| 0,0 → 1,38 |
|---|
| /* |
| * Written by J.T. Conklin <jtc@netbsd.org>. |
| * Public domain. |
| * |
| * Changed to use fyl2xp1 for values near 1, <drepper@cygnus.com>. |
| */ |
| |
| .file "log.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 _log |
| .def _log; .scl 2; .type 32; .endef |
| _log: |
| fldln2 /* log(2) */ |
| fldl 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 |