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Date: Wed, 2 Apr 2025 15:42:40 +0200
From: Mateusz Guzik <mjguzik@gmail.com>
To: torvalds@linux-foundation.org, mingo@redhat.com
Cc: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH] x86: prevent gcc from emitting rep movsq/stosq for
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--uifixdeqtexi6rm7
Content-Type: text/x-csrc; charset=utf-8
Content-Disposition: attachment; filename="ccbench.c"
#include <sys/types.h>
#include <err.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define RUNCMD "gcc -c -o /tmp/out0.o /src/src0.c"
#define WARMUP 5
volatile sig_atomic_t got_alarm;
static void sigalrm_handler(int signo)
{
got_alarm = 1;
}
int main(int argc, char **argv)
{
long i;
int n;
if (argc != 2) {
errx(1, "need time limit in seconds");
}
n = atoi(argv[1]);
if (n < 1) {
errx(1, "bad arg");
}
signal(SIGALRM, sigalrm_handler);
if (!getenv("CCBENCH_SKIP_WARMUP")) {
alarm(WARMUP);
for (i = 0; !got_alarm; i++) {
system(RUNCMD);
}
printf("warmup: %ld ops (%ld ops/s)\n", i, i / WARMUP);
got_alarm = 0;
}
alarm(n);
for (i = 0; !got_alarm; i++) {
system(RUNCMD);
}
printf("bench: %ld ops (%ld ops/s)\n", i, i / n);
}
--uifixdeqtexi6rm7
Content-Type: text/x-csrc; charset=utf-8
Content-Disposition: attachment; filename="src0.c"
#include <stdio.h>
int main(void)
{
printf("Hello world!\n");
}
--uifixdeqtexi6rm7
Content-Type: text/x-csrc; charset=utf-8
Content-Disposition: attachment; filename="cc.c"
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
char *testcase_description = "compile";
void testcase(unsigned long long *iterations, unsigned long nr)
{
char cmd[1024];
sprintf(cmd, "cc -c -o /tmp/out.%ld /src/src%ld.c", nr, nr);
while (1) {
system(cmd);
(*iterations)++;
}
}
--uifixdeqtexi6rm7--