forked from KolibriOS/kolibrios
88 lines
880 B
ArmAsm
88 lines
880 B
ArmAsm
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/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
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.data
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yint:
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.word 0,0
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pow.LCW1:
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.word 0
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pow.LCW2:
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.word 0
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.text
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pow.LC0:
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.double 0d1.0e+00
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.global pow;
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frac:
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fstcw pow.LCW1
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fstcw pow.LCW2
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fwait
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andw $0xf3ff,pow.LCW2
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orw $0x0400,pow.LCW2
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fldcw pow.LCW2
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fldl %st(0)
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frndint
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fldcw pow.LCW1
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fxch %st(1)
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fsub %st(1),%st
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ret
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Lpow2:
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call frac
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f2xm1
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faddl pow.LC0
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fscale
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fstp %st(1)
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ret
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pow:
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fldl 12(%esp)
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fldl 4(%esp)
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ftst
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fnstsw %ax
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sahf
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jbe xltez
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fyl2x
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jmp Lpow2
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xltez:
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jb xltz
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fstp %st(0)
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ftst
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fnstsw %ax
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sahf
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ja ygtz
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jb error
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fstp %st(0)
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fld1
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fchs
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error:
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fsqrt
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ret
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ygtz:
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fstp %st(0)
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fldz
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ret
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xltz:
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fabs
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fxch %st(1)
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call frac
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ftst
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fnstsw %ax
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fstp %st(0)
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sahf
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je yisint
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fstp %st(0)
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fchs
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jmp error
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yisint:
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fistl yint
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fxch %st(1)
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fyl2x
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call Lpow2
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andl $1,yint
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jz yeven
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fchs
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yeven:
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ret
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