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42 lines
787 B
42 lines
787 B
5 years ago
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define CPU_CYCS 2100
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#define MAX_BUF (1024*1024) //1m
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#define ITERS_15US 125500
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#define MULTIPLE 5
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#define SPIN_ITERS (ITERS_15US*MULTIPLE)
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__attribute__((optnone)) static void
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wrk(void)
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{
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unsigned int spin = 0;
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while (spin < SPIN_ITERS) {
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//__asm__ __volatile__("nop": : :"memory");
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spin++;
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}
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}
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//__attribute__((optnone)) int
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int
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main(void)
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{
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char *d = malloc(MAX_BUF + 1);
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int r = read(0, d, MAX_BUF);
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// unsigned long long st = rdtsc(), en = 0;
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// wrk();
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// en = rdtsc();
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// if (r <= 0) printf("%llu\n", en > st ? (en - st)/CPU_CYCS : -1);
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if (r < 0) printf("E\n");
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else if (r == 0) printf("hello\n");
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else write(1, d, r);
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return 0;
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}
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