diff options
| author | davej <davej> | 2003-03-14 18:21:12 +0000 |
|---|---|---|
| committer | davej <davej> | 2003-03-14 18:21:12 +0000 |
| commit | 7135e500e289dc526434bc0eae6e5ec0a960a702 (patch) | |
| tree | 9045250e18f4f6afe118e63e9c4e2d910962c0ca | |
| parent | 8324a62a9d22cd46cc620fa1944fb70b50b08662 (diff) | |
* bench/bench.h: improve timing routine a little. still needs work.
* bench/benchmarks.c: remove lea (eax), 1(eax) test for now.
| -rw-r--r-- | ChangeLog | 2 | ||||
| -rw-r--r-- | bench/bench.h | 16 | ||||
| -rw-r--r-- | bench/benchmarks.c | 4 |
3 files changed, 14 insertions, 8 deletions
@@ -1,6 +1,8 @@ 2003-3-14 Dave Jones <davej@codemonkey.org.uk> * identify.c: decode 0xc0000000 range cpuids if available. + * bench/bench.h: improve timing routine a little. still needs work. + * bench/benchmarks.c: remove lea (eax), 1(eax) test for now. 2003-3-13 Dave Jones <davej@codemonkey.org.uk> diff --git a/bench/bench.h b/bench/bench.h index 0d5dd09..0eb578f 100644 --- a/bench/bench.h +++ b/bench/bench.h @@ -1,15 +1,21 @@ #define rdtsc() ({ unsigned long a,d; asm volatile("rdtsc":"=a" (a), "=d" (d)); a; }) +#define NREPS 1000 + #define TIME(x,y) \ - bmin = 100000; \ - for (i = 0; i < 1000; i++) { \ - unsigned long bstart,bend; \ +{ \ + int i,j; \ + unsigned long bmin,bstart,bend; \ + for (j=0; j<100; j++) { \ + bmin = 100000; \ bstart = rdtsc(); \ - x; \ + for (i=0; i<NREPS; i++) \ + x; \ bend = rdtsc(); \ bend -= bstart; \ if (bend < bmin) \ bmin = bend; \ } \ - printf(y ": %ld cycles\n", bmin); + printf(y ": %ld cycles\n", bmin/NREPS); \ +} diff --git a/bench/benchmarks.c b/bench/benchmarks.c index 6c5d0ab..12b49a7 100644 --- a/bench/benchmarks.c +++ b/bench/benchmarks.c @@ -8,8 +8,7 @@ void show_benchmarks() { - int i, ret, tmp=0; - unsigned long bmin; + int ret, tmp=0; if (show_bench != 1) return; @@ -19,7 +18,6 @@ void show_benchmarks() TIME(asm volatile("addl $1,0(%esp)"), "addl"); TIME(asm volatile("lock ; addl $1,0(%esp)"), "locked add"); - TIME(asm volatile("lea 1(%eax),%eax"), "lea 1(%%eax),%%eax"); TIME(asm volatile("bswap %0" : "=r" (tmp) : "0" (tmp)), "bswap"); } |