Re: [RFC] Linux system call builtins

[Paul Koning via Gcc]

> On Apr 8, 2024, at 4:01 PM, Paul Iannetta via Gcc <gcc@gcc.gnu.org> wrote:
> 
> On Mon, Apr 08, 2024 at 11:26:40AM -0700, Andrew Pinski wrote:
>> On Mon, Apr 8, 2024 at 11:20 AM Paul Iannetta via Gcc <gcc@gcc.gnu.org> 
>> wrote:
>>> ...
>> Also do you sign or zero extend a 32bit argument for LP64 targets?
>> Right now it is not obvious nor documented in your examples.
>> 
> 
> Another case would be targets allowing an immediate argument for their
> syscall instruction.  Sign extend is probably always an error, zero
> extend may give the expected results. 

It depends on the ABI.  For example, on MIPS, pointers are treated as signed 
when extending from 32 to 64 bits.

        paul