From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: Re: [musl] Q: dealing with missing removal of excess precision
Date: Thu, 6 Feb 2020 23:08:34 +0100 [thread overview]
Message-ID: <20200206220834.GD23985@port70.net> (raw)
In-Reply-To: <20200206200258.GI1663@brightrain.aerifal.cx>
* Rich Felker <dalias@libc.org> [2020-02-06 15:02:58 -0500]:
> #include <math.h>
>
> int main()
> {
> double x, a=0;
> for (x=-2; x<2; x+=0x1p-24)
> a += exp(x);
> return (long long)a;
> }
same here on my old core i5 x86_64 laptop
asm: 3.13s
c : 2.67s
optimized-routines benchmark is
asm:
exp rthruput: 44.18 ns/elem 44176510 ns in [-9.9 9.9]
exp latency: 48.32 ns/call 48317455 ns in [-9.9 9.9]
expf rthruput: 28.59 ns/elem 28586714 ns in [-9.9 9.9]
expf latency: 44.54 ns/call 44536368 ns in [-9.9 9.9]
exp2 rthruput: 42.63 ns/elem 42634692 ns in [-9.9 9.9]
exp2 latency: 46.54 ns/call 46543915 ns in [-9.9 9.9]
exp2f rthruput: 27.75 ns/elem 27751888 ns in [-9.9 9.9]
exp2f latency: 42.91 ns/call 42908855 ns in [-9.9 9.9]
c:
exp rthruput: 34.74 ns/elem 34735750 ns in [-9.9 9.9]
exp latency: 38.88 ns/call 38879834 ns in [-9.9 9.9]
expf rthruput: 14.88 ns/elem 14878824 ns in [-9.9 9.9]
expf latency: 26.74 ns/call 26740464 ns in [-9.9 9.9]
exp2 rthruput: 31.62 ns/elem 31622777 ns in [-9.9 9.9]
exp2 latency: 35.76 ns/call 35760590 ns in [-9.9 9.9]
exp2f rthruput: 14.87 ns/elem 14869128 ns in [-9.9 9.9]
exp2f latency: 24.80 ns/call 24795727 ns in [-9.9 9.9]
next prev parent reply other threads:[~2020-02-06 22:08 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-05 16:35 math patches for moving bare asm to C inline asm Alexander Monakov
2020-01-05 16:36 ` [PATCH] math: move x86_64 fabs, fabsf to C with " Alexander Monakov
2020-01-05 20:05 ` Rich Felker
2020-01-05 21:32 ` Alexander Monakov
2020-01-05 22:43 ` Rich Felker
2020-01-06 8:17 ` Alexander Monakov
2020-01-06 8:40 ` [PATCH] math: move more x86-family fabs functions to C Alexander Monakov
2020-03-21 17:06 ` [musl] " Rich Felker
2020-01-06 16:50 ` [PATCH] math: move trivial x86-family sqrt " Alexander Monakov
2020-01-06 17:43 ` [PATCH] math: move i386 sqrtf " Alexander Monakov
2020-01-06 18:32 ` Pascal Cuoq
2020-01-09 15:55 ` Alexander Monakov
2020-01-09 17:00 ` Rich Felker
2020-01-09 21:00 ` Szabolcs Nagy
2020-01-09 22:00 ` Rich Felker
2020-01-09 23:18 ` Szabolcs Nagy
2020-01-10 2:07 ` Rich Felker
2020-01-10 9:17 ` Szabolcs Nagy
2020-01-14 17:59 ` [musl] " Alexander Monakov
2020-01-14 18:47 ` Szabolcs Nagy
2020-01-07 13:06 ` [PATCH] math: move i386 sqrt " Alexander Monakov
2020-01-08 7:26 ` Rich Felker
2020-03-21 17:53 ` [musl] " Rich Felker
2020-03-21 17:57 ` Rich Felker
2020-03-21 20:30 ` Alexander Monakov
2020-01-11 15:06 ` [PATCH] math: move x86_64 (l)lrint(f) functions " Alexander Monakov
2020-01-11 15:23 ` [PATCH] math: move more x86-family lrint " Alexander Monakov
2020-01-11 16:07 ` Rich Felker
2020-01-11 16:22 ` Rich Felker
2020-01-14 11:54 ` [musl] [PATCH] math: move x86-family rint " Alexander Monakov
2020-01-14 18:17 ` [musl] Q: dealing with missing removal of excess precision Alexander Monakov
2020-01-14 18:50 ` Szabolcs Nagy
2020-01-14 18:58 ` Rich Felker
2020-01-14 19:53 ` Alexander Monakov
2020-02-06 14:51 ` Rich Felker
2020-02-06 17:15 ` Alexander Monakov
2020-02-06 17:46 ` Rich Felker
2020-02-06 19:03 ` Rich Felker
2020-02-06 20:02 ` Rich Felker
2020-02-06 22:08 ` Szabolcs Nagy [this message]
2020-02-22 19:59 ` Rich Felker
2020-02-22 20:21 ` Alexander Monakov
2020-02-23 0:19 ` Rich Felker
2020-02-23 16:14 ` Alexander Monakov
2020-03-20 18:12 ` Rich Felker
2020-03-22 1:19 ` Rich Felker
2020-03-22 17:40 ` Alexander Monakov
2020-03-22 17:53 ` Rich Felker
2020-03-22 18:51 ` Alexander Monakov
2020-03-22 19:10 ` Rich Felker
2020-03-22 19:46 ` Alexander Monakov
2020-01-14 20:41 ` [musl] [PATCH] math: move x86-family remainder functions to C Alexander Monakov
2020-01-15 6:54 ` Szabolcs Nagy
2020-01-15 15:44 ` [musl] [PATCH] math: move x86-family fmod " Alexander Monakov
2020-01-16 21:00 ` [musl] [PATCH] math: add x86_64 remquol Alexander Monakov
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