On Tue, Jun 07, 2011 at 12:24:06PM +0200, Richard Guenther wrote:
> Probably easier and more complete to do
>
> if (lhs && TREE_CODE (lhs) != SSA_NAME)
> {
> tree base = get_base_address (lhs);
Done in the patch below, bootstrapped/regtested again on x86_64-linux and
i686-linux on the 4.6 branch.
> I don't like the patch too much, but it looks reasonable. At least reverting
> your patch doesn't really fix anything.
>
> Any opinions from others?
Michael said the same, anyone else has any opinion or can I check it in for
4.6?
2011-06-13 Jakub Jelinek <ja...@redhat.com>
PR fortran/49103
* tree.h (DECL_NONSHAREABLE): Define.
(struct tree_decl_common): Change decl_common_unused to
decl_nonshareable_flag.
* cfgexpand.c (expand_used_vars_for_block, clear_tree_used):
Ignore vars with DECL_NONSHAREABLE bit set.
* tree-cfg.c (gimple_duplicate_bb): Set DECL_NONSHAREABLE
on stores to automatic aggregate vars.
* gfortran.dg/pr49103.f90: New test.
--- gcc/tree.h.jj 2011-03-14 14:12:15.000000000 +0100
+++ gcc/tree.h 2011-05-31 14:05:34.000000000 +0200
@@ -1330,6 +1330,10 @@ extern void omp_clause_range_check_faile
#define DECL_READ_P(NODE) \
(TREE_CHECK2 (NODE, VAR_DECL, PARM_DECL)->decl_common.decl_read_flag)
+#define DECL_NONSHAREABLE(NODE) \
+ (TREE_CHECK2 (NODE, VAR_DECL, \
+ RESULT_DECL)->decl_common.decl_nonshareable_flag)
+
/* In a CALL_EXPR, means that the call is the jump from a thunk to the
thunked-to function. */
#define CALL_FROM_THUNK_P(NODE) (CALL_EXPR_CHECK (NODE)->base.protected_flag)
@@ -2787,8 +2791,9 @@ struct GTY(()) tree_decl_common {
being set. */
unsigned decl_read_flag : 1;
- /* Padding so that 'off_align' can be on a 32-bit boundary. */
- unsigned decl_common_unused : 1;
+ /* In VAR_DECL or RESULT_DECL set when significant code movement precludes
+ attempting to share the stack slot with some other variable. */
+ unsigned decl_nonshareable_flag : 1;
/* DECL_OFFSET_ALIGN, used only for FIELD_DECLs. */
unsigned int off_align : 8;
--- gcc/cfgexpand.c.jj 2011-05-04 10:46:52.000000000 +0200
+++ gcc/cfgexpand.c 2011-05-31 14:08:36.000000000 +0200
@@ -1134,7 +1134,9 @@ expand_used_vars_for_block (tree block,
/* Expand all variables at this level. */
for (t = BLOCK_VARS (block); t ; t = DECL_CHAIN (t))
- if (TREE_USED (t))
+ if (TREE_USED (t)
+ && ((TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != RESULT_DECL)
+ || !DECL_NONSHAREABLE (t)))
expand_one_var (t, toplevel, true);
this_sv_num = stack_vars_num;
@@ -1167,6 +1169,8 @@ clear_tree_used (tree block)
for (t = BLOCK_VARS (block); t ; t = DECL_CHAIN (t))
/* if (!TREE_STATIC (t) && !DECL_EXTERNAL (t)) */
+ if ((TREE_CODE (t) != VAR_DECL && TREE_CODE (t) != RESULT_DECL)
+ || !DECL_NONSHAREABLE (t))
TREE_USED (t) = 0;
for (t = BLOCK_SUBBLOCKS (block); t ; t = BLOCK_CHAIN (t))
--- gcc/tree-cfg.c.jj 2011-03-14 14:12:15.000000000 +0100
+++ gcc/tree-cfg.c 2011-06-13 19:34:18.000000000 +0200
@@ -5117,6 +5117,7 @@ gimple_duplicate_bb (basic_block bb)
{
def_operand_p def_p;
ssa_op_iter op_iter;
+ tree lhs;
stmt = gsi_stmt (gsi);
if (gimple_code (stmt) == GIMPLE_LABEL)
@@ -5130,6 +5131,24 @@ gimple_duplicate_bb (basic_block bb)
maybe_duplicate_eh_stmt (copy, stmt);
gimple_duplicate_stmt_histograms (cfun, copy, cfun, stmt);
+ /* When copying around a stmt writing into a local non-user
+ aggregate, make sure it won't share stack slot with other
+ vars. */
+ lhs = gimple_get_lhs (stmt);
+ if (lhs && TREE_CODE (lhs) != SSA_NAME)
+ {
+ tree base = get_base_address (lhs);
+ if (base
+ && (TREE_CODE (base) == VAR_DECL
+ || TREE_CODE (base) == RESULT_DECL)
+ && DECL_IGNORED_P (base)
+ && !TREE_STATIC (base)
+ && !DECL_EXTERNAL (base)
+ && (TREE_CODE (base) != VAR_DECL
+ || !DECL_HAS_VALUE_EXPR_P (base)))
+ DECL_NONSHAREABLE (base) = 1;
+ }
+
/* Create new names for all the definitions created by COPY and
add replacement mappings for each new name. */
FOR_EACH_SSA_DEF_OPERAND (def_p, copy, op_iter, SSA_OP_ALL_DEFS)
--- gcc/testsuite/gfortran.dg/pr49103.f90.jj 2011-05-31 13:52:43.000000000
+0200
+++ gcc/testsuite/gfortran.dg/pr49103.f90 2011-05-31 13:57:16.000000000
+0200
@@ -0,0 +1,19 @@
+! PR fortran/49103
+! { dg-do run }
+ integer :: a(2), b(2), i, j
+ open (10, status='scratch')
+ do j = 1, 2
+ a = (/ 0, 0 /)
+ b = (/ 1, 1 /)
+ do i = 1, 2
+ write (10, *) a
+ write (10, *) b
+ end do
+ end do
+ rewind (10)
+ do i = 0, 7
+ read (10, *) a
+ if (any (a .ne. mod (i, 2))) call abort
+ end do
+ close (10)
+end
Jakub
