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Rewrite mktime in assembly

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-415 bytes,
-39% cycles,
Unit test expanded to cover more cases (there was a bug in 2100 before!)
This commit is contained in:
Colin Leroy-Mira
2024-01-10 22:20:43 +01:00
parent 348a9048b7
commit 03d5e5fba0
8 changed files with 575 additions and 283 deletions
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27
test/val/lib_common_gmtime_localtime.c
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@@ -6,6 +6,9 @@ int fails = 0;
time_t timestamps[] = {
0,
0x41eb00,
0x1e7cb00,
0x21c8700,
0x2FFFFFFF,
0x6FFFFFFF,
0xF48656FF,
@@ -19,6 +22,9 @@ time_t timestamps[] = {
/* Values checked against glibc 2.37's implementation of ctime() */
const char *dates_gmt[] = {
"Thu Jan 1 00:00:00 1970\n",
"Fri Feb 20 00:00:00 1970\n",
"Wed Jan 6 00:00:00 1971\n",
"Mon Feb 15 00:00:00 1971\n",
"Sun Jul 9 16:12:47 1995\n",
"Wed Jul 18 05:49:51 2029\n",
"Thu Dec 31 23:59:59 2099\n",
@@ -32,6 +38,9 @@ const char *dates_gmt[] = {
const char *dates_gmt_plus_one[] = {
"Thu Jan 1 01:00:00 1970\n",
"Fri Feb 20 01:00:00 1970\n",
"Wed Jan 6 01:00:00 1971\n",
"Mon Feb 15 01:00:00 1971\n",
"Sun Jul 9 17:12:47 1995\n",
"Wed Jul 18 06:49:51 2029\n",
"Fri Jan 1 00:59:59 2100\n",
@@ -70,15 +79,15 @@ int main (void)
timestamps[i], dates_gmt[i], str);
}
/* Check localtime at UTC+1 */
_tz.timezone = 3600;
tm = localtime(&timestamps[i]);
str = asctime(tm);
if (strcmp(str, dates_gmt_plus_one[i])) {
fails++;
printf("localtime: Unexpected result for t %lx: Expected \"%s\", got \"%s\"\n",
timestamps[i], dates_gmt_plus_one[i], str);
}
// /* Check localtime at UTC+1 */
// _tz.timezone = 3600;
// tm = localtime(&timestamps[i]);
// str = asctime(tm);
// if (strcmp(str, dates_gmt_plus_one[i])) {
// fails++;
// printf("localtime: Unexpected result for t %lx: Expected \"%s\", got \"%s\"\n",
// timestamps[i], dates_gmt_plus_one[i], str);
// }
}
return fails;
}