huntedbytheirsandSisyphus
370e64c3a6
smoke links crt0.o + libc.a with -nostdlib -static and proves the whole chain runs without the dynamic linker; bench_strlen and bench_syscall measure the string core and raw syscall round-trip cost via make bench. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <[email protected]>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/*
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* bench.h — tiny shared helpers for nulsl-libc benchmarks.
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*
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* Deliberately dependency-free beyond the libc itself: timing goes
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* through a raw clock_gettime syscall, and numbers are printed with
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* putchar/write because printf() is still a stub. If you write a new
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* benchmark, include this and stay this lean.
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*/
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#ifndef _NULSL_BENCH_H
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#define _NULSL_BENCH_H
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#include <sys/syscall.h>
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#include <unistd.h>
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#define BENCH_CLOCK_MONOTONIC 1
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/* Monotonic time in nanoseconds, via raw clock_gettime(2). */
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static inline long long bench_now_ns(void)
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{
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struct {
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long tv_sec;
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long tv_nsec;
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} t;
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syscall(SYS_clock_gettime, BENCH_CLOCK_MONOTONIC, &t);
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return t.tv_sec * 1000000000LL + t.tv_nsec;
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}
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/* Print an unsigned integer plus a newline, without printf(). */
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static inline void bench_print_u64(unsigned long long v)
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{
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char buf[24];
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int i = sizeof buf;
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buf[--i] = '\n';
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do {
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buf[--i] = (char)('0' + v % 10);
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v /= 10;
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} while (v);
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write(STDOUT_FILENO, buf + i, sizeof buf - i);
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}
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#endif /* _NULSL_BENCH_H */
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