| /* | |
| * 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 ±Inf | |
| 4: fabs | |
| fcompl limit | |
| fnstsw | |
| sahf | |
| jc 2f | |
| faddl one | |
| fyl2x | |
| ret | |
| 2: fyl2xp1 | |
| ret | |
| 3: jp 4b // in case x is ±Inf | |
| fstp %st(1) | |
| fstp %st(1) | |
| ret |