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#include <u.h>
#include <libc.h>
#include <bio.h>
#include "apl9.h"
Array *inttofloatarray(Array *);
int datasizes[] = {
[AtypeInt] = sizeof(vlong),
[AtypeFloat] = sizeof(double),
[AtypeRune] = sizeof(Rune),
[AtypeArray] = sizeof(Array *)
};
Array *
mkscalarint(vlong i)
{
Array *a = allocarray(AtypeInt, 0, 1);
a->intdata[0] = i;
return a;
}
Array *
mkscalarfloat(double f)
{
Array *a = allocarray(AtypeFloat, 0, 1);
a->floatdata[0] = f;
return a;
}
Array *
mkscalarrune(Rune r)
{
Array *a = allocarray(AtypeRune, 0, 1);
a->runedata[0] = r;
return a;
}
Array *
mkrunearray(Rune *str)
{
Array *a = allocarray(AtypeRune, 1, runestrlen(str));
a->shape[0] = a->size;
for(int i = 0; i < a->size; i++)
a->runedata[i] = str[i];
return a;
}
Array *
duparray(Array *a)
{
Array *b = allocarray(a->type, a->rank, a->size);
memcpy(b->shape, a->shape, sizeof(int) * a->rank);
memcpy(b->rawdata, a->rawdata, datasizes[a->type]*a->size);
if(b->type == AtypeArray)
for(int i = 0; i < b->size; i++)
incref(b->arraydata[i]);
return b;
}
int
simplearray(Array *a)
{
return a->type != AtypeArray;
}
int
simplescalar(Array *a)
{
return a->rank == 0 && a->type != AtypeArray;
}
Array *
extend(Array *a, Array *b)
{
/* extend the singleton a to the shape of b */
Array *shape = fnShape(b);
Array *res = fnReshape(shape, a);
freearray(shape);
return res;
}
int
scalarextend(Array *a, Array *b, Array **aa, Array **bb)
{
/* Extend the arrays a and b to have the same shape.
The resulting arrays are stored in aa and bb,
except when the ranks don't match or extension can't
happen, in which case the function returns 0 and
aa and bb are unchanged.
*/
if(a->size == 1 && b->size != 1){
*aa = extend(a, b);
*bb = fnSame(b);
}else if(b->size == 1 && a->size != 1){
*aa = fnSame(a);
*bb = extend(b, a);
}else if(a->size == b->size && a->rank == b->rank){
/* Check that each dimension matches */
for(int i = 0; i < a->rank; i++)
if(a->shape[i] != b->shape[i])
return 0;
*aa = fnSame(a);
*bb = fnSame(b);
}else
return 0;
return 1;
}
Array *
inttofloatarray(Array *a)
{
Array *b = allocarray(AtypeFloat, a->rank, a->size);
for(int i = 0; i < a->rank; i++)
b->shape[i] = a->shape[i];
for(int i = 0; i < a->size; i++)
b->floatdata[i] = a->intdata[i];
return b;
}
int
commontype(Array *a, Array *b, Array **aa, Array **bb, int forcefloat)
{
/* When A and B are numeric arrays, set aa and bb
to arrays that have compatible types, with the same data.
*/
if(forcefloat){
*aa = a->type == AtypeFloat ? fnSame(a) : inttofloatarray(a);
*bb = b->type == AtypeFloat ? fnSame(b) : inttofloatarray(b);
}else if(a->type == b->type){
*aa = fnSame(a);
*bb = fnSame(b);
}else if(a->type == AtypeFloat && b->type == AtypeInt){
*aa = fnSame(a);
*bb = inttofloatarray(b);
}else if(a->type == AtypeInt && b->type == AtypeFloat){
*aa = inttofloatarray(a);
*bb = fnSame(b);
}else
return 0;
return 1;
}
Array *
arrayitem(Array *a, int index)
{
Array *res = nil;
switch(a->type){
case AtypeInt:
res = mkscalarint(a->intdata[index]);
break;
case AtypeFloat:
res = mkscalarfloat(a->floatdata[index]);
break;
case AtypeRune:
res = mkscalarrune(a->runedata[index]);
break;
case AtypeArray:
res = a->arraydata[index];
incref(res);
break;
default:
print("Unhandled case in arrayitem()\n");
exits(nil);
}
return res;
}
Array *
simplifyarray(Array *a)
{
/* simplify an array if possible. */
if(a->type != AtypeArray || a->size == 0)
return fnSame(a);
int type = a->arraydata[0]->type;
int canfloat = type == AtypeFloat || type == AtypeInt;
int sametype = 1;
int i;
for(i = 0; i < a->size; i++){
int t = a->arraydata[i]->type;
canfloat = canfloat && (t == AtypeFloat || t == AtypeInt);
sametype = sametype && (t == type);
if(a->arraydata[i]->rank != 0)
return fnSame(a); /* cannot be simplified */
}
if(sametype){
Array *b = allocarray(type, a->rank, a->size);
b->stranded = a->stranded;
for(i = 0; i < a->rank; i++)
b->shape[i] = a->shape[i];
for(i = 0; i < a->size; i++)
memcpy(b->rawdata + i * datasizes[type], a->arraydata[i]->rawdata, datasizes[type]);
return b;
}else if(canfloat){
Array *b = allocarray(AtypeFloat, a->rank, a->size);
b->stranded = a->stranded;
for(i = 0; i < a->rank; i++)
b->shape[i] = a->shape[i];
for(i = 0; i < a->size; i++){
if(a->arraydata[i]->type == AtypeFloat)
b->floatdata[i] = a->arraydata[i]->floatdata[0];
else
b->floatdata[i] = a->arraydata[i]->intdata[0];
}
return b;
}else
return fnSame(a);
}
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