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/* Subroutines for insn-output.c for Convex.
Copyright (C) 1989,1991 Free Software Foundation, Inc.
This file is part of GNU CC.
GNU CC 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 1, or (at your option)
any later version.
GNU CC 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 GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "config.h"
#include "rtl.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "real.h"
#include "insn-config.h"
#include "conditions.h"
#include "insn-flags.h"
#include "output.h"
#include "insn-attr.h"
/* Boolean to keep track of whether the current section is .text or not.
Used by .align handler in convex.h. */
int current_section_is_text;
/* set_cmp saves the operands of a "cmp" insn, along with the type character
* to be used in the compare instruction.
*
* gen_cmp finds out what comparison is to be performed and outputs the
* necessary instructions, e.g.
* "eq.w a1,a2\;jbra.t L5"
* for (cmpsi a1 a2) (beq L5) */
static rtx xop0, xop1;
static char typech, regch;
char *
set_cmp (op0, op1, typechr)
rtx op0, op1;
char typechr;
{
xop0 = op0;
xop1 = op1;
typech = typechr;
if (GET_CODE (op0) == REG)
regch = A_REGNO_P (REGNO (op0)) ? 'a' : 's';
else if (GET_CODE (op1) == REG)
regch = A_REGNO_P (REGNO (op1)) ? 'a' : 's';
else abort ();
return "";
}
char *
gen_cmp (label, cmpop, tf)
rtx label;
char *cmpop;
char tf;
{
char buf[80];
char revop[4];
rtx ops[3];
ops[2] = label;
/* Constant must be first; swap operands if necessary.
If lt, le, ltu, leu are swapped, change to le, lt, leu, ltu
and reverse the sense of the jump. */
if (CONSTANT_P (xop1))
{
ops[0] = xop1;
ops[1] = xop0;
if (cmpop[0] == 'l')
{
bcopy (cmpop, revop, sizeof revop);
revop[1] ^= 'e' ^ 't';
tf ^= 't' ^ 'f';
cmpop = revop;
}
}
else
{
ops[0] = xop0;
ops[1] = xop1;
}
sprintf (buf, "%s.%c %%0,%%1\n\tjbr%c.%c %%l2", cmpop, typech, regch, tf);
output_asm_insn (buf, ops);
return "";
}
/* Routines to separate CONST_DOUBLEs into component parts. */
int
const_double_high_int (x)
rtx x;
{
if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT)
return CONST_DOUBLE_LOW (x);
else
return CONST_DOUBLE_HIGH (x);
}
int
const_double_low_int (x)
rtx x;
{
if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT)
return CONST_DOUBLE_HIGH (x);
else
return CONST_DOUBLE_LOW (x);
}
/* Return the number of args in the call insn X. */
static int
call_num_args (x)
rtx x;
{
if (GET_CODE (x) == CALL)
return INTVAL (x->fld[1].rtx);
if (GET_CODE (x) == SET)
return call_num_args (SET_SRC (x));
abort ();
}
/* Scan forward from a call to decide whether we need to reload AP
from 12(FP) after it. We need to if there can be a reference to
arg_pointer_rtx before the next call, which will clobber AP.
Look forward in the instruction list until encountering a call
(don't need the load), or a reference to AP (do need it), or
a jump (don't know, do the load). */
static int
ap_reload_needed (insn)
rtx insn;
{
for (;;)
{
insn = NEXT_INSN (insn);
switch (GET_CODE (insn))
{
case JUMP_INSN:
/* Basic block ends. If return, no AP needed, else assume it is. */
return GET_CODE (PATTERN (insn)) != RETURN;
case CALL_INSN:
/* A subsequent call. AP isn't needed unless the call itself
requires it. But zero-arg calls don't clobber AP, so
don't terminate the search in that case. */
if (reg_mentioned_p (arg_pointer_rtx, PATTERN (insn)))
return 1;
if (! TARGET_ARGCOUNT && call_num_args (PATTERN (insn)) == 0)
break;
return 0;
case BARRIER:
/* Barrier, don't need AP. */
return 0;
case INSN:
/* Other insn may need AP; if not, keep looking. */
if (reg_mentioned_p (arg_pointer_rtx, PATTERN (insn)))
return 1;
}
}
}
/* Output the insns needed to do a call. */
char *
output_call (insn, address, argcount)
rtx insn, address, argcount;
{
int set_ap = TARGET_ARGCOUNT || argcount != const0_rtx;
/* If AP is used by the call address, evaluate the address into a temp. */
if (reg_mentioned_p (arg_pointer_rtx, address))
if (set_ap)
{
address = XEXP (address, 0);
output_asm_insn ("ld.w %0,a1", &address);
address = gen_rtx (MEM, QImode, gen_rtx (REG, Pmode, 9));
}
/* If there are args, point AP to them. */
if (set_ap)
output_asm_insn ("mov sp,ap");
/* If we are passing an arg count, convert it to words and push it. */
if (TARGET_ARGCOUNT)
{
argcount = gen_rtx (CONST_INT, VOIDmode, (INTVAL (argcount) + 3) / 4);
output_asm_insn ("pshea %a0", &argcount);
}
/* The call. */
output_asm_insn ("calls %0", &address);
/* If we clobbered AP, reload it if it is live. */
if (set_ap)
if (ap_reload_needed (insn))
output_asm_insn ("ld.w 12(fp),ap");
/* If we pushed an arg count, pop it and the args. */
if (TARGET_ARGCOUNT)
{
argcount = gen_rtx (CONST_INT, VOIDmode, INTVAL (argcount) * 4 + 4);
output_asm_insn ("add.w %0,sp", &argcount);
}
return "";
}
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