Re: [Qemu-devel] [PATCH 5/9] coroutine: add host specific coroutine backend for 64-bit s390

[Richard Henderson]

On 5/4/19 5:05 AM, Paolo Bonzini wrote:
> +  "bras %%r3, 1f\n"                /* source PC will be after the BR */ \
> +  "1: aghi %%r3, 12\n"             /* 4 */                              \
> +  "stg %%r3, %[SCRATCH](%%r1)\n"   /* 6 save switch-back PC */          \
> +  "br %%r4\n"                      /* 2 jump to destination PC */       \

Better as

        larl    %r3, 2f
        stg     %r3, SCRATCH(%r1)
        br      %r4
2:


r~