2024-04-16 20:21:35 +00:00
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/*
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* $Logfile: /DescentIII/Main/lib/mac/fixmac.h $
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* $Revision: 1.1.1.1 $
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* $Date: 2003/08/26 03:58:13 $
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* $Author: kevinb $
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*
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* $Log: fixmac.h,v $
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* Revision 1.1.1.1 2003/08/26 03:58:13 kevinb
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* initial 1.5 import
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*
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*
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* 2 5/10/99 10:55p Ardussi
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* changes to compile on Mac
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*
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* 2 2/27/97 5:09 PM Jeremy
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* added inline definitions of fixmul/div. Taken from Descent II's fixc.c
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*
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* 1 2/27/97 4:44 PM Jeremy
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* inline assembly language functions for PowerPC for
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* fixmul/fixdiv/fixmuldiv
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*
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* $NoKeywords: $
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*/
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#ifndef _FIXMAC_H
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#define _FIXMAC_H
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#ifdef NEEDED
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inline asm fix FixMul(fix a, fix b) {
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mullw r5, r3,
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r4 // multiply low word
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mulhw r6,
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r3,
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r4 // multiply high word (signed)
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rlwinm r3,
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r5, 16, 16,
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31 // mask off low portion of result
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rlwimi r3,
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r6, 16, 0,
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15 // insert high portion of result
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blr // return to caller
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}
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inline fix FixDiv(fix a, fix b) { return (fix)(((double)a * 65536.0) / (double)b); }
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inline fix FixMulDiv(fix a, fix b, fix c) {
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double d;
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d = (double)a * (double)b;
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return (fix)(d / (double)c);
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}
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#endif
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#endif
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