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ifcvt.c (life_data_ok): New.

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* ifcvt.c (life_data_ok): New.
        (merge_if_block): Use it to determine whether to update
        global_live_at_end.
        (if_convert): Set it.

From-SVN: r43170
This commit is contained in:
Richard Henderson 2001-06-10 22:16:10 -07:00 • committed by Richard Henderson
parent 68fe6226c8
commit e16d045df7
2 changed files with 15 additions and 4 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2001-06-10 Richard Henderson <rth@redhat.com>
* ifcvt.c (life_data_ok): New.
(merge_if_block): Use it to determine whether to update
global_live_at_end.
(if_convert): Set it.
2001-06-10 Richard Henderson <rth@redhat.com>
* config/alpha/osf5.h (ASM_OLDAS_SPEC): Add -c.

12
gcc/ifcvt.c
View file

@ -66,6 +66,9 @@ static int num_updated_if_blocks;
/* # of basic blocks that were removed. */
static int num_removed_blocks;
/* True if life data ok at present. */
static bool life_data_ok;
/* The post-dominator relation on the original block numbers. */
static sbitmap *post_dominators;
@ -1719,7 +1722,7 @@ merge_if_block (test_bb, then_bb, else_bb, join_bb)
/* First merge TEST block into THEN block. This is a no-brainer since
the THEN block did not have a code label to begin with. */
if (combo_bb->global_live_at_end)
if (life_data_ok)
COPY_REG_SET (combo_bb->global_live_at_end, then_bb->global_live_at_end);
merge_blocks_nomove (combo_bb, then_bb);
num_removed_blocks++;
@ -1759,7 +1762,7 @@ merge_if_block (test_bb, then_bb, else_bb, join_bb)
else if (join_bb->pred == NULL || join_bb->pred->pred_next == NULL)
{
/* We can merge the JOIN. */
if (combo_bb->global_live_at_end)
if (life_data_ok)
COPY_REG_SET (combo_bb->global_live_at_end,
join_bb->global_live_at_end);
merge_blocks_nomove (combo_bb, join_bb);
@ -2444,14 +2447,15 @@ dead_or_predicable (test_bb, merge_bb, other_bb, new_dest, reversep)
/* Main entry point for all if-conversion. */
void
if_convert (life_data_ok)
int life_data_ok;
if_convert (x_life_data_ok)
int x_life_data_ok;
{
int block_num;
num_possible_if_blocks = 0;
num_updated_if_blocks = 0;
num_removed_blocks = 0;
life_data_ok = (x_life_data_ok != 0);
/* Free up basic_block_for_insn so that we don't have to keep it
up to date, either here or in merge_blocks_nomove. */