softfloat: Specialize udiv_qrnnd for s390x
The ISA has a 128/64-bit division instruction. Reviewed-by: David Hildenbrand <david@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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@ -641,6 +641,12 @@ static inline uint64_t udiv_qrnnd(uint64_t *r, uint64_t n1,
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uint64_t q;
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asm("divq %4" : "=a"(q), "=d"(*r) : "0"(n0), "1"(n1), "rm"(d));
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return q;
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#elif defined(__s390x__)
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/* Need to use a TImode type to get an even register pair for DLGR. */
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unsigned __int128 n = (unsigned __int128)n1 << 64 | n0;
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asm("dlgr %0, %1" : "+r"(n) : "r"(d));
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*r = n >> 64;
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return n;
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#else
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uint64_t d0, d1, q0, q1, r1, r0, m;
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