Commit 739df333 authored by Richard Henderson's avatar Richard Henderson
Browse files

softfloat: Specialize udiv_qrnnd for s390x 



The ISA has a 128/64-bit division instruction.

Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
parent b299e88d

include/fpu/softfloat-macros.h

+6 −0
Original line number Diff line number Diff line
@@ -641,6 +641,12 @@ static inline uint64_t udiv_qrnnd(uint64_t *r, uint64_t n1, 
    uint64_t q;

    asm("divq %4" : "=a"(q), "=d"(*r) : "0"(n0), "1"(n1), "rm"(d));

    return q;

#elif defined(__s390x__)

    /* Need to use a TImode type to get an even register pair for DLGR.  */

    unsigned __int128 n = (unsigned __int128)n1 << 64 | n0;

    asm("dlgr %0, %1" : "+r"(n) : "r"(d));

    *r = n >> 64;

    return n;

#else

    uint64_t d0, d1, q0, q1, r1, r0, m;