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rtlanal.c (auto_inc_p): New function. 

* rtlanal.c (auto_inc_p): New function.
        * rtl.h (auto_inc_p): Prototype it.
	* reload1.c (add_auto_inc_notes): New function.
	(reload): Strip REG_INC notes and call add_auto_inc_notes
	for each insn to restore them correctly.

From-SVN: r25774
This commit is contained in:
Michael Hayes 1999-03-15 01:52:49 +00:00 committed by Michael Hayes
parent 7ae575286e
commit 2dfa9a87f6
4 changed files with 78 additions and 5 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
Mon Mar 15 22:50:18 1999 Michael Hayes <m.hayes@elec.canterbury.ac.nz>
* rtlanal.c (auto_inc_p): New function.
* rtl.h (auto_inc_p): Prototype it.
* reload1.c (add_auto_inc_notes): New function.
(reload): Strip REG_INC notes and call add_auto_inc_notes
for each insn to restore them correctly.
1999-03-15 Manfred Hollstein <manfred@s-direktnet.de>
* fixinc/Makefile.in (procopen.o): List the actual

50
gcc/reload1.c
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@ -443,6 +443,9 @@ static void reload_combine_note_use PROTO((rtx *, rtx));
static void reload_combine_note_store PROTO((rtx, rtx));
static void reload_cse_move2add PROTO((rtx));
static void move2add_note_store PROTO((rtx, rtx));
#ifdef AUTO_INC_DEC
static void add_auto_inc_notes PROTO((rtx, rtx));
#endif
/* Initialize the reload pass once per compilation. */
@ -1124,11 +1127,13 @@ reload (first, global, dumpfile)
which are only valid during and after reload. */
reload_completed = 1;
/* Make a pass over all the insns and delete all USEs which we inserted
only to tag a REG_EQUAL note on them. Remove all REG_DEAD and REG_UNUSED
notes. Delete all CLOBBER insns and simplify (subreg (reg)) operands.
Also remove all REG_RETVAL and REG_LIBCALL notes since they are no longer
useful or accurate. */
/* Make a pass over all the insns and delete all USEs which we
inserted only to tag a REG_EQUAL note on them. Remove all
REG_DEAD and REG_UNUSED notes. Delete all CLOBBER insns and
simplify (subreg (reg)) operands. Also remove all REG_RETVAL and
REG_LIBCALL notes since they are no longer useful or accurate.
Strip and regenerate REG_INC notes that may have been moved
around. */
for (insn = first; insn; insn = NEXT_INSN (insn))
if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
@ -1150,6 +1155,7 @@ reload (first, global, dumpfile)
{
if (REG_NOTE_KIND (*pnote) == REG_DEAD
|| REG_NOTE_KIND (*pnote) == REG_UNUSED
|| REG_NOTE_KIND (*pnote) == REG_INC
|| REG_NOTE_KIND (*pnote) == REG_RETVAL
|| REG_NOTE_KIND (*pnote) == REG_LIBCALL)
*pnote = XEXP (*pnote, 1);
@ -1157,6 +1163,10 @@ reload (first, global, dumpfile)
pnote = &XEXP (*pnote, 1);
}
#ifdef AUTO_INC_DEC
add_auto_inc_notes (insn, PATTERN (insn));
#endif
/* And simplify (subreg (reg)) if it appears as an operand. */
cleanup_subreg_operands (insn);
}
@ -10131,3 +10141,33 @@ move2add_note_store (dst, set)
}
}
}
#ifdef AUTO_INC_DEC
static void
add_auto_inc_notes (insn, x)
rtx insn;
rtx x;
{
enum rtx_code code = GET_CODE (x);
char *fmt;
int i, j;
if (code == MEM && auto_inc_p (XEXP (x, 0)))
{
REG_NOTES (insn)
= gen_rtx_EXPR_LIST (REG_INC, XEXP (XEXP (x, 0), 0), REG_NOTES (insn));
return;
}
/* Scan all the operand sub-expressions. */
fmt = GET_RTX_FORMAT (code);
for (i = GET_RTX_LENGTH (code) - 1; i >= 0; i--)
{
if (fmt[i] == 'e')
add_auto_inc_notes (insn, XEXP (x, i));
else if (fmt[i] == 'E')
for (j = XVECLEN (x, i) - 1; j >= 0; j--)
add_auto_inc_notes (insn, XVECEXP (x, i, j));
}
}
#endif

1
gcc/rtl.h
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@ -1041,6 +1041,7 @@ extern int computed_jump_p PROTO((rtx));
typedef int (*rtx_function) PROTO((rtx *, void *));
extern int for_each_rtx PROTO((rtx *, rtx_function, void *));
extern rtx regno_use_in PROTO((int, rtx));
extern int auto_inc_p PROTO((rtx));
/* flow.c */

24
gcc/rtlanal.c
View File

@ -2235,3 +2235,27 @@ regno_use_in (regno, x)
return NULL_RTX;
}
/* Return 1 if X is an autoincrement side effect and the register is
not the stack pointer. */
int
auto_inc_p (x)
rtx x;
{
switch (GET_CODE (x))
{
case PRE_INC:
case POST_INC:
case PRE_DEC:
case POST_DEC:
case PRE_MODIFY:
case POST_MODIFY:
/* There are no REG_INC notes for SP. */
if (XEXP (x, 0) != stack_pointer_rtx)
return 1;
default:
break;
}
return 0;
}