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105 lines
2.2 KiB
105 lines
2.2 KiB
/*
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* |-----------------------------------------------------------|
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* | Copyright (c) 1991, 1990 MIPS Computer Systems, Inc. |
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* | All Rights Reserved |
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* |-----------------------------------------------------------|
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* | Restricted Rights Legend |
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* | Use, duplication, or disclosure by the Government is |
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* | subject to restrictions as set forth in |
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* | subparagraph (c)(1)(ii) of the Rights in Technical |
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* | Data and Computer Software Clause of DFARS 252.227-7013. |
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* | MIPS Computer Systems, Inc. |
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* | 950 DeGuigne Avenue |
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* | Sunnyvale, California 94088-3650, USA |
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* |-----------------------------------------------------------|
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*/
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/* $Header: ftanh.s,v 3000.5.1.4 92/02/05 18:21:20 zaineb Exp $ */
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/* Algorithm from Cody and Waite. */
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#include <kxmips.h>
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#define ln3o2 0.54930614433405484570
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#define eps 3.72529029846191406250e-9
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#define p1 -0.3831010665e-2
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#define p0 -0.8237728127e+0
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#define q0 +0.2471319654e+1
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#define xbig 9.01091290
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#define FSIZE 16
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.text
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.globl ftanh
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.globl tanhf
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.ent ftanh
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.aent tanhf
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ftanh:
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tanhf:
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.frame sp, FSIZE, ra
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subu sp, FSIZE
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sw ra, FSIZE-4(sp)
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.prologue 1
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li.s $f8, ln3o2
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abs.s $f0, $f12
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c.lt.s $f8, $f0
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li.s $f8, eps
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bc1t callftanh2
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c.lt.s $f0, $f8
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bc1t ftanh1
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mul.s $f2, $f0, $f0
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li.s $f10, p1
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li.s $f8, q0
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mul.s $f4, $f2, $f10
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li.s $f10, p0
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add.s $f6, $f2, $f8
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add.s $f4, $f10
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mul.s $f4, $f2
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div.s $f4, $f6
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mul.s $f4, $f12
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add.s $f0, $f4, $f12
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j ret
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ftanh1:
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mov.s $f0, $f12
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j ret
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callftanh2:
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jal ftanh2
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j ret
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.end ftanh
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.ent ftanh2
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ftanh2:
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.frame sp, FSIZE, ra
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subu sp, FSIZE
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sw ra, FSIZE-4(sp)
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.prologue 1
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li.s $f10, xbig
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s.s $f12, 20(sp)
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c.ole.s $f0, $f10
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add.s $f12, $f0, $f0
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bc1f ftanh4
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jal fexp
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li.s $f10, 1.0
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li.s $f8, 2.0
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add.s $f0, $f10
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div.s $f0, $f8, $f0
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lw t0, 20(sp)
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bltz t0, 1f
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sub.s $f0, $f10, $f0
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j ret
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1: sub.s $f0, $f0, $f10
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j ret
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ftanh4:
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lw t0, 20(sp)
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li.s $f0, 1.0
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bltz t0, 1f
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j ret1
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1: neg.s $f0
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j ret1
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ret:
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lw ra, FSIZE-4(sp)
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ret1:
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addu sp, FSIZE
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j ra
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.end ftanh2
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