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| author | Ulrich Drepper <drepper@redhat.com> | 2001-02-17 16:54:13 +0000 |
|---|---|---|
| committer | Ulrich Drepper <drepper@redhat.com> | 2001-02-17 16:54:13 +0000 |
| commit | 63640cb777a26b684f44a1786c1384d3a96a8825 (patch) | |
| tree | 9ed7ce04cdc72dd2a25d903adfc5333514c68bb7 /sysdeps/i386/fpu/e_exp2.S | |
| parent | d313277ad2a2a7a292705a5d9c9a47709e759f42 (diff) | |
| download | glibc-63640cb777a26b684f44a1786c1384d3a96a8825.tar.gz glibc-63640cb777a26b684f44a1786c1384d3a96a8825.tar.xz glibc-63640cb777a26b684f44a1786c1384d3a96a8825.zip | |
Update.
2001-02-17 Ulrich Drepper <drepper@redhat.com> * 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.
Diffstat (limited to 'sysdeps/i386/fpu/e_exp2.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_exp2.S | 37 |
1 files changed, 37 insertions, 0 deletions
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 <jtc@netbsd.org>. + * Adapted for exp2 by Ulrich Drepper <drepper@cygnus.com>. + * Public domain. + */ + +#include <machine/asm.h> + +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) |