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regmove.c (combine_stack_adjustments_for_block): Avoid emitting a stack adjustment of zero bytes.

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* regmove.c (combine_stack_adjustments_for_block): Avoid
        emitting a stack adjustment of zero bytes.  Let delete_insn
        update bb->head.

Co-Authored-By: Richard Henderson <rth@redhat.com>

From-SVN: r51628
This commit is contained in:
Roger Sayle 2002-03-31 03:34:55 +00:00 committed by Richard Henderson
parent 33074e5fe7
commit 78414d74b1
2 changed files with 28 additions and 27 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2002-03-30 Roger Sayle <roger@eyesopen.com>
Richard Henderson <rth@redhat.com>
* regmove.c (combine_stack_adjustments_for_block): Avoid
emitting a stack adjustment of zero bytes. Let delete_insn
update bb->head.
2002-03-30 Richard Henderson <rth@redhat.com>
* config/sparc/sparc.c: Remove all references to TARGET_EPILOGUE.

48
gcc/regmove.c
View File

@ -2331,19 +2331,17 @@ combine_stack_adjustments_for_block (bb)
HOST_WIDE_INT last_sp_adjust = 0;
rtx last_sp_set = NULL_RTX;
struct csa_memlist *memlist = NULL;
rtx pending_delete;
rtx insn, next;
rtx insn, next, set;
struct record_stack_memrefs_data data;
bool end_of_block = false;
for (insn = bb->head; ; insn = next)
for (insn = bb->head; !end_of_block ; insn = next)
{
rtx set;
pending_delete = NULL_RTX;
end_of_block = insn == bb->end;
next = NEXT_INSN (insn);
if (! INSN_P (insn))
goto processed;
continue;
set = single_set_for_csa (insn);
if (set)
@ -2365,7 +2363,7 @@ combine_stack_adjustments_for_block (bb)
{
last_sp_set = insn;
last_sp_adjust = this_adjust;
goto processed;
continue;
}
/* If not all recorded memrefs can be adjusted, or the
@ -2397,9 +2395,9 @@ combine_stack_adjustments_for_block (bb)
this_adjust))
{
/* It worked! */
pending_delete = insn;
delete_insn (insn);
last_sp_adjust += this_adjust;
goto processed;
continue;
}
}
@ -2418,16 +2416,20 @@ combine_stack_adjustments_for_block (bb)
last_sp_adjust += this_adjust;
free_csa_memlist (memlist);
memlist = NULL;
goto processed;
continue;
}
}
/* Combination failed. Restart processing from here. */
/* Combination failed. Restart processing from here. If
deallocation+allocation conspired to cancel, we can
delete the old deallocation insn. */
if (last_sp_set && last_sp_adjust == 0)
delete_insn (insn);
free_csa_memlist (memlist);
memlist = NULL;
last_sp_set = insn;
last_sp_adjust = this_adjust;
goto processed;
continue;
}
/* Find a predecrement of exactly the previous adjustment and
@ -2453,15 +2455,12 @@ combine_stack_adjustments_for_block (bb)
stack_pointer_rtx),
0))
{
if (last_sp_set == bb->head)
bb->head = NEXT_INSN (last_sp_set);
delete_insn (last_sp_set);
free_csa_memlist (memlist);
memlist = NULL;
last_sp_set = NULL_RTX;
last_sp_adjust = 0;
goto processed;
continue;
}
}
@ -2471,7 +2470,7 @@ combine_stack_adjustments_for_block (bb)
&& !for_each_rtx (&PATTERN (insn), record_stack_memrefs, &data))
{
memlist = data.memlist;
goto processed;
continue;
}
memlist = data.memlist;
@ -2481,20 +2480,15 @@ combine_stack_adjustments_for_block (bb)
&& (GET_CODE (insn) == CALL_INSN
|| reg_mentioned_p (stack_pointer_rtx, PATTERN (insn))))
{
if (last_sp_set && last_sp_adjust == 0)
delete_insn (last_sp_set);
free_csa_memlist (memlist);
memlist = NULL;
last_sp_set = NULL_RTX;
last_sp_adjust = 0;
}
processed:
if (insn == bb->end)
break;
if (pending_delete)
delete_insn (pending_delete);
}
if (pending_delete)
delete_insn (pending_delete);
if (last_sp_set && last_sp_adjust == 0)
delete_insn (last_sp_set);
}