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Starting implementation of rotatation, not yet usable.

This commit is contained in:
Frederic Petrot 2002-06-13 15:38:39 +00:00
parent cd1008706b
commit b7c115ee7e
1 changed files with 43 additions and 9 deletions
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46
alliance/src/genlib/src/dpgen_Shifter.c
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@ -25,6 +25,9 @@
Author: Frédéric Pétrot
Date : 1/10/2000
$Log: dpgen_Shifter.c,v $
Revision 1.3 2002/06/13 15:38:39 fred
Starting implementation of rotatation, not yet usable.
Revision 1.2 2002/06/12 16:11:08 fred
Minor editing modifications
@ -83,7 +86,7 @@
*/
static char rcsid[]="$Id: dpgen_Shifter.c,v 1.2 2002/06/12 16:11:08 fred Exp $";
static char rcsid[]="$Id: dpgen_Shifter.c,v 1.3 2002/06/13 15:38:39 fred Exp $";
#include "util_Defs.h"
@ -129,15 +132,18 @@ namegen(c0)
namegen(c1)
namegen(shamt)
namegen(op)
namegen(x)
/* Behavior:
o = (i op shamt);
where op is :
X0 : logical left shift
01 : logical right shift
11 : arithmetical right shift
0X0 : logical left shift
001 : logical right shift
011 : arithmetical right shift
1X0 : left rotation
1X1 : right rotation
*/
extern void dpgen_Shifter(aFunction, aAL)
long aFunction;
@ -149,16 +155,22 @@ extern void dpgen_Shifter(aFunction, aAL)
int Slices;
int BitIndex, SliceIndex;
int LeftIndex, RightIndex;
int AndIndex = 0;
int ops;
char *LSB, *MSB;
char *MuxInput0, *MuxInput1, *MuxInput2; /* Mux inputs */
int sym, mys;
modelName = va_arg (aAL, char*);
/* 0: Shifter
1: Includes also rotation */
flags = va_arg (aAL, long );
flags = 0;
n = (int)va_arg (aAL, long );
Slices = ln2p(n - 1);
#define XX_NAME GENLIB_NAME
#define MX3(c0, c1, i0, i1, i2, q) \
@ -176,9 +188,14 @@ extern void dpgen_Shifter(aFunction, aAL)
#define INV(k, i, nq) \
GENLIB_LOINS("inv_x2", XX_NAME("i_%d", k), i, nq, "vdd", "vss", NULL)
if (flags == 0)
ops = 1;
else
ops = 2;
GENLIB_DEF_LOFIG(modelName);
GENLIB_LOCON(GENLIB_BUS("op", 1, 0), 'I', GENLIB_BUS("op", 1, 0));
GENLIB_LOCON(GENLIB_BUS("op", ops, 0), 'I', GENLIB_BUS("op", ops, 0));
GENLIB_LOCON(GENLIB_BUS("shamt", Slices - 1, 0), 'I', GENLIB_BUS("shamt", Slices - 1, 0));
GENLIB_LOCON(GENLIB_BUS("i", n - 1, 0), 'I', GENLIB_BUS("i", n - 1, 0));
GENLIB_LOCON(GENLIB_BUS("o", n - 1, 0), 'O', GENLIB_BUS("o", n - 1, 0));
@ -190,7 +207,8 @@ extern void dpgen_Shifter(aFunction, aAL)
MSB = "msb"; /* intermediate signal for arith sh */
/* Arithmetic extension */
A2(0, MuxOutput(n - 1), op(1), MSB);
if (flags == 0)
A2(AndIndex++, MuxOutput(n - 1), op(1), MSB);
/* Normalizing the input signals names */
for (BitIndex = 0; BitIndex < n; BitIndex++)
@ -201,9 +219,25 @@ extern void dpgen_Shifter(aFunction, aAL)
for (BitIndex = 0; BitIndex < n; BitIndex++) {
LeftIndex = BitIndex - (1 << SliceIndex);
RightIndex = BitIndex + (1 << SliceIndex);
if (flags == 0) {
MuxInput0 = LeftIndex >= 0 ? MuxOutput(SliceIndex * n + LeftIndex) : LSB;
MuxInput1 = MuxOutput(SliceIndex * n + BitIndex);
MuxInput2 = RightIndex < n ? MuxOutput(SliceIndex * n + RightIndex) : MSB;
} else {
if (LeftIndex >= 0)
MuxInput0 = MuxOutput(SliceIndex * n + LeftIndex);
else {
MuxInput0 = x(AndIndex);
A2(AndIndex, op(2), MuxOutput(SliceIndex * n + n - 1), x(AndIndex)); AndIndex++;
}
MuxInput1 = MuxOutput(SliceIndex * n + BitIndex);
if (RightIndex < n)
MuxInput2 = MuxOutput(SliceIndex * n + RightIndex);
else {
MuxInput2 = x(AndIndex);
A2(AndIndex, op(2), MuxOutput(SliceIndex * n + n - 1), x(AndIndex)); AndIndex++;
}
}
MX3(c0(SliceIndex), c1(SliceIndex), MuxInput0, MuxInput1, MuxInput2, MuxOutput((SliceIndex + 1) * n + BitIndex));
}
}