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Add chibicc

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This program popped up on Hacker News recently. It's the only modern
compiler I've ever seen that doesn't have dependencies and is easily
modified. So I added all of the missing GNU extensions I like to use
which means it might be possible soon to build on non-Linux and have
third party not vendor gcc binaries.
This commit is contained in:
Justine Tunney 2020-12-05 12:20:41 -08:00
parent e44a0cf6f8
commit 8da931a7f6
298 changed files with 19493 additions and 11950 deletions
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13
examples/invtsc.c
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@ -18,7 +18,7 @@
#include "libc/sysv/consts/sig.h"
#include "libc/time/time.h"
#include "libc/x/x.h"
#include "third_party/dtoa/dtoa.h"
#include "third_party/gdtoa/gdtoa.h"
/**
* @fileoverview Measure CPU clock mystery constants.
@ -52,15 +52,18 @@ long double GetSample(void) {
void MeasureNanosecondsPerAlwaysRunningTimerCycle(void) {
int i;
long double avg, samp;
long double avg, samp, elapsed;
start_ = now();
for (i = 1, avg = 1.0L; !isdone_; ++i) {
samp = GetSample();
avg += (samp - avg) / i;
dsleep(kInterval);
printf("1c = %sns (last=%sns spent=%ss)\n", g_fmt(dtoabuf_[0], (double)avg),
g_fmt(dtoabuf_[1], (double)samp),
g_fmt(dtoabuf_[2], (double)(now() - start_)));
elapsed = now() - start_;
g_xfmt_p(dtoabuf_[0], &avg, 15, 32, 0);
g_xfmt_p(dtoabuf_[1], &samp, 15, 32, 0);
g_xfmt_p(dtoabuf_[2], &elapsed, 15, 32, 0);
printf("1c = %sns (last=%sns spent=%ss)\n", dtoabuf_[0], dtoabuf_[1],
dtoabuf_[2]);
}
}