Displaying 3 results from an estimated 3 matches for "ddba9364".
2018 Jan 02
0
Canonical way to handle zero registers?
Hi Sean,
Just to give the GlobalISel perspective on this, GlobalISel supports the declaration of a zero register in the register class like so:
def GPR32z : RegisterOperand<GPR32> {
let GIZeroRegister = WZR;
}
With that definition, the tablegen-erated ISel code will try to replace will try to replace 'G_CONSTANT s32 0' with WZR whenever the operand is specified as GPR32z.
>
2017 Dec 22
4
Canonical way to handle zero registers?
I looked around the codebase and didn't see anything that obviously looked
like the natural place to turn constant zero immediates into zero-registers
(i.e. registers that always return zero when read). Right now we are
expanding them in ISelLowering::LowerOperation but that seems too early.
The specific issue I'm hitting is that we have a register that reads as -1
and so when we replace
2018 Jan 04
2
Canonical way to handle zero registers?
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