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Fork of the OpenLibm math library with fx-9860G and fx-CG 50 support.
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Jeff Walden 787652b054
msun: signed overflow in atan2 
As a component of atan2(y, x), the case of x == 1.0 is farmed out to
atan(y). The current implementation of this comparison is vulnerable
to signed integer underflow (that is, undefined behavior), and it's
performed in a somewhat more complicated way than it need be. Change
it to not be quite so cute, rather directly comparing the high/low
bits of x to the specific IEEE-754 bit pattern that encodes 1.0.

Note that while there are three different e_atan* files in the
relevant directory, only this one needs fixing. e_atan2f.c already
compares against the full bit pattern encoding 1.0f, while
e_atan2l.cuses bitwise-ands/ors/nots and so doesn't require a change.

Incorporated from FreeBSD source tree. See:
b21ccf63f2
2018-04-07 10:35:06 -07:00
aarch64 Cleanup ARCH handling, reorganize AArch64 and Make.inc. 2017-01-16 11:44:14 -08:00
amd64 Fix undefined reference to __fpgetprec on i386 2016-06-23 23:32:31 -04:00
arm Remove unused Symbol.map files. 2015-02-01 19:41:55 +05:30
bsdsrc WIP: Enable build on aarch64 2016-04-08 19:37:13 +02:00
i387 Fix invalid assembly directive caught by clang 2016-08-21 18:45:29 -04:00
include Fix arm floating-point status register code 2017-01-16 11:44:14 -08:00
ld80 Fix undefined reference to __fpgetprec on i386 2016-06-23 23:32:31 -04:00
ld128 Fix compilation on AArch64 2017-10-21 09:58:16 -04:00
powerpc Support powerpc 2016-02-23 11:08:14 +00:00
src msun: signed overflow in atan2 2018-04-07 10:35:06 -07:00
test test: update ulps for yn 2017-10-17 09:52:21 +08:00
.gitignore add .pc to .gitignore 2014-06-20 10:08:16 -04:00
.mailmap Add mailmap 2012-08-24 20:53:18 +05:30
.travis.yml Add testing for ppc64le and arm architectures on Travis 2017-01-16 11:44:15 -08:00
LICENSE.md README and LICENSE updates. 2014-12-05 00:44:29 +05:30
Make.inc Build with Clang on OpenBSD 2018-04-06 14:04:45 -07:00
Makefile Use cp -RpP instead of cp -a 2018-04-06 14:06:14 -07:00
openlibm.pc.in Added pkg-config support 2014-05-19 15:30:10 +01:00
README.md Build with Clang on OpenBSD 2018-04-06 14:04:45 -07:00

README.md

OpenLibm

Build Status

OpenLibm is an effort to have a high quality, portable, standalone C mathematical library (libm). It can be used standalone in applications and programming language implementations.

The project was born out of a need to have a good libm for the Julia programming langage that worked consistently across compilers and operating systems, and in 32-bit and 64-bit environments.

Platform support

OpenLibm builds on Linux, Mac OS X, Windows, FreeBSD, OpenBSD, and DragonFly BSD. It builds with both GCC and clang. Although largely tested and widely used on x86 architectures, OpenLibm also supports ARM and PowerPC.

Build instructions

  1. Use GNU Make to build OpenLibm. This is make on most systems, but gmake on BSDs.
  2. Use make USEGCC=1 to build with GCC. This is the default on Linux and Windows.
  3. Use make USECLANG=1 to build with clang. This is the default on OS X, FreeBSD, and OpenBSD.
  4. Architectures are auto-detected. Use make ARCH=i386 to force a build for i386. Other supported architectures are i486, i586, and i686. GCC 4.8 is the minimum requirement for correct codegen on older 32-bit architectures.

Acknowledgements

PowerPC support for openlibm was graciously sponsored by IBM.