/* Middle-to-low level generation of rtx code and insns.
- This file contains the functions `gen_rtx', `gen_reg_rtx'
- and `gen_label_rtx' that are the usual ways of creating rtl
- expressions for most purposes.
+ This file contains the functions `gen_reg_rtx' and `gen_label_rtx'
+ that are the usual ways of creating rtl expressions for most
+ purposes.
It also has the functions for creating insns and linking
them in the doubly-linked chain.
The patterns of the insns are created by machine-dependent
routines in insn-emit.c, which is generated automatically from
- the machine description. These routines use `gen_rtx' to make
- the individual rtx's of the pattern; what is machine dependent
- is the kind of rtx's they make and what arguments they use. */
+ the machine description. These routines use `gen_rtx_fmt_ee' and
+ others to make the individual rtx's of the pattern; what is machine
+ dependent is the kind of rtx's they make and what arguments they
+ use. */
#include "config.h"
#include "system.h"
subreg_lowpart_offset (mode, inmode));
}
\f
-/* rtx gen_rtx (code, mode, [element1, ..., elementn])
-**
-** This routine generates an RTX of the size specified by
-** <code>, which is an RTX code. The RTX structure is initialized
-** from the arguments <element1> through <elementn>, which are
-** interpreted according to the specific RTX type's format. The
-** special machine mode associated with the rtx (if any) is specified
-** in <mode>.
-**
-** gen_rtx can be invoked in a way which resembles the lisp-like
-** rtx it will generate. For example, the following rtx structure:
-**
-** (plus:QI (mem:QI (reg:SI 1))
-** (mem:QI (plusw:SI (reg:SI 2) (reg:SI 3))))
-**
-** ...would be generated by the following C code:
-**
-** gen_rtx_PLUS (QImode,
-** gen_rtx_MEM (QImode,
-** gen_rtx_REG (SImode, 1)),
-** gen_rtx_MEM (QImode,
-** gen_rtx_PLUS (SImode,
-** gen_rtx_REG (SImode, 2),
-** gen_rtx_REG (SImode, 3)))),
-*/
-
-/*VARARGS2*/
-rtx
-gen_rtx (enum rtx_code code, enum machine_mode mode, ...)
-{
- int i; /* Array indices... */
- const char *fmt; /* Current rtx's format... */
- rtx rt_val; /* RTX to return to caller... */
- va_list p;
-
- va_start (p, mode);
-
- switch (code)
- {
- case CONST_INT:
- rt_val = gen_rtx_CONST_INT (mode, va_arg (p, HOST_WIDE_INT));
- break;
-
- case CONST_DOUBLE:
- {
- HOST_WIDE_INT arg0 = va_arg (p, HOST_WIDE_INT);
- HOST_WIDE_INT arg1 = va_arg (p, HOST_WIDE_INT);
-
- rt_val = immed_double_const (arg0, arg1, mode);
- }
- break;
-
- case REG:
- rt_val = gen_rtx_REG (mode, va_arg (p, int));
- break;
-
- case MEM:
- rt_val = gen_rtx_MEM (mode, va_arg (p, rtx));
- break;
-
- default:
- rt_val = rtx_alloc (code); /* Allocate the storage space. */
- rt_val->mode = mode; /* Store the machine mode... */
-
- fmt = GET_RTX_FORMAT (code); /* Find the right format... */
- for (i = 0; i < GET_RTX_LENGTH (code); i++)
- {
- switch (*fmt++)
- {
- case '0': /* Field with unknown use. Zero it. */
- X0EXP (rt_val, i) = NULL_RTX;
- break;
-
- case 'i': /* An integer? */
- XINT (rt_val, i) = va_arg (p, int);
- break;
-
- case 'w': /* A wide integer? */
- XWINT (rt_val, i) = va_arg (p, HOST_WIDE_INT);
- break;
-
- case 's': /* A string? */
- XSTR (rt_val, i) = va_arg (p, char *);
- break;
-
- case 'e': /* An expression? */
- case 'u': /* An insn? Same except when printing. */
- XEXP (rt_val, i) = va_arg (p, rtx);
- break;
-
- case 'E': /* An RTX vector? */
- XVEC (rt_val, i) = va_arg (p, rtvec);
- break;
-
- case 'b': /* A bitmap? */
- XBITMAP (rt_val, i) = va_arg (p, bitmap);
- break;
-
- case 't': /* A tree? */
- XTREE (rt_val, i) = va_arg (p, tree);
- break;
-
- default:
- abort ();
- }
- }
- break;
- }
-
- va_end (p);
- return rt_val;
-}
-
/* gen_rtvec (n, [rt1, ..., rtn])
**
** This routine creates an rtvec and stores within it the
/* Create the unique rtx's for certain rtx codes and operand values. */
- /* Don't use gen_rtx here since gen_rtx in this case
+ /* Don't use gen_rtx_CONST_INT here since gen_rtx_CONST_INT in this case
tries to use these variables. */
for (i = - MAX_SAVED_CONST_INT; i <= MAX_SAVED_CONST_INT; i++)
const_int_rtx[i + MAX_SAVED_CONST_INT] =
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