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tree-cfg.c (replace_uses_by): Only mark blocks altered that will make a difference. 

2011-12-14  Richard Guenther  <rguenther@suse.de>

	* tree-cfg.c (replace_uses_by): Only mark blocks altered
	that will make a difference.  Only recompute ADDR_EXPR
	invariantness if it could possibly have changed.  Do so
	before folding the statement.

From-SVN: r182327
This commit is contained in:
Richard Guenther 2011-12-14 09:50:38 +00:00 committed by Richard Biener
parent 4f9c574a92
commit 552d2db565
2 changed files with 30 additions and 14 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2011-12-14 Richard Guenther <rguenther@suse.de>
* tree-cfg.c (replace_uses_by): Only mark blocks altered
that will make a difference. Only recompute ADDR_EXPR
invariantness if it could possibly have changed. Do so
before folding the statement.
2011-12-13 Eric Botcazou <ebotcazou@adacore.com>
* lto-streamer-out.c (write_symbol): Use proper 64-bit host type.

37
gcc/tree-cfg.c
View File

@ -1592,7 +1592,7 @@ replace_uses_by (tree name, tree val)
/* This can only occur for virtual operands, since
for the real ones SSA_NAME_OCCURS_IN_ABNORMAL_PHI (name))
would prevent replacement. */
gcc_assert (!is_gimple_reg (name));
gcc_checking_assert (!is_gimple_reg (name));
SSA_NAME_OCCURS_IN_ABNORMAL_PHI (val) = 1;
}
}
@ -1604,28 +1604,37 @@ replace_uses_by (tree name, tree val)
gimple orig_stmt = stmt;
size_t i;
fold_stmt (&gsi);
stmt = gsi_stmt (gsi);
if (cfgcleanup_altered_bbs && !is_gimple_debug (stmt))
/* Mark the block if we changed the last stmt in it. */
if (cfgcleanup_altered_bbs
&& stmt_ends_bb_p (stmt))
bitmap_set_bit (cfgcleanup_altered_bbs, gimple_bb (stmt)->index);
/* FIXME. This should go in update_stmt. */
for (i = 0; i < gimple_num_ops (stmt); i++)
/* FIXME. It shouldn't be required to keep TREE_CONSTANT
on ADDR_EXPRs up-to-date on GIMPLE. Propagation will
only change sth from non-invariant to invariant, and only
when propagating integer constants. */
if (TREE_CODE (val) == INTEGER_CST)
for (i = 0; i < gimple_num_ops (stmt); i++)
{
tree op = gimple_op (stmt, i);
/* Operands may be empty here. For example, the labels
of a GIMPLE_COND are nulled out following the creation
of the corresponding CFG edges. */
if (op && TREE_CODE (op) == ADDR_EXPR)
recompute_tree_invariant_for_addr_expr (op);
}
if (fold_stmt (&gsi))
{
tree op = gimple_op (stmt, i);
/* Operands may be empty here. For example, the labels
of a GIMPLE_COND are nulled out following the creation
of the corresponding CFG edges. */
if (op && TREE_CODE (op) == ADDR_EXPR)
recompute_tree_invariant_for_addr_expr (op);
stmt = gsi_stmt (gsi);
maybe_clean_or_replace_eh_stmt (orig_stmt, stmt);
}
maybe_clean_or_replace_eh_stmt (orig_stmt, stmt);
update_stmt (stmt);
}
}
gcc_assert (has_zero_uses (name));
gcc_checking_assert (has_zero_uses (name));
/* Also update the trees stored in loop structures. */
if (current_loops)