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gcse.c (bypass_last_basic_block): New global variable.

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* gcse.c (bypass_last_basic_block): New global variable.
	(bypass_block):  Use redirect_edge_and_branch_force to redirect
	fall-through edges.  Use bypass_last_basic_block to determine
	which blocks have valid PRE information.
	(bypass_conditional_jumps): Initialize bypass_last_basic_block.

From-SVN: r61800
This commit is contained in:
Roger Sayle 2003-01-25 21:49:52 +00:00 committed by Roger Sayle
parent 5f0bea72c5
commit 7821bfc741
2 changed files with 30 additions and 5 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2003-01-25 Roger Sayle <roger@eyesopen.com>
* gcse.c (bypass_last_basic_block): New global variable.
(bypass_block): Use redirect_edge_and_branch_force to redirect
fall-through edges. Use bypass_last_basic_block to determine
which blocks have valid PRE information.
(bypass_conditional_jumps): Initialize bypass_last_basic_block.
Sat Jan 25 22:31:59 CET 2003 Jan Hubicka <jh@suse.cz>
* gcse.c (local_cprop_pass): Update reg_sets table when needed.

27
gcc/gcse.c
View File

@ -4527,6 +4527,13 @@ one_cprop_pass (pass, cprop_jumps, bypass_jumps)
/* Bypass conditional jumps. */
/* The value of last_basic_block at the beginning of the jump_bypass
pass. The use of redirect_edge_and_branch_force may introduce new
basic blocks, but the data flow analysis is only valid for basic
block indices less than bypass_last_basic_block. */
static int bypass_last_basic_block;
/* Find a set of REGNO to a constant that is available at the end of basic
block BB. Returns NULL if no such set is found. Based heavily upon
find_avail_set. */
@ -4597,6 +4604,13 @@ bypass_block (bb, setcc, jump)
for (e = bb->pred; e; e = enext)
{
enext = e->pred_next;
if (e->flags & EDGE_COMPLEX)
continue;
/* We can't redirect edges from new basic blocks. */
if (e->src->index >= bypass_last_basic_block)
continue;
for (i = 0; i < reg_use_count; i++)
{
struct reg_use *reg_used = &reg_use_table[i];
@ -4630,12 +4644,13 @@ bypass_block (bb, setcc, jump)
else
dest = NULL;
/* Once basic block indices are stable, we should be able
to use redirect_edge_and_branch_force instead. */
old_dest = e->dest;
if (dest != NULL && dest != old_dest
&& redirect_edge_and_branch (e, dest))
{
if (dest != NULL
&& dest != old_dest
&& dest != EXIT_BLOCK_PTR)
{
redirect_edge_and_branch_force (e, dest);
/* Copy the register setter to the redirected edge.
Don't copy CC0 setters, as CC0 is dead after jump. */
if (setcc)
@ -4679,6 +4694,8 @@ bypass_conditional_jumps ()
if (ENTRY_BLOCK_PTR->next_bb == EXIT_BLOCK_PTR)
return 0;
bypass_last_basic_block = last_basic_block;
changed = 0;
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR->next_bb->next_bb,
EXIT_BLOCK_PTR, next_bb)