25 lines
489 B
ArmAsm
25 lines
489 B
ArmAsm
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*/
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#include <machine/asm.h>
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RCSID("$NetBSD: e_expf.S,v 1.2 1999/07/02 15:37:34 simonb Exp $")
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/* e^x = 2^(x * log2(e)) */
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ENTRY(__ieee754_expf)
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flds 4(%esp)
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fldl2e
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fmulp /* x * log2(e) */
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fstl %st(1)
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frndint /* int(x * log2(e)) */
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fstl %st(2)
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fsubrp /* fract(x * log2(e)) */
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f2xm1 /* 2^(fract(x * log2(e))) - 1 */
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fld1
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faddp /* 2^(fract(x * log2(e))) */
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fscale /* e^x */
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fstpl %st(1)
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ret
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