diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/fpu/e_log10.S')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/fpu/e_log10.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/fpu/e_log10.S b/REORG.TODO/sysdeps/i386/fpu/e_log10.S new file mode 100644 index 0000000000..17277084ca --- /dev/null +++ b/REORG.TODO/sysdeps/i386/fpu/e_log10.S @@ -0,0 +1,68 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + * + * Changed to use fyl2xp1 for values near 1, <drepper@cygnus.com>. + */ + +#include <machine/asm.h> + + .section .rodata.cst8,"aM",@progbits,8 + + .p2align 3 + .type one,@object +one: .double 1.0 + ASM_SIZE_DIRECTIVE(one) + /* 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. */ + .type limit,@object +limit: .double 0.29 + ASM_SIZE_DIRECTIVE(limit) + + +#ifdef PIC +# define MO(op) op##@GOTOFF(%edx) +#else +# define MO(op) op +#endif + + .text +ENTRY(__ieee754_log10) + fldlg2 // log10(2) + fldl 4(%esp) // x : log10(2) +#ifdef PIC + LOAD_PIC_REG (dx) +#endif + fxam + fnstsw + fld %st // x : x : log10(2) + sahf + jc 3f // in case x is NaN or ħInf +4: fsubl MO(one) // x-1 : x : log10(2) + fld %st // x-1 : x-1 : x : log10(2) + fabs // |x-1| : x-1 : x : log10(2) + fcompl MO(limit) // x-1 : x : log10(2) + fnstsw // x-1 : x : log10(2) + andb $0x45, %ah + jz 2f + fxam + fnstsw + andb $0x45, %ah + cmpb $0x40, %ah + jne 5f + fabs // log10(1) is +0 in all rounding modes. +5: fstp %st(1) // x-1 : log10(2) + fyl2xp1 // log10(x) + ret + +2: fstp %st(0) // x : log10(2) + fyl2x // log10(x) + ret + +3: jp 4b // in case x is ħInf + fstp %st(1) + fstp %st(1) + ret +END (__ieee754_log10) +strong_alias (__ieee754_log10, __log10_finite) |