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| author | Paul Eggert <eggert@cs.ucla.edu> | 2020-08-04 23:15:31 -0700 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2020-08-04 23:15:31 -0700 |
| commit | db10cd9e62a29d6dccf55bbce367dab5a72220bb (patch) | |
| tree | e8a0a591e2c85c3a0bd9f2f3558fc056319eacd3 /time/mktime.c | |
| parent | 7279f0a282283db04352e247c3bdb39ee03d10f6 (diff) | |
| download | glibc-db10cd9e62a29d6dccf55bbce367dab5a72220bb.tar.gz glibc-db10cd9e62a29d6dccf55bbce367dab5a72220bb.tar.xz glibc-db10cd9e62a29d6dccf55bbce367dab5a72220bb.zip | |
Sync mktime.c from Gnulib
* time/mktime.c: Sync from Gnulib. This micro-optimizes three division-related computations.
Diffstat (limited to 'time/mktime.c')
| -rw-r--r-- | time/mktime.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/time/mktime.c b/time/mktime.c index 63c82fc6a9..c8735164f6 100644 --- a/time/mktime.c +++ b/time/mktime.c @@ -141,7 +141,7 @@ shr (long_int a, int b) long_int one = 1; return (-one >> 1 == -1 ? a >> b - : a / (one << b) - (a % (one << b) < 0)); + : (a + (a < 0)) / (one << b) - (a < 0)); } /* Bounds for the intersection of __time64_t and long_int. */ @@ -211,8 +211,8 @@ ydhms_diff (long_int year1, long_int yday1, int hour1, int min1, int sec1, Take care to avoid integer overflow here. */ int a4 = shr (year1, 2) + shr (TM_YEAR_BASE, 2) - ! (year1 & 3); int b4 = shr (year0, 2) + shr (TM_YEAR_BASE, 2) - ! (year0 & 3); - int a100 = a4 / 25 - (a4 % 25 < 0); - int b100 = b4 / 25 - (b4 % 25 < 0); + int a100 = (a4 + (a4 < 0)) / 25 - (a4 < 0); + int b100 = (b4 + (b4 < 0)) / 25 - (b4 < 0); int a400 = shr (a100, 2); int b400 = shr (b100, 2); int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400); |