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4bbac92a0a
1998-06-09 18:16 Ulrich Drepper <drepper@cygnus.com>
* math/Makefile (libm-calls): Add w_exp10 and e_exp10.
* math/libm.map: Add exp10{,f,l} and pow10{,f,l}.
* math/math_private.h: Add prototypes for __ieee754_exp10{,f,l}.
* math/bits/mathcalls.h: Add definitions for exp10 and pow10
prototypes.
* sysdeps/libm-i387/e_exp10.S: New file.
* sysdeps/libm-i387/e_exp10f.S: New file.
* sysdeps/libm-i387/e_exp10l.S: New file.
* sysdeps/libm-ieee754/e_exp10.c: New file.
* sysdeps/libm-ieee754/e_exp10f.c: New file.
* sysdeps/libm-ieee754/e_exp10l.c: New file.
* sysdeps/libm-ieee754/w_exp10.c: New file.
* sysdeps/libm-ieee754/w_exp10f.c: New file.
* sysdeps/libm-ieee754/w_exp10l.c: New file.
* sysdeps/libm-ieee754/k_standard.c: Add exception code for exp10.
1998-05-25 22:18 H.J. Lu <hjl@gnu.org>
* sysdeps/unix/sysv/linux/i386/Makefile (sysdep_headers): Add
sys/elf.h and sys/reg.h.
* sysdeps/unix/sysv/linux/i386/sys/elf.h: New file.
* sysdeps/unix/sysv/linux/i386/sys/reg.h: New file.
* sysdeps/unix/sysv/linux/i386/sys/procfs.h: New file.
* sysdeps/unix/sysv/linux/i386/sys/user.h: New file.
* sysdeps/unix/sysv/linux/sys/ptrace.h (PTRACE_GETREGS,
PTRACE_SETREGS, PTRACE_GETFPREGS, PTRACE_SETFPREGS): Added.
39 lines
879 B
ArmAsm
39 lines
879 B
ArmAsm
/*
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* Written by Ulrich Drepper.
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*/
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#include <machine/asm.h>
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/* e^x = 2^(x * log2(10)) */
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ENTRY(__ieee754_exp10f)
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flds 4(%esp)
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/* I added the following ugly construct because exp(+-Inf) resulted
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in NaN. The ugliness results from the bright minds at Intel.
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For the i686 the code can be written better.
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-- drepper@cygnus.com. */
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fxam /* Is NaN or +-Inf? */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x05, %dh
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je 1f /* Is +-Inf, jump. */
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fldl2t
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fmulp /* x * log2(10) */
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fld %st
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frndint /* int(x * log2(10)) */
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fsubr %st,%st(1) /* fract(x * log2(10)) */
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fxch
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f2xm1 /* 2^(fract(x * log2(10))) - 1 */
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fld1
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faddp /* 2^(fract(x * log2(10))) */
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fscale /* e^x */
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fstp %st(1)
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ret
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1: testl $0x200, %eax /* Test sign. */
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jz 2f /* If positive, jump. */
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fstp %st
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fldz /* Set result to 0. */
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2: ret
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END (__ieee754_exp10f)
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