the array case as in
// e.g. BitCastInst(), but we don't currently need that functionality
llvm::Instruction *inst =
new llvm::PtrToIntInst(value, type, name ? name : "ptr2int", bblock);
AddDebugPos(inst);
return inst;
const llvm::Type *valType = value->getType();
const llvm::ArrayType *at = llvm::dyn_cast<const llvm::ArrayType>(valType);
if (at && llvm::isa<const llvm::PointerType>(at->getElementType())) {
// varying lvalue -> apply ptr to int to the individual pointers
assert((int)at->getNumElements() == g->target.vectorWidth);
llvm::Value *ret =
llvm::UndefValue::get(llvm::ArrayType::get(type, g->target.vectorWidth));
for (int i = 0; i < g->target.vectorWidth; ++i) {
llvm::Value *elt = ExtractInst(value, i);
llvm::Value *p2i = PtrToIntInst(elt, type, name);
ret = InsertInst(ret, p2i, i);
}
return ret;
}
else {
llvm::Instruction *inst =
new llvm::PtrToIntInst(value, type, name ? name : "ptr2int", bblock);
AddDebugPos(inst);
return inst;
}
}
llvm::Instruction *
llvm::Value *
FunctionEmitContext::IntToPtrInst(llvm::Value *value, const llvm::Type *type,
const char *name) {
if (value == NULL) {
@@ -1134,12 +1149,27 @@ FunctionEmitContext::IntToPtrInst(llvm::Value *value, const llvm::Type *type,
return NULL;
}
// TODO: we should probably handle the array case as in
// e.g. BitCastInst(), but we don't currently need that functionality
llvm::Instruction *inst =
new llvm::IntToPtrInst(value, type, name ? name : "int2ptr", bblock);
AddDebugPos(inst);
return inst;
const llvm::Type *valType = value->getType();
const llvm::ArrayType *at = llvm::dyn_cast<const llvm::ArrayType>(valType);
if (at && llvm::isa<const llvm::PointerType>(at->getElementType())) {
// varying lvalue -> apply int to ptr to the individual pointers
assert((int)at->getNumElements() == g->target.vectorWidth);
llvm::Value *ret =
llvm::UndefValue::get(llvm::ArrayType::get(type, g->target.vectorWidth));
for (int i = 0; i < g->target.vectorWidth; ++i) {
llvm::Value *elt = ExtractInst(value, i);
llvm::Value *i2p = IntToPtrInst(elt, type, name);
ret = InsertInst(ret, i2p, i);
}
return ret;
}
else {
llvm::Instruction *inst =
new llvm::IntToPtrInst(value, type, name ? name : "int2ptr", bblock);
AddDebugPos(inst);
return inst;
}
}