+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.
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;