Hello world,
the attached patch fixes a bug which was uncovered by the PR in
a matmul regression.
The problem is that bounds checking on the LHS with reallocation on
assignment makes no sense, and the original flag was not set for
the case in question.
I added both the original test and the reduced test to the single test
case.
OK for trunk?
Regards
Thomas
2018-06-08 Thomas Koenig <tkoe...@gcc.gnu.org>
PR fortran/85631
* trans.h (gfc_ss): Add field no_bounds_check.
* trans-array.c (gfc_conv_ss_startstride): If flag_realloc_lhs and
ss->no_bounds_check is set, do not use runtime checks.
* trans-expr.c (gfc_trans_assignment_1): Set lss->no_bounds_check
for reallocatable lhs.
2018-06-08 Thomas Koenig <tkoe...@gcc.gnu.org>
PR fortran/85631
* gfortran.dg/bounds_check_20.f90: New test.
Index: trans-array.c
===================================================================
--- trans-array.c (Revision 261245)
+++ trans-array.c (Arbeitskopie)
@@ -4304,7 +4304,7 @@ done:
}
}
- /* The rest is just runtime bound checking. */
+ /* The rest is just runtime bounds checking. */
if (gfc_option.rtcheck & GFC_RTCHECK_BOUNDS)
{
stmtblock_t block;
@@ -4334,7 +4334,7 @@ done:
continue;
/* Catch allocatable lhs in f2003. */
- if (flag_realloc_lhs && ss->is_alloc_lhs)
+ if (flag_realloc_lhs && ss->no_bounds_check)
continue;
expr = ss_info->expr;
Index: trans-expr.c
===================================================================
--- trans-expr.c (Revision 261245)
+++ trans-expr.c (Arbeitskopie)
@@ -9982,12 +9982,15 @@ gfc_trans_assignment_1 (gfc_expr * expr1, gfc_expr
/* Walk the lhs. */
lss = gfc_walk_expr (expr1);
- if (gfc_is_reallocatable_lhs (expr1)
- && !(expr2->expr_type == EXPR_FUNCTION
- && expr2->value.function.isym != NULL
- && !(expr2->value.function.isym->elemental
- || expr2->value.function.isym->conversion)))
- lss->is_alloc_lhs = 1;
+ if (gfc_is_reallocatable_lhs (expr1))
+ {
+ lss->no_bounds_check = 1;
+ if (!(expr2->expr_type == EXPR_FUNCTION
+ && expr2->value.function.isym != NULL
+ && !(expr2->value.function.isym->elemental
+ || expr2->value.function.isym->conversion)))
+ lss->is_alloc_lhs = 1;
+ }
rss = NULL;
Index: trans.h
===================================================================
--- trans.h (Revision 261245)
+++ trans.h (Arbeitskopie)
@@ -330,6 +330,7 @@ typedef struct gfc_ss
struct gfc_loopinfo *loop;
unsigned is_alloc_lhs:1;
+ unsigned no_bounds_check:1;
}
gfc_ss;
#define gfc_get_ss() XCNEW (gfc_ss)
! { dg-do run }
! { dg-additional-options "-fcheck=bounds -ffrontend-optimize" }
! PR 85631 - this used to cause a runtime error with bounds checking.
module x
contains
subroutine sub(a, b)
real, dimension(:,:), intent(in) :: a
real, dimension(:,:), intent(out), allocatable :: b
b = transpose(a)
end subroutine sub
end module x
program main
use x
implicit none
real, dimension(2,2) :: a
real, dimension(:,:), allocatable :: b
data a /-2., 3., -5., 7./
call sub(a, b)
if (any (b /= reshape([-2., -5., 3., 7.], shape(b)))) stop 1
b = matmul(transpose(b), a)
if (any (b /= reshape([-11., 15., -25., 34.], shape(b)))) stop 2
end program
