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/* floatop.c - software operations on floats and doubles for bcc */
/* Copyright (C) 1992 Bruce Evans */
#include "bcc.h"
#include "gencode.h"
#include "reg.h"
#include "sc.h"
#include "scan.h"
#include "type.h"
/*-----------------------------------------------------------------------------
f_indirect(target leaf)
make the float or double target indirect if it is not already
return nonzero iff the result is a temp double on the base of the stack
-----------------------------------------------------------------------------*/
PUBLIC bool_pt f_indirect(target)
struct symstruct *target;
{
if (target->indcount == 0)
{
if (target->storage == CONSTANT)
{
#ifdef I80386
if (i386_32)
{
if (target->type->scalar & FLOAT)
{
float val;
val = *target->offset.offd;
push(constsym(((value_t *) &val)[0]));
}
else
{
push(constsym(((value_t *) target->offset.offd)[1]));
push(constsym(((value_t *) target->offset.offd)[0]));
}
}
else
#endif
{
if (target->type->scalar & FLOAT)
{
float val = *target->offset.offd;
push(constsym( ((unsigned short*) &val)[1] ));
push(constsym( ((unsigned short*) &val)[0] ));
}
else
{
push(constsym(((unsigned short*) target->offset.offd)[3]));
push(constsym(((unsigned short*) target->offset.offd)[2]));
push(constsym(((unsigned short*) target->offset.offd)[1]));
push(constsym(((unsigned short*) target->offset.offd)[0]));
}
}
}
else if (target->type->scalar & FLOAT)
pushlist(target->storage); /* XXX - floatregs */
else
pushlist(doubleregs);
onstack(target);
}
return target->flags == TEMP && target->type->scalar & DOUBLE
&& target->offset.offi == sp;
}
/*-----------------------------------------------------------------------------
float1op(operation code, source leaf)
handles all flop unary operations except inc/dec
result is double on stack (or in condition codes for EQOP)
-----------------------------------------------------------------------------*/
PUBLIC void float1op(op, source)
op_pt op;
struct symstruct *source;
{
saveopreg();
pointat(source);
if ((op_t) op == NEGOP)
call("Fneg");
else /* op == EQOP */
call("Ftst");
outntypechar(source->type);
if ((op_t) op != EQOP)
justpushed(source);
restoreopreg();
}
/*-----------------------------------------------------------------------------
floatop(operation code, source leaf, target leaf)
handles all flop binary operations
result is double on stack (or in condition codes for EQOP)
----------------------------------------------------------------------------*/
PUBLIC void floatop(op, source, target)
op_pt op;
struct symstruct *source;
struct symstruct *target;
{
store_t regmark;
bool_t sflag;
regmark = reguse;
saveopreg();
(void) f_indirect(source);
if (!(reguse & OPREG) && (source->storage == OPREG))
{
reguse |= source->storage;
saveopreg();
}
fpush(target);
sflag = TRUE;
if (source->flags != TEMP || source->offset.offi != sp + dtypesize)
{
sflag = FALSE;
if (source->storage == OPREG)
restoreopreg();
pointat(source);
}
switch ((op_t) op)
{
case ADDOP:
call("Fadd");
break;
case DIVOP:
call("Fdiv");
break;
case EQOP:
call("Fcomp");
sp += dtypesize; /* target is popped */
break; /* target symbol now invalid but is not used */
case MULOP:
call("Fmul");
break;
case SUBOP:
call("Fsub");
break;
}
if (sflag)
{
outnl();
sp += dtypesize; /* source is popped */
}
else
outntypechar(source->type);
onstack(target);
reguse = regmark; /* early so opreg is not reloaded if source */
restoreopreg();
}
/*-----------------------------------------------------------------------------
fpush(source leaf of scalar type)
converts source to double and pushes it to stack
OPREG must be free
-----------------------------------------------------------------------------*/
PUBLIC void fpush(source)
struct symstruct *source;
{
scalar_t scalar;
if ((scalar = source->type->scalar) & RSCALAR)
{
if (f_indirect(source))
return;
pointat(source);
}
else if (scalar & DLONG)
load(source, OPREG);
else
load(source, DREG);
call("Fpush");
if (scalar & UNSIGNED)
outbyte('u');
outntypechar(source->type);
justpushed(source);
}
/*-----------------------------------------------------------------------------
justpushed(target leaf)
records that target has just been pushed to a double on the stack
-----------------------------------------------------------------------------*/
PUBLIC void justpushed(target)
struct symstruct *target;
{
sp -= dtypesize;
onstack(target);
target->type = dtype;
}
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