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cse.c (fold_rtx): Use simplify_subreg. 

* cse.c (fold_rtx): Use simplify_subreg.

	* simplify-rtx.c (simplify_replace_rtx): Use simplify_gen_subreg.
	(simplify_gen_subreg): New.
	(simplify_rtx): Use simplify_subreg.
	* rtl.h (simplify_gen_subreg): Declare.

From-SVN: r42221
This commit is contained in:
Jan Hubicka 2001-05-17 20:46:58 +02:00 committed by Jan Hubicka
parent e221a0a8fb
commit 949c5d6257
4 changed files with 65 additions and 17 deletions
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9
gcc/ChangeLog
View File

@ -1,3 +1,12 @@
Thu May 17 20:43:36 CEST 2001 Jan Hubicka <jh@suse.cz>
* cse.c (fold_rtx): Use simplify_subreg.
* simplify-rtx.c (simplify_replace_rtx): Use simplify_gen_subreg.
(simplify_gen_subreg): New.
(simplify_rtx): Use simplify_subreg.
* rtl.h (simplify_gen_subreg): Declare.
2001-05-17 Mark Mitchell <mark@codesourcery.com>
* doc/install.texi: Update Solaris information.

12
gcc/cse.c
View File

@ -3408,16 +3408,8 @@ fold_rtx (x, insn)
if (folded_arg0 != SUBREG_REG (x))
{
new = 0;
if (GET_MODE_CLASS (mode) == MODE_INT
&& GET_MODE_SIZE (mode) == UNITS_PER_WORD
&& GET_MODE (SUBREG_REG (x)) != VOIDmode)
new = operand_subword (folded_arg0,
(SUBREG_BYTE (x) / UNITS_PER_WORD), 0,
GET_MODE (SUBREG_REG (x)));
if (new == 0 && subreg_lowpart_p (x))
new = gen_lowpart_if_possible (mode, folded_arg0);
new = simplify_subreg (mode, folded_arg0,
GET_MODE (SUBREG_REG (x)), SUBREG_BYTE (x));
if (new)
return new;
}

4
gcc/rtl.h
View File

@ -1331,6 +1331,10 @@ extern rtx simplify_subreg PARAMS ((enum machine_mode,
rtx,
enum machine_mode,
unsigned int));
extern rtx simplify_gen_subreg PARAMS ((enum machine_mode,
rtx,
enum machine_mode,
unsigned int));
extern rtx simplify_replace_rtx PARAMS ((rtx, rtx, rtx));
extern rtx simplify_rtx PARAMS ((rtx));

57
gcc/simplify-rtx.c
View File

@ -259,13 +259,18 @@ simplify_replace_rtx (x, old, new)
simplify_replace_rtx (XEXP (x, 2), old, new));
case 'x':
/* The only case we try to handle is a lowpart SUBREG of a single-word
CONST_INT. */
if (code == SUBREG && subreg_lowpart_p (x) && old == SUBREG_REG (x)
&& GET_CODE (new) == CONST_INT
&& GET_MODE_SIZE (GET_MODE (old)) <= UNITS_PER_WORD)
return GEN_INT (INTVAL (new) & GET_MODE_MASK (mode));
/* The only case we try to handle is a SUBREG. */
if (code == SUBREG)
{
rtx exp;
exp = simplify_gen_subreg (GET_MODE (x),
simplify_replace_rtx (SUBREG_REG (x),
old, new),
GET_MODE (SUBREG_REG (x)),
SUBREG_BYTE (x));
if (exp)
x = exp;
}
return x;
default:
@ -2385,6 +2390,37 @@ simplify_subreg (outermode, op, innermode, byte)
}
return NULL_RTX;
}
/* Make a SUBREG operation or equivalent if it folds. */
rtx
simplify_gen_subreg (outermode, op, innermode, byte)
rtx op;
unsigned int byte;
enum machine_mode outermode, innermode;
{
rtx new;
/* Little bit of sanity checking. */
if (innermode == VOIDmode || outermode == VOIDmode
|| innermode == BLKmode || outermode == BLKmode)
abort ();
if (GET_MODE (op) != innermode
&& GET_MODE (op) != VOIDmode)
abort ();
if (byte % GET_MODE_SIZE (outermode)
|| byte >= GET_MODE_SIZE (innermode))
abort ();
new = simplify_subreg (outermode, op, innermode, byte);
if (new)
return new;
if (GET_CODE (op) == SUBREG || GET_MODE (op) == VOIDmode)
return NULL_RTX;
return gen_rtx_SUBREG (outermode, op, byte);
}
/* Simplify X, an rtx expression.
Return the simplified expression or NULL if no simplifications
@ -2454,6 +2490,13 @@ simplify_rtx (x)
? GET_MODE (XEXP (x, 0))
: GET_MODE (XEXP (x, 1))),
XEXP (x, 0), XEXP (x, 1));
case 'x':
/* The only case we try to handle is a SUBREG. */
if (code == SUBREG)
return simplify_gen_subreg (mode, SUBREG_REG (x),
GET_MODE (SUBREG_REG (x)),
SUBREG_BYTE (x));
return NULL;
default:
return NULL;
}