diff options
Diffstat (limited to 'winsup/mingw/mingwex/math/logl.S')
| -rw-r--r-- | winsup/mingw/mingwex/math/logl.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/math/logl.S b/winsup/mingw/mingwex/math/logl.S new file mode 100644 index 000000000..8dc144915 --- /dev/null +++ b/winsup/mingw/mingwex/math/logl.S @@ -0,0 +1,40 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + * + * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>. + * + * Removed header file dependency for use in libmingwex.a by + * Danny Smith <dannysmith@users.sourceforge.net> + */ + .file "logl.S" + .text + .align 4 +one: .double 1.0 + /* It is not important that this constant is precise. It is only + a value which is known to be on the safe side for using the + fyl2xp1 instruction. */ +limit: .double 0.29 + + .text + .align 4 +.globl _logl + .def _logl; .scl 2; .type 32; .endef +_logl: + fldln2 // log(2) + fldt 4(%esp) // x : log(2) + fld %st // x : x : log(2) + fsubl one // x-1 : x : log(2) + fld %st // x-1 : x-1 : x : log(2) + fabs // |x-1| : x-1 : x : log(2) + fcompl limit // x-1 : x : log(2) + fnstsw // x-1 : x : log(2) + andb $0x45, %ah + jz 2f + fstp %st(1) // x-1 : log(2) + fyl2xp1 // log(x) + ret + +2: fstp %st(0) // x : log(2) + fyl2x // log(x) + ret |