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/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
* Removed header file dependency for use in libmingwex.a by
* Danny Smith <dannysmith@users.sourceforge.net>
*/
.file "log1pf.S"
.text
.align 4
/* The fyl2xp1 can only be used for values in
-1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2
0.29 is a safe value.
*/
limit: .float 0.29
one: .float 1.0
/*
* Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29,
* otherwise fyl2x with the needed extra computation.
*/
.globl _log1pf;
.def _log1pf; .scl 2; .type 32; .endef
_log1pf:
fldln2
flds 4(%esp)
fxam
fnstsw
fld %st
sahf
jc 3f // in case x is NaN or ±Inf
4: fabs
fcomps limit
fnstsw
sahf
jc 2f
fadds one
fyl2x
ret
2: fyl2xp1
ret
3: jp 4b // in case x is ±Inf
fstp %st(1)
fstp %st(1)
ret
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