Displaying 4 results from an estimated 4 matches for "gepi0".
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2008 Apr 04
2
[LLVMdev] InstCombine Question
I am confused by this bit of code in instcombine:
09789 if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(Op)) {
09790 const Value *GEPI0 = GEPI->getOperand(0);
09791 // TODO: Consider a target hook for valid address spaces for this
xform.
09792 if (isa<ConstantPointerNull>(GEPI0) &&
09793 cast<PointerType>(GEPI0->getType())->getAddressSpace() == 0) {
09794 // Insert a new store to...
2008 Apr 04
0
[LLVMdev] InstCombine Question
On Fri, 4 Apr 2008, David Greene wrote:
> I am confused by this bit of code in instcombine:
>
> 09789 if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(Op)) {
> 09790 const Value *GEPI0 = GEPI->getOperand(0);
> 09791 // TODO: Consider a target hook for valid address spaces for this
> xform.
> 09792 if (isa<ConstantPointerNull>(GEPI0) &&
> 09793 cast<PointerType>(GEPI0->getType())->getAddressSpace() == 0) {
> 09794 /...
2014 Dec 09
2
[LLVMdev] Question on equivalence of pointer types
...loading null is undefined, but only for addrspace(0). Whether other address spaces trap or give undefined behaviour on loading null is target dependent.
Thanks,
Pete
// load(gep null, ...) -> unreachable
if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(Op)) {
const Value *GEPI0 = GEPI->getOperand(0);
// TODO: Consider a target hook for valid address spaces for this xform.
if (isa<ConstantPointerNull>(GEPI0) && GEPI->getPointerAddressSpace() == 0){
// Insert a new store to null instruction before the load to indicate
// that this cod...
2014 Dec 05
3
[LLVMdev] Question on equivalence of pointer types
Is copy.0 semantically equivalent to copy.1 in the following example?
define void @copy.0(i8 addrspace(1)* addrspace(1)* %src, i8
addrspace(1)* addrspace(1)* %dst) {
entry:
%val = load i8 addrspace(1)* addrspace(1)* %src
store i8 addrspace(1)* %val, i8 addrspace(1)* addrspace(1)* %dst
ret void
}
define void @copy.1(i8 addrspace(1)* addrspace(1)* %src, i8
addrspace(1)* addrspace(1)* %dst)