On Thu, Oct 06, 2022 at 12:55:01PM +0200, Tobias Burnus wrote:
> Same as for C/C++, albeit a tiny bit longer patch.
>
> I don't know whether it makes sense to handle – in the long run – the
> case of se.pre/se.post being nonempty – and, if so, how.
I think it is essential not to throw those away,
if se.pre or se.post, you can e.g. expand it roughly as C/C++ ({ cond; }),
in GENERIC it can be say a TARGET_EXPR with a boolean
temporary as slot, where the the initializer will be the
se.pre part, followed by MODIFY_EXPR which sets the slot to se.expr
value and followed by se.post.
I've only started playing with the middle-end changes now, here
is what I have and plan to at lower_cf time turn that into essentially
bool artificial (args...)
{
return cond;
}
and
.ASSUME (&artificial, args...);
--- gcc/gimplify.cc.jj 2022-10-06 08:56:28.344131629 +0200
+++ gcc/gimplify.cc 2022-10-06 14:04:46.647204910 +0200
@@ -3569,7 +3569,45 @@ gimplify_call_expr (tree *expr_p, gimple
fndecl, 0));
return GS_OK;
}
- /* FIXME: Otherwise expand it specially. */
+ /* Temporarily, until gimple lowering, transform
+ .ASSUME (cond);
+ into:
+ guard = .ASSUME ();
+ if (guard) goto label_true; else label_false;
+ label_true:;
+ {
+ guard = cond;
+ }
+ label_false:;
+ .ASSUME (guard);
+ such that gimple lowering can outline the condition into
+ a separate function easily. */
+ tree guard = create_tmp_var (boolean_type_node);
+ gcall *call = gimple_build_call_internal (ifn, 0);
+ gimple_call_set_nothrow (call, TREE_NOTHROW (*expr_p));
+ gimple_set_location (call, loc);
+ gimple_call_set_lhs (call, guard);
+ gimple_seq_add_stmt (pre_p, call);
+ *expr_p = build2 (MODIFY_EXPR, void_type_node, guard,
+ CALL_EXPR_ARG (*expr_p, 0));
+ *expr_p = build3 (BIND_EXPR, void_type_node, NULL, *expr_p, NULL);
+ tree label_false = create_artificial_label (UNKNOWN_LOCATION);
+ tree label_true = create_artificial_label (UNKNOWN_LOCATION);
+ gcond *cond_stmt = gimple_build_cond (NE_EXPR, guard,
+ boolean_false_node,
+ label_true, label_false);
+ gimplify_seq_add_stmt (pre_p, cond_stmt);
+ gimplify_seq_add_stmt (pre_p, gimple_build_label (label_true));
+ push_gimplify_context ();
+ gimple_seq body = NULL;
+ gimple *g = gimplify_and_return_first (*expr_p, &body);
+ pop_gimplify_context (g);
+ gimplify_seq_add_seq (pre_p, body);
+ gimplify_seq_add_stmt (pre_p, gimple_build_label (label_false));
+ call = gimple_build_call_internal (ifn, 1, guard);
+ gimple_call_set_nothrow (call, TREE_NOTHROW (*expr_p));
+ gimple_set_location (call, loc);
+ gimple_seq_add_stmt (pre_p, call);
return GS_ALL_DONE;
}
--- gcc/cp/pt.cc.jj 2022-10-06 08:56:28.670127213 +0200
+++ gcc/cp/pt.cc 2022-10-06 13:42:26.632351930 +0200
@@ -21182,6 +21182,8 @@ tsubst_copy_and_build (tree t,
ret = error_mark_node;
break;
}
+ if (!processing_template_decl)
+ arg = fold_build_cleanup_point_expr (TREE_TYPE (arg), arg);
ret = build_call_expr_internal_loc (EXPR_LOCATION (t),
IFN_ASSUME,
void_type_node, 1,
--- gcc/cp/cp-gimplify.cc.jj 2022-10-06 08:56:28.660127349 +0200
+++ gcc/cp/cp-gimplify.cc 2022-10-06 13:41:54.286789968 +0200
@@ -3117,6 +3117,8 @@ process_stmt_assume_attribute (tree std_
arg = contextual_conv_bool (arg, tf_warning_or_error);
if (error_operand_p (arg))
continue;
+ if (!processing_template_decl)
+ arg = fold_build_cleanup_point_expr (TREE_TYPE (arg), arg);
statement = build_call_expr_internal_loc (attrs_loc, IFN_ASSUME,
void_type_node, 1, arg);
finish_expr_stmt (statement);
--- gcc/cp/parser.cc.jj 2022-10-06 10:39:31.989345921 +0200
+++ gcc/cp/parser.cc 2022-10-06 13:41:28.001145938 +0200
@@ -46029,6 +46029,8 @@ cp_parser_omp_assumption_clauses (cp_par
t = contextual_conv_bool (t, tf_warning_or_error);
if (is_assume && !error_operand_p (t))
{
+ if (!processing_template_decl)
+ t = fold_build_cleanup_point_expr (TREE_TYPE (t), t);
t = build_call_expr_internal_loc (eloc, IFN_ASSUME,
void_type_node, 1, t);
finish_expr_stmt (t);
Jakub
