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re PR rtl-optimization/40956 (Constants are never candidates for hoisting)

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PR rtl-optimization/40956
	PR target/42495
	PR middle-end/42574
	* gcse.c (compute_code_hoist_vbeinout): Consider more expressions
	for hoisting.
	(hoist_code): Count occurences in current block too.

From-SVN: r162590
This commit is contained in:
Maxim Kuvyrkov 2010-07-27 19:34:55 +00:00 committed by Maxim Kuvyrkov
parent 2016034718
commit ce4c0015a1
2 changed files with 23 additions and 2 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2010-07-27 Maxim Kuvyrkov <maxim@codesourcery.com>
PR rtl-optimization/40956
PR target/42495
PR middle-end/42574
* gcse.c (compute_code_hoist_vbeinout): Consider more expressions
for hoisting.
(hoist_code): Count occurences in current block too.
2010-07-27 Maxim Kuvyrkov <maxim@codesourcery.com>
* gcse.c (struct expr:max_distance): New field.

16
gcc/gcse.c
View File

@ -4247,8 +4247,15 @@ compute_code_hoist_vbeinout (void)
FOR_EACH_BB_REVERSE (bb)
{
if (bb->next_bb != EXIT_BLOCK_PTR)
sbitmap_intersection_of_succs (hoist_vbeout[bb->index],
hoist_vbein, bb->index);
{
sbitmap_intersection_of_succs (hoist_vbeout[bb->index],
hoist_vbein, bb->index);
/* Include expressions in VBEout that are calculated
in BB and available at its end. */
sbitmap_a_or_b (hoist_vbeout[bb->index],
hoist_vbeout[bb->index], comp[bb->index]);
}
changed |= sbitmap_a_or_b_and_c_cg (hoist_vbein[bb->index],
antloc[bb->index],
@ -4430,6 +4437,11 @@ hoist_code (void)
if (TEST_BIT (hoist_vbeout[bb->index], i))
{
/* If an expression is computed in BB and is available at end of
BB, hoist all occurences dominated by BB to BB. */
if (TEST_BIT (comp[bb->index], i))
hoistable++;
/* We've found a potentially hoistable expression, now
we look at every block BB dominates to see if it
computes the expression. */