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backport: re PR tree-optimization/40168 (finding common subexpressions) 

2009-06-14  Richard Guenther  <rguenther@suse.de>

	Backport from mainline
	2009-05-18  Richard Guenther  <rguenther@suse.de>

	PR fortran/40168
	* trans-expr.c (gfc_trans_zero_assign): For local array
	destinations use an assignment from an empty constructor.

	* gfortran.dg/array_memset_2.f90: Adjust.

From-SVN: r148469
This commit is contained in:
Richard Guenther 2009-06-14 13:39:37 +00:00 committed by Richard Biener
parent 462ee08d96
commit 98b7f9857d
4 changed files with 27 additions and 7 deletions
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9
gcc/fortran/ChangeLog
View File

@ -1,3 +1,12 @@
2009-06-14 Richard Guenther <rguenther@suse.de>
Backport from mainline
2009-05-18 Richard Guenther <rguenther@suse.de>
PR fortran/40168
* trans-expr.c (gfc_trans_zero_assign): For local array
destinations use an assignment from an empty constructor.
2009-06-04 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/39893

11
gcc/fortran/trans-expr.c
View File

@ -4399,11 +4399,14 @@ gfc_trans_zero_assign (gfc_expr * expr)
len = fold_build2 (MULT_EXPR, gfc_array_index_type, len,
fold_convert (gfc_array_index_type, tmp));
/* Convert arguments to the correct types. */
/* If we are zeroing a local array avoid taking its address by emitting
a = {} instead. */
if (!POINTER_TYPE_P (TREE_TYPE (dest)))
dest = gfc_build_addr_expr (pvoid_type_node, dest);
else
dest = fold_convert (pvoid_type_node, dest);
return build2 (MODIFY_EXPR, void_type_node,
dest, build_constructor (TREE_TYPE (dest), NULL));
/* Convert arguments to the correct types. */
dest = fold_convert (pvoid_type_node, dest);
len = fold_convert (size_type_node, len);
/* Construct call to __builtin_memset. */

8
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,11 @@
2009-06-14 Richard Guenther <rguenther@suse.de>
Backport from mainline
2009-05-18 Richard Guenther <rguenther@suse.de>
PR fortran/40168
* gfortran.dg/array_memset_2.f90: Adjust.
2009-06-09 Jason Merrill <jason@redhat.com>
* g++.dg/cpp0x/defaulted10.C: New.

6
gcc/testsuite/gfortran.dg/array_memset_2.f90
View File

@ -20,8 +20,8 @@ program test
data c /2*1.0/
a(1,:) = 0. ! This can't be optimized to a memset.
b(1,:) = 0. ! This is optimized to memset.
c = 0. ! This is optimized to memset.
b(1,:) = 0. ! This is optimized to = {}.
c = 0. ! This is optimized to = {}.
d(:,1) = 0. ! This can't be otimized to a memset.
call bar(e)
@ -33,6 +33,6 @@ program test
end program
! { dg-final { scan-tree-dump-times "memset" 2 "original" } }
! { dg-final { scan-tree-dump-times "= {}" 2 "original" } }
! { dg-final { cleanup-tree-dump "original" } }
! { dg-final { cleanup-modules "foo" } }