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jump.c (duplicate_loop_exit_test): Strip REG_WAS_0 notes off all insns we're going to copy.

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* jump.c (duplicate_loop_exit_test): Strip REG_WAS_0 notes off all
	insns we're going to copy.
	* regclass.c (reg_scan_mark_refs): Don't test X for NULL_RTX.

From-SVN: r22887
This commit is contained in:
Bernd Schmidt 1998-10-07 03:50:05 -06:00 • committed by Jeff Law
parent 237228c033
commit d143a8907a
3 changed files with 12 additions and 16 deletions
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4
gcc/ChangeLog
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@ -21,6 +21,10 @@ Wed Oct 7 02:27:52 1998 Jeffrey A Law (law@cygnus.com)
Wed Oct 7 01:08:43 1998 Bernd Schmidt <crux@Pool.Informatik.RWTH-Aachen.DE>
* jump.c (duplicate_loop_exit_test): Strip REG_WAS_0 notes off all
insns we're going to copy.
* regclass.c (reg_scan_mark_refs): Don't test X for NULL_RTX.
* loop.c (count_one_set): Add prototype.
* caller-save.c (restore_referenced_regs): Lose mode argument.

17
gcc/jump.c
View file

@ -480,12 +480,9 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
remove_death (dreg, trial);
break;
}
#ifdef PRESERVE_DEATH_INFO_REGNO_P
/* Deleting insn could lose a death-note for SREG
so don't do it if final needs accurate
death-notes. */
if (PRESERVE_DEATH_INFO_REGNO_P (sreg)
&& (trial = find_regno_note (insn, REG_DEAD, sreg)))
/* Deleting insn could lose a death-note for SREG. */
if ((trial = find_regno_note (insn, REG_DEAD, sreg)))
{
/* Change this into a USE so that we won't emit
code for it, but still can keep the note. */
@ -497,7 +494,6 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
XEXP (trial, 1) = NULL_RTX;
}
else
#endif
delete_insn (insn);
}
}
@ -2434,8 +2430,7 @@ duplicate_loop_exit_test (loop_start)
has a REG_RETVAL or REG_LIBCALL note (hard to adjust)
is a NOTE_INSN_LOOP_BEG because this means we have a nested loop
is a NOTE_INSN_BLOCK_{BEG,END} because duplicating these notes
are not valid
is not valid.
We also do not do this if we find an insn with ASM_OPERANDS. While
this restriction should not be necessary, copying an insn with
@ -2480,6 +2475,10 @@ duplicate_loop_exit_test (loop_start)
break;
case JUMP_INSN:
case INSN:
/* The code below would grossly mishandle REG_WAS_0 notes,
so get rid of them here. */
while ((p = find_reg_note (insn, REG_WAS_0, NULL_RTX)) != 0)
remove_note (insn, p);
if (++num_insns > 20
|| find_reg_note (insn, REG_RETVAL, NULL_RTX)
|| find_reg_note (insn, REG_LIBCALL, NULL_RTX)

7
gcc/regclass.c
View file

@ -1995,13 +1995,6 @@ reg_scan_mark_refs (x, insn, note_flag, min_regno)
register rtx dest;
register rtx note;
/* This can happen when scanning insns referenced by certain notes.
It is unclear if we should be scanning such insns; until someone can
say for sure this seems like the safest fix. */
if (x == NULL_RTX)
return;
code = GET_CODE (x);
switch (code)
{