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/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
Primitives for some bit operations.
*/
#include "PyrPrimitive.h"
#include "VMGlobals.h"
#include "clz.h"
int prNumBits(VMGlobals *g, int numArgsPushed);
int prNumBits(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a = g->sp;
SetRaw(a, NUMBITS(slotRawInt(a)));
return errNone;
}
int prLog2Ceil(VMGlobals *g, int numArgsPushed);
int prLog2Ceil(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a = g->sp;
SetRaw(a, LOG2CEIL(slotRawInt(a)));
return errNone;
}
int prCLZ(VMGlobals *g, int numArgsPushed);
int prCLZ(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a = g->sp;
SetRaw(a, CLZ(slotRawInt(a)));
return errNone;
}
int prCTZ(VMGlobals *g, int numArgsPushed);
int prCTZ(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a = g->sp;
SetRaw(a, CTZ(slotRawInt(a)));
return errNone;
}
int prNextPowerOfTwo(VMGlobals *g, int numArgsPushed);
int prNextPowerOfTwo(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a;
a = g->sp;
SetRaw(a, NEXTPOWEROFTWO(slotRawInt(a)));
return errNone;
}
int prIsPowerOfTwo(VMGlobals *g, int numArgsPushed);
int prIsPowerOfTwo(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a = g->sp;
SetBool(a, ISPOWEROFTWO(slotRawInt(a)));
return errNone;
}
int prBinaryGrayCode(VMGlobals *g, int numArgsPushed);
int prBinaryGrayCode(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a;
a = g->sp;
SetRaw(a, GRAYCODE(slotRawInt(a)));
return errNone;
}
int prSetBit(VMGlobals *g, int numArgsPushed);
int prSetBit(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a = g->sp - 2;
PyrSlot *b = g->sp - 1;
PyrSlot *c = g->sp;
int32 bit, mask;
int err = slotIntVal(b, &bit);
if (err) return err;
bit = bit & 31;
mask = 1L << bit;
if (IsFalse(c)) {
SetRaw(a, slotRawInt(a) & ~mask);
} else {
SetRaw(a, slotRawInt(a) | mask);
}
return errNone;
}
int prHammingDistance(VMGlobals *g, int numArgsPushed);
int prHammingDistance(VMGlobals *g, int numArgsPushed)
{
PyrSlot *a = g->sp - 1;
PyrSlot *b = g->sp;
if (NotInt(a) || NotInt(b))
return errWrongType;
int aInt = slotRawInt(a);
int bInt = slotRawInt(b);
int count = 0, mask = 1;
for(int i = 0; i < 32; i++) {
if((aInt & mask) != (bInt & mask)) count = count + 1;
mask = mask << 1;
}
SetRaw(a, count);
return errNone;
}
void initBitPrimitives();
void initBitPrimitives()
{
int base, index = 0;
base = nextPrimitiveIndex();
definePrimitive(base, index++, "_NextPowerOfTwo", prNextPowerOfTwo, 1, 0);
definePrimitive(base, index++, "_IsPowerOfTwo", prIsPowerOfTwo, 1, 0);
definePrimitive(base, index++, "_CLZ", prCLZ, 1, 0);
definePrimitive(base, index++, "_CTZ", prCTZ, 1, 0);
definePrimitive(base, index++, "_NumBits", prNumBits, 1, 0);
definePrimitive(base, index++, "_Log2Ceil", prLog2Ceil, 1, 0);
definePrimitive(base, index++, "_SetBit", prSetBit, 3, 0);
definePrimitive(base, index++, "_BinaryGrayCode", prBinaryGrayCode, 1, 0);
definePrimitive(base, index++, "_HammingDistance", prHammingDistance, 2, 0);
}
#if _SC_PLUGINS_
#include "SCPlugin.h"
// export the function that SC will call to load the plug in.
#pragma export on
extern "C" { SCPlugIn* loadPlugIn(void); }
#pragma export off
// define plug in object
class APlugIn : public SCPlugIn
{
public:
APlugIn();
virtual ~APlugIn();
virtual void AboutToCompile();
};
APlugIn::APlugIn()
{
// constructor for plug in
}
APlugIn::~APlugIn()
{
// destructor for plug in
}
void APlugIn::AboutToCompile()
{
// this is called each time the class library is compiled.
initBitPrimitives();
}
// This function is called when the plug in is loaded into SC.
// It returns an instance of APlugIn.
SCPlugIn* loadPlugIn()
{
return new APlugIn();
}
#endif
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