However the constraint must be wrong there. Sorry about split message. On Tue, Mar 1, 2022 at 3:21 PM David Miller <dmiller...@gmail.com> wrote:
> I used
>
>
> #define Fi3(S, ASM) uint64_t S(uint64_t a, uint64_t b, uint64_t c) \
> { \
> uint64_t res = 0; \
> asm volatile ( \
> "ltgr %[c], %[c]\n" \
> ASM \
> "stg %[c], %[res] " \
> : [res] "=&r" (res) \
> : [a] "r" (a), \
> [b] "r" (b), \
> [c] "r" (c) \
> ); \
> return res; \
> }
>
>
>
