From 63640cb777a26b684f44a1786c1384d3a96a8825 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Sat, 17 Feb 2001 16:54:13 +0000 Subject: Update. 2001-02-17 Ulrich Drepper * sysdeps/generic/s_exp2l.c: Renamed to... * sysdeps/generic/s_exp2l.c: ...this. New file. * sysdeps/i386/fpu/s_exp2.S: Renamed to... * sysdeps/i386/fpu/s_exp2.S: ...this. New file. * sysdeps/i386/fpu/s_exp2f.S: Renamed to... * sysdeps/i386/fpu/s_exp2f.S: ...this. New file. * sysdeps/i386/fpu/s_exp2l.S: Renamed to... * sysdeps/i386/fpu/s_exp2l.S: ...this. New file. * sysdeps/ieee754/flt-32/s_exp2f.c: Renamed to... * sysdeps/ieee754/flt-32/s_exp2f.c: ...this. New file. * sysdeps/ieee754/dbl-64/s_exp2.c: Renamed to... * sysdeps/ieee754/dbl-64/s_exp2.c: ...this. New file. * sysdeps/m68k/fpu/s_exp2.c: Renamed to... * sysdeps/m68k/fpu/s_exp2.c: ...this. New file. * sysdeps/m68k/fpu/s_exp2f.c: Renamed to... * sysdeps/m68k/fpu/s_exp2f.c: ...this. New file. * sysdeps/m68k/fpu/s_exp2l.c: Renamed to... * sysdeps/m68k/fpu/s_exp2l.c: ...this. New file. --- sysdeps/i386/fpu/e_exp2.S | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 sysdeps/i386/fpu/e_exp2.S (limited to 'sysdeps/i386/fpu/e_exp2.S') diff --git a/sysdeps/i386/fpu/e_exp2.S b/sysdeps/i386/fpu/e_exp2.S new file mode 100644 index 0000000000..778c0c0eb6 --- /dev/null +++ b/sysdeps/i386/fpu/e_exp2.S @@ -0,0 +1,37 @@ +/* + * Written by J.T. Conklin . + * Adapted for exp2 by Ulrich Drepper . + * Public domain. + */ + +#include + +ENTRY(__ieee754_exp2) + fldl 4(%esp) +/* I added the following ugly construct because exp(+-Inf) resulted + in NaN. The ugliness results from the bright minds at Intel. + For the i686 the code can be written better. + -- drepper@cygnus.com. */ + fxam /* Is NaN or +-Inf? */ + fstsw %ax + movb $0x45, %dh + andb %ah, %dh + cmpb $0x05, %dh + je 1f /* Is +-Inf, jump. */ + fld %st + frndint /* int(x) */ + fsubr %st,%st(1) /* fract(x) */ + fxch + f2xm1 /* 2^(fract(x)) - 1 */ + fld1 + faddp /* 2^(fract(x)) */ + fscale /* e^x */ + fstp %st(1) + ret + +1: testl $0x200, %eax /* Test sign. */ + jz 2f /* If positive, jump. */ + fstp %st + fldz /* Set result to 0. */ +2: ret +END (__ieee754_exp2) -- cgit 1.4.1