48 lines
864 B
ArmAsm
48 lines
864 B
ArmAsm
|
/*
|
|||
|
|
* 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 "log1p.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: .double 0.29
|
|||
|
|
one: .double 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 _log1p;
|
|||
|
|
.def _log1p; .scl 2; .type 32; .endef
|
|||
|
|
_log1p:
|
|||
|
|
fldln2
|
|||
|
|
fldl 4(%esp)
|
|||
|
|
fxam
|
|||
|
|
fnstsw
|
|||
|
|
fld %st
|
|||
|
|
sahf
|
|||
|
|
jc 3f /* in case x is NaN or <EFBFBD>Inf */
|
|||
|
|
|
|||
|
|
4: fabs
|
|||
|
|
fcompl limit
|
|||
|
|
fnstsw
|
|||
|
|
sahf
|
|||
|
|
jc 2f
|
|||
|
|
faddl one
|
|||
|
|
fyl2x
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
2: fyl2xp1
|
|||
|
|
ret
|
|||
|
|
|
|||
|
|
3: jp 4b /* in case x is <EFBFBD>Inf */
|
|||
|
|
fstp %st(1)
|
|||
|
|
fstp %st(1)
|
|||
|
|
ret
|