[Bug d/105413] gdc extended assembler cannot constraints r8 - r15

[ibuclaw at gdcproject dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105413

Iain Buclaw <ibuclaw at gdcproject dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Iain Buclaw <ibuclaw at gdcproject dot org> ---
@register attribute has been added, meaning that you can now have the following
as an alternative to your example.

---
import gcc.attributes : register;

@register("rax") SYSCALL rax = ident; // rax - syscall number
@register("rdi") size_t rdi = arg1;   // rdi - arg1
@register("rsi") size_t rsi = arg2;   // rsi - arg2
@register("rdx") size_t rdx = arg3;   // rdx - arg3
@register("r10") size_t r10 = arg4;   // r10 - arg4
asm @nogc nothrow {
  "syscall"
  : "=r" (rax)
  // inputs:
  : "r" (rax),
    "r" (rdi),
    "r" (rsi),
    "r" (rdx),
    "r" (r10),
    "m"( *cast(ubyte*)arg1)   // "dummy" input instead of full memory clobber
  // clobers
  : "rcx", "r11";  // Clobers rax, and rcx and r11.
}
return rax;
---

https://godbolt.org/z/PvnTsea9T