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divmoddi4: Handle negative remainders.

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The sign of the remainder matches the sign of the numerator in C.

Reported by:	jrtc27
Reviewed by:	jrtc27
Differential Revision:	https://reviews.freebsd.org/D40832
This commit is contained in:
John Baldwin 2023-07-01 14:43:41 -07:00
parent 5de9420ad5
commit df11fb9bf0
1 changed files with 6 additions and 6 deletions
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12
sys/libkern/divmoddi4.c
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@ -43,18 +43,18 @@ quad_t
__divmoddi4(quad_t a, quad_t b, quad_t *rem)
{
u_quad_t ua, ub, uq, urem;
int neg;
int negq, negr;
if (a < 0)
ua = -(u_quad_t)a, neg = 1;
ua = -(u_quad_t)a, negq = 1, negr = 1;
else
ua = a, neg = 0;
ua = a, negq = 0, negr = 0;
if (b < 0)
ub = -(u_quad_t)b, neg ^= 1;
ub = -(u_quad_t)b, negq ^= 1;
else
ub = b;
uq = __qdivrem(ua, ub, &urem);
if (rem != 0)
*rem = urem;
return (neg ? -uq : uq);
*rem = negr ? -urem : urem;
return (negq ? -uq : uq);
}