26 lines
597 B
ArmAsm
26 lines
597 B
ArmAsm
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/*
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* Public domain.
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*/
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#include <machine/asm.h>
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#include <libm-alias-finite.h>
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RCSID("$NetBSD: e_acos.S,v 1.4 1995/05/08 23:44:37 jtc Exp $")
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/* acos = atan (sqrt((1-x) (1+x)) / x) */
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ENTRY(__ieee754_acos)
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fldl 4(%esp) /* x */
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fld %st /* x : x */
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fld1 /* 1 : x : x */
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fsubp /* 1 - x : x */
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fld1 /* 1 : 1 - x : x */
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fadd %st(2) /* 1 + x : 1 - x : x */
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fmulp /* 1 - x^2 : x */
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fsqrt /* sqrt (1 - x^2) : x */
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fabs
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fxch %st(1) /* x : sqrt (1 - x^2) */
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fpatan /* atan (sqrt(1 - x^2) / x) */
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ret
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END (__ieee754_acos)
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libm_alias_finite (__ieee754_acos, __acos)
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