OpenE2K
/
gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

re PR middle-end/44203 (New prefetch test failures) 

2010-05-25  Christian Borntraeger  <borntraeger@de.ibm.com>

	PR 44203
	* tree-ssa-loop-prefetch.c: Fix logic for step calculation to
	match the original (and intended) behaviour before r159557.  This
	changeset changed a=a+b*c to a=(a+b)*b which was obviously wrong
	in two ways.

From-SVN: r159816
This commit is contained in:
Christian Borntraeger 2010-05-25 11:18:07 +00:00 committed by Andreas Krebbel
parent be6d3f0e89
commit 8fde8b401d
2 changed files with 17 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2010-05-25 Christian Borntraeger <borntraeger@de.ibm.com>
PR 44203
* tree-ssa-loop-prefetch.c: Fix logic for step calculation to
match the original (and intended) behaviour before r159557. This
changeset changed a=a+b*c to a=(a+b)*b which was obviously wrong
in two ways.
2010-05-25 Richard Guenther <rguenther@suse.de>
* doc/invoke.texi: Document -Ofast.

19
gcc/tree-ssa-loop-prefetch.c
View File

@ -423,25 +423,24 @@ idx_analyze_ref (tree base, tree *index, void *data)
ibase = build_int_cst (TREE_TYPE (ibase), 0);
}
if (*ar_data->step == NULL_TREE)
*ar_data->step = step;
else
*ar_data->step = fold_build2 (PLUS_EXPR, sizetype,
fold_convert (sizetype, *ar_data->step),
fold_convert (sizetype, step));
if (TREE_CODE (base) == ARRAY_REF)
{
stepsize = array_ref_element_size (base);
if (!cst_and_fits_in_hwi (stepsize))
return false;
imult = int_cst_value (stepsize);
*ar_data->step = fold_build2 (MULT_EXPR, sizetype,
fold_convert (sizetype, *ar_data->step),
fold_convert (sizetype, step));
step = fold_build2 (MULT_EXPR, sizetype,
fold_convert (sizetype, step),
fold_convert (sizetype, stepsize));
idelta *= imult;
}
if (*ar_data->step == NULL_TREE)
*ar_data->step = step;
else
*ar_data->step = fold_build2 (PLUS_EXPR, sizetype,
fold_convert (sizetype, *ar_data->step),
fold_convert (sizetype, step));
*ar_data->delta += idelta;
*index = ibase;