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bigint.c: remove unused mpn_submul_1()

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Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-01-16 17:14:43 +09:00
parent 8089fdadf0
commit 2a415f1640
1 changed files with 0 additions and 15 deletions
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mrbgems/mruby-bigint/core/bigint.c
-15
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@@ -750,21 +750,6 @@ mpn_addmul_1(mp_limb *rp, const mp_limb *s1p, size_t n, mp_limb limb)
#endif
}
/* Multiply-and-subtract: rp[0..n-1] -= s1p[0..n-1] * limb; return borrow */
static inline mp_limb
mpn_submul_1(mp_limb *rp, const mp_limb *s1p, size_t n, mp_limb limb)
{
mp_dbl_limb borrow = 0;
for (size_t i = 0; i < n; i++) {
mp_dbl_limb prod = (mp_dbl_limb)s1p[i] * (mp_dbl_limb)limb;
mp_dbl_limb sub = (mp_dbl_limb)rp[i] - LOW(prod) - borrow;
rp[i] = LOW(sub);
/* Borrow is 1 if sub underflowed, plus HIGH(prod) */
borrow = HIGH(prod) + (sub >> (sizeof(mp_dbl_limb) * 8 - 1));
}
return (mp_limb)borrow;
}
/* Compare two same-length limb arrays: returns <0, 0, or >0 */
static inline int
mpn_cmp(const mp_limb *ap, const mp_limb *bp, size_t n)