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fix: format C benchmark output with comma thousands and 10-digit columns

Browse Source 
https://claude.ai/code/session_01WSNE6QKiYM2ZutQD2UihCW
This commit is contained in:
Claude
2026-04-09 23:30:35 +00:00
parent ce199f42df
commit bfe0555589
1 changed files with 22 additions and 3 deletions
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quartz/benchmarks/secp256k1_native_bench.c
+22 -3
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@@ -42,14 +42,33 @@ static uint64_t now_ns(void) {
return (uint64_t)ts.tv_sec * 1000000000ULL + ts.tv_nsec;
}
/* Format a uint64 with comma-separated thousands into a static buffer.
Uses a ring of 4 buffers so two calls can be used in one printf. */
static const char *fmt_comma(uint64_t v) {
static char bufs[4][32];
static int idx = 0;
char *buf = bufs[idx++ & 3];
char tmp[32];
int n = snprintf(tmp, sizeof(tmp), "%llu", (unsigned long long)v);
int commas = (n - 1) / 3;
int len = n + commas;
buf[len] = '\0';
int src = n - 1, dst = len - 1, grp = 0;
while (src >= 0) {
buf[dst--] = tmp[src--];
if (++grp == 3 && src >= 0) { buf[dst--] = ','; grp = 0; }
}
return buf;
}
#define BENCH(name, warmup, iters, body) do { \
for (int _w = 0; _w < (warmup); _w++) { body; } \
uint64_t _start = now_ns(); \
for (int _i = 0; _i < (iters); _i++) { body; } \
uint64_t _el = now_ns() - _start; \
printf(" %-24s %8llu ns/op %8llu ops/s\n", name, \
(unsigned long long)(_el / (iters)), \
(unsigned long long)((uint64_t)(iters) * 1000000000ULL / _el)); \
printf(" %-24s %10s ns/op %10s ops/s\n", name, \
fmt_comma(_el / (iters)), \
fmt_comma((uint64_t)(iters) * 1000000000ULL / _el)); \
} while(0)
int main(void) {