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Eggert tuneups

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SCCS-file: difftime.c
SCCS-SID: 7.6
This commit is contained in:
Arthur David Olson
1996-01-16 12:04:08 -05:00
committed by Paul Eggert
parent 2143f48eda
commit 7ffbb96c5e
1 changed files with 3 additions and 5 deletions
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8
difftime.c
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@ -43,9 +43,7 @@ const time_t time0;
/*
** Repair delta overflow.
*/
hibit = 1;
while ((hibit <<= 1) > 0)
continue;
hibit = (~ (time_t) 0) << (TYPE_BIT(time_t) - 1);
/*
** The following expression rounds twice, which means
** the result may not be the closest to the true answer.
@ -65,10 +63,10 @@ const time_t time0;
** This problem occurs only with very large differences.
** It's too painful to fix this portably.
** We are not alone in this problem;
** many C compilers round twice when converting
** some C compilers round twice when converting
** large unsigned types to small floating types,
** so if time_t is unsigned the "return delta" above
** has the same double-rounding problem.
** has the same double-rounding problem with those compilers.
*/
return delta - 2 * (long_double) hibit;
}