110 lines
3.6 KiB
C
Executable File
110 lines
3.6 KiB
C
Executable File
/*
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Copyright (C) 1994-1995 Apogee Software, Ltd.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _rt_sqrt_public
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#define _rt_sqrt_public
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/*
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FUNCTION:
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Fixed32 FixedSqrtHP(Fixed32 n);
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DESCRIPTION:
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This does a high-precision square root of a Fixed32. It has
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8.16 bit accuracy. For more speed use FixedSqrtLP().
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FUNCTION:
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Fixed32 FixedSqrtLP(Fixed32 n);
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DESCRIPTION:
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This does a low-precision square root of a Fixed32. It has
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8.8 bit accuracy. For more accuracy use FixedSqrtHP().
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*/
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long FixedSqrtLP(long n); // Low Precision (8.8)
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long FixedSqrtHP(long n); // High Precision (8.16)
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#ifdef __WATCOMC__
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#pragma aux FixedSqrtLP = \
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" xor eax, eax" \
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" mov ebx, 40000000h" \
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"sqrtLP1: mov edx, ecx" \
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" sub edx, ebx" \
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" jl sqrtLP2" \
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" sub edx, eax" \
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" jl sqrtLP2" \
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" mov ecx,edx" \
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" shr eax, 1" \
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" or eax, ebx" \
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" shr ebx, 2" \
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" jnz sqrtLP1" \
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" shl eax, 8" \
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" jmp sqrtLP3" \
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"sqrtLP2: shr eax, 1" \
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" shr ebx, 2" \
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" jnz sqrtLP1" \
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" shl eax, 8" \
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"sqrtLP3: nop" \
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parm caller [ecx] \
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value [eax] \
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modify [eax ebx ecx edx];
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#pragma aux FixedSqrtHP = \
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" xor eax, eax" \
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" mov ebx, 40000000h" \
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"sqrtHP1: mov edx, ecx" \
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" sub edx, ebx" \
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" jb sqrtHP2" \
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" sub edx, eax" \
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" jb sqrtHP2" \
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" mov ecx,edx" \
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" shr eax, 1" \
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" or eax, ebx" \
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" shr ebx, 2" \
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" jnz sqrtHP1" \
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" jz sqrtHP5" \
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"sqrtHP2: shr eax, 1" \
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" shr ebx, 2" \
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" jnz sqrtHP1" \
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"sqrtHP5: mov ebx, 00004000h" \
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" shl eax, 16" \
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" shl ecx, 16" \
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"sqrtHP3: mov edx, ecx" \
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" sub edx, ebx" \
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" jb sqrtHP4" \
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" sub edx, eax" \
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" jb sqrtHP4" \
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" mov ecx, edx" \
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" shr eax, 1" \
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" or eax, ebx" \
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" shr ebx, 2" \
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" jnz sqrtHP3" \
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" jmp sqrtHP6" \
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"sqrtHP4: shr eax, 1" \
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" shr ebx, 2" \
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" jnz sqrtHP3" \
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"sqrtHP6: nop" \
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parm caller [ecx] \
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value [eax] \
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modify [eax ebx ecx edx];
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#endif
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#endif
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