From: Alexander Monakov <amonakov@ispras.ru>
To: musl@lists.openwall.com
Subject: [PATCH] math: move i386 sqrtf to C
Date: Mon, 6 Jan 2020 20:43:46 +0300 [thread overview]
Message-ID: <20200106174346.6489-1-amonakov@ispras.ru> (raw)
In-Reply-To: <alpine.LNX.2.20.13.2001051915090.31907@monopod.intra.ispras.ru>
[-- Attachment #1: Type: text/plain, Size: 460 bytes --]
---
Yay, first not entirely trivial function.
Apparently that double rounding yields the correct result here was
suggested by Stephen Canon in https://stackoverflow.com/a/9689746/4755075
Should his contribution be mentioned somehow in the source code?
src/math/i386/sqrtf.c | 8 ++++++++
src/math/i386/sqrtf.s | 7 -------
2 files changed, 8 insertions(+), 7 deletions(-)
create mode 100644 src/math/i386/sqrtf.c
delete mode 100644 src/math/i386/sqrtf.s
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[-- Attachment #2: 0004-math-move-i386-sqrtf-to-C.patch --]
[-- Type: text/x-patch; name="0004-math-move-i386-sqrtf-to-C.patch", Size: 559 bytes --]
diff --git a/src/math/i386/sqrtf.c b/src/math/i386/sqrtf.c
new file mode 100644
index 00000000..2bcc7754
--- /dev/null
+++ b/src/math/i386/sqrtf.c
@@ -0,0 +1,8 @@
+#include <math.h>
+
+float sqrtf(float x)
+{
+ long double t;
+ __asm__ ("fsqrt" : "=t"(t) : "0"(x));
+ return (float)t;
+}
diff --git a/src/math/i386/sqrtf.s b/src/math/i386/sqrtf.s
deleted file mode 100644
index 9e944f45..00000000
--- a/src/math/i386/sqrtf.s
+++ /dev/null
@@ -1,7 +0,0 @@
-.global sqrtf
-.type sqrtf,@function
-sqrtf: flds 4(%esp)
- fsqrt
- fstps 4(%esp)
- flds 4(%esp)
- ret
next prev parent reply other threads:[~2020-01-06 17:43 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 ` Alexander Monakov [this message]
2020-01-06 18:32 ` [PATCH] math: move i386 sqrtf " 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
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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