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Reduce GNU Make latency 17% for cosmo

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fgets() is now 4x faster which makes Make 2% faster. Landlock Make now
has a builtin $(uniq ...) function that uses critbit trees rather than
functional programming. Since uniq is the most important function this
optimization makes our cold start latency 15% faster.
This commit is contained in:
Justine Tunney 2022-08-19 15:29:24 -07:00
parent 8835b82a7c
commit d76dfadc7a
7 changed files with 96 additions and 11 deletions
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35
libc/stdio/fgets_unlocked.c
View file

@ -16,8 +16,12 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/kprintf.h"
#include "libc/macros.internal.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
/**
* Reads line from stream.
@ -33,20 +37,33 @@
* zero characters have been read
*/
char *fgets_unlocked(char *s, int size, FILE *f) {
int c;
char *p;
int c, n;
char *p, *b, *t;
p = s;
if (size > 0) {
while (--size > 0) {
if ((c = fgetc_unlocked(f)) == -1) {
if (ferror_unlocked(f) == EINTR) {
continue;
} else {
break;
if (!IsTiny() && f->beg < f->end) {
b = f->buf + f->beg;
n = MIN(f->end - f->beg, size);
if ((t = memchr(b, '\n', n))) {
n = t + 1 - b;
}
memcpy(p, b, n);
f->beg += n;
size -= n - 1;
p += n;
if (t) break;
} else {
if ((c = fgetc_unlocked(f)) == -1) {
if (ferror_unlocked(f) == EINTR) {
continue;
} else {
break;
}
}
*p++ = c & 255;
if (c == '\n') break;
}
*p++ = c & 255;
if (c == '\n') break;
}
*p = '\0';
}