* [C++ PATCH] Fix ICE due to Cilk+ related cp_gimplify_expr bug (PR objc++/68511, PR c++/69213)
@ 2016-01-11 17:24 Jakub Jelinek
2016-01-12 13:32 ` Jason Merrill
0 siblings, 1 reply; 2+ messages in thread
From: Jakub Jelinek @ 2016-01-11 17:24 UTC (permalink / raw)
To: Jason Merrill; +Cc: gcc-patches
Hi!
If errors are reported in unrelated functions, then due to recent
Cilk+ related change in cp_gimplify_expr basically all gimplification
results in almost no statements to be added to the IL, while returning
SSA_NAMEs set by the missing code, because for INIT_EXPRs cp_gimplify_expr
would just return GS_ERROR if seen_error () instead of actually doing
anything.
Igor has posted a fix for this a month ago:
https://gcc.gnu.org/ml/gcc-patches/2015-12/msg00651.html
but that fix still looks wrong to me, it seems it will just limit
the problems to functions that originally contained at least one
_Cilk_spawn.
The fix limits the GS_ERROR to a) functions that contain _Cilk_spawn
b) if cilk_detect_spawn_and_unwrap fails (that can be for two reasons,
that _Cilk_spawn is not present at all, or if it is present, but used
in incorrect place) c) if _Cilk_spawn is present in the expression.
As cilk_detect_spawn_and_unwrap will already report error if it is present,
but in incorrect place, the c) test is guarded with seen_error (), so there
is no additional compile time cost in correct programs (or functions not
containing _Cilk_spawn at all).
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2016-01-11 Jakub Jelinek <jakub@redhat.com>
PR objc++/68511
PR c++/69213
* cp-gimplify.c (cp_gimplify_expr) <case INIT_EXPR>: Don't return
GS_ERROR whenever seen_error (), only if *expr_p contains
cilk spawn stmt, but cilk_detect_spawn_and_unwrap failed.
* g++.dg/opt/pr69213.C: New test.
--- gcc/cp/cp-gimplify.c.jj 2016-01-04 14:55:57.000000000 +0100
+++ gcc/cp/cp-gimplify.c 2016-01-11 13:22:36.475552358 +0100
@@ -617,14 +617,17 @@ cp_gimplify_expr (tree *expr_p, gimple_s
LHS of an assignment might also be involved in the RHS, as in bug
25979. */
case INIT_EXPR:
- if (fn_contains_cilk_spawn_p (cfun)
- && cilk_detect_spawn_and_unwrap (expr_p))
+ if (fn_contains_cilk_spawn_p (cfun))
{
- cilk_cp_gimplify_call_params_in_spawned_fn (expr_p, pre_p, post_p);
- return (enum gimplify_status) gimplify_cilk_spawn (expr_p);
+ if (cilk_detect_spawn_and_unwrap (expr_p))
+ {
+ cilk_cp_gimplify_call_params_in_spawned_fn (expr_p,
+ pre_p, post_p);
+ return (enum gimplify_status) gimplify_cilk_spawn (expr_p);
+ }
+ if (seen_error () && contains_cilk_spawn_stmt (*expr_p))
+ return GS_ERROR;
}
- if (seen_error ())
- return GS_ERROR;
cp_gimplify_init_expr (expr_p);
if (TREE_CODE (*expr_p) != INIT_EXPR)
--- gcc/testsuite/g++.dg/opt/pr69213.C.jj 2016-01-11 13:18:05.949292994 +0100
+++ gcc/testsuite/g++.dg/opt/pr69213.C 2016-01-11 13:18:53.276638586 +0100
@@ -0,0 +1,18 @@
+// PR c++/69213
+// { dg-do compile }
+// { dg-options "-O3" }
+
+int a, b;
+
+void
+foo (void)
+{
+ __asm__ ("# %0" : : : "memory"); // { dg-error "operand number out of range" }
+}
+
+int
+main ()
+{
+ for (; a < 0; b++)
+ a = b;
+}
Jakub
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [C++ PATCH] Fix ICE due to Cilk+ related cp_gimplify_expr bug (PR objc++/68511, PR c++/69213)
2016-01-11 17:24 [C++ PATCH] Fix ICE due to Cilk+ related cp_gimplify_expr bug (PR objc++/68511, PR c++/69213) Jakub Jelinek
@ 2016-01-12 13:32 ` Jason Merrill
0 siblings, 0 replies; 2+ messages in thread
From: Jason Merrill @ 2016-01-12 13:32 UTC (permalink / raw)
To: Jakub Jelinek; +Cc: gcc-patches
OK.
Jason
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-01-11 17:24 [C++ PATCH] Fix ICE due to Cilk+ related cp_gimplify_expr bug (PR objc++/68511, PR c++/69213) Jakub Jelinek
2016-01-12 13:32 ` Jason Merrill
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