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doloop.c (doloop_modify): Prevent delete_insn() from deleting too much.

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2000-09-28  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>
	* doloop.c (doloop_modify): Prevent delete_insn() from
	deleting too much.  Prefer loop->top over loop->start as
	target for the new JUMP insn.
	(doloop_valid_p): Ignore loop with exit_count != 0.

From-SVN: r36661
This commit is contained in:
Franz Sirl 2000-09-28 22:36:49 +00:00 committed by Franz Sirl
parent 2eeb109b26
commit 1db88ef979
2 changed files with 23 additions and 5 deletions
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16
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2000-09-28 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
* doloop.c (doloop_modify): Prevent delete_insn() from
deleting too much. Prefer loop->top over loop->start as
target for the new JUMP insn.
(doloop_valid_p): Ignore loop with exit_count != 0.
2000-09-28 Philipp Thomas <pthomas@suse.de>
* invoke.texi (i386 Options): Add athlon to table of possible
@ -2674,6 +2680,16 @@ Sat Sep 2 13:58:23 2000 Marek Michalkiewicz <marekm@linux.org.pl>
* config/avr/avr.md ("*negsi2"): substitute %@ to __zero_reg__
* config/avr/libgcc.S: Lost part of the previous patch.
2000-08-31 Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
* rs6000/rs6000.h (NO_DOLLAR_IN_LABEL, DOLLARS_IN_IDENTIFIERS,
ENCODE_SECTION_INFO, ASM_OUTPUT_SPECIAL_POOL_ENTRY_P): Move from
here...
* rs6000/aix.h: ...to here.
* rs6000/linux.h (ASM_APP_ON, ASM_APP_OFF): Define to Linux-style.
* rs6000/rs6000.c (rs6000_select_section): Handle CONSTRUCTOR.
(rs6000_unique_section): Likewise.
2000-08-31 J. David Anglin <dave@hiauly1.hia.nrc.ca>
* gthr-dce.h (__gthread_objc_mutex_allocate): Create a pthread_mutex_t

12
gcc/doloop.c
View File

@ -281,7 +281,7 @@ doloop_valid_p (loop, jump_insn)
statement within a loop will generate multiple loop exits.
Another example of a loop that currently generates multiple exit
targets is for (i = 0; i < (foo ? 8 : 4); i++) { }. */
if (loop_info->has_multiple_exit_targets)
if (loop_info->has_multiple_exit_targets || loop->exit_count)
{
if (loop_dump_stream)
fprintf (loop_dump_stream,
@ -415,14 +415,16 @@ doloop_modify (loop, iterations, iterations_max,
fputs (" iterations).", loop_dump_stream);
}
/* Emit the label that will delimit the top of the loop.
This has to be done before the delete_insn call below, to prevent
delete_insn from deleting too much. */
emit_label_after (start_label, loop->top ? loop->top : loop->start);
LABEL_NUSES (start_label)++;
/* Discard original jump to continue loop. The original compare
result may still be live, so it cannot be discarded explicitly. */
delete_insn (jump_insn);
/* Emit the label that will delimit the start of the loop. */
emit_label_after (start_label, loop->start);
LABEL_NUSES (start_label)++;
counter_reg = XEXP (condition, 0);
if (GET_CODE (counter_reg) == PLUS)
counter_reg = XEXP (counter_reg, 0);