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94 lines
1.5 KiB
94 lines
1.5 KiB
page ,132
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title 87trig - trigonometric functions - SIN, COS, TAN
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;***
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;87trig.asm - trigonometric functions - SIN, COS, TAN
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;
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; Copyright (c) 1984-2001, Microsoft Corporation. All rights reserved.
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;
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;Purpose:
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; Support for SIN, COS, TAN
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;
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;Revision History:
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;
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; 11-06-91 GDP rewritten for 386
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;
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;*******************************************************************************
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.xlist
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include cruntime.inc
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include mrt386.inc
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include elem87.inc
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.list
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.data
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extrn _piby2:tbyte
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staticT _piby4, 03FFEC90FDAA22168C235R ; pi/4
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staticD _plossval, 04D000000R ; 2^27
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staticD _tlossval, 04F000000R ; 2^31
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CODESEG
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extrn _rtindfnpop:near
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extrn _rtonenpop:near
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extrn _rttosnpop:near
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extrn _rtinfnpopse:near
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extrn _rttosnpop:near
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extrn _rttosnpopde:near
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extrn _tosnan1:near
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;----------------------------------------------------------
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;
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; FORWARD TRIGONOMETRIC FUNCTIONS
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;
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;----------------------------------------------------------
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;
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; INPUTS - The argument is the stack top.
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; The sign of argument is the 04h bit of CL.
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;
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; OUTPUT - The result is the stack top.
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;
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;----------------------------------------------------------
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jmponC2 macro tag
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fstsw ax
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fwait
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sahf
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JSP tag
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endm
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labelNP _fFCOS, PUBLIC
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lab fFCOS
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fcos
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jmponC2 ArgTooLarge
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ret
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labelNP _fFSIN, PUBLIC
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lab fFSIN
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fsin
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jmponC2 ArgTooLarge
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ret
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lab fFTAN
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fptan
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fstsw ax
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fstp st(0) ; pop TOS (fptan pushed an extra value)
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sahf
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JSP ArgTooLarge
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ret
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lab ArgTooLarge
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mov DSF.ErrorType, TLOSS ; set TLOSS error
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jmp _rtindfnpop
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end
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