2 * Written by J.T. Conklin <jtc@netbsd.org>.
4 * Adapted for float type by Ulrich Drepper <drepper@cygnus.com>.
6 * Changed to use fyl2xp1 for values near 1, <drepper@cygnus.com>.
9 #include <machine/asm.h>
12 .section .rodata.cst8,"aM",@progbits,8
17 ASM_TYPE_DIRECTIVE(one,@object)
19 ASM_SIZE_DIRECTIVE(one)
20 /* It is not important that this constant is precise. It is only
21 a value which is known to be on the safe side for using the
22 fyl2xp1 instruction. */
23 ASM_TYPE_DIRECTIVE(limit,@object)
25 ASM_SIZE_DIRECTIVE(limit)
29 # define MO(op) op##@GOTOFF(%edx)
35 ENTRY(__ieee754_log10f)
37 flds 4(%esp) // x : log10(2)
43 fld %st // x : x : log10(2)
45 jc 3f // in case x is NaN or ±Inf
46 4: fsubl MO(one) // x-1 : x : log10(2)
47 fld %st // x-1 : x-1 : x : log10(2)
48 fabs // |x-1| : x-1 : x : log10(2)
49 fcompl MO(limit) // x-1 : x : log10(2)
50 fnstsw // x-1 : x : log10(2)
53 fstp %st(1) // x-1 : log10(2)
57 2: fstp %st(0) // x : log10(2)
61 3: jp 4b // in case x is ±Inf
65 END (__ieee754_log10f)
66 strong_alias (__ieee754_log10f, __log10f_finite)