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;         \
> }
>
>
>

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