Hi!
As the testcase shows, the sel-sched.c framework can't deal with debugging
insns without causing -fcompare-debug failures, and I presume also with
debug markers, with which it causes even ICEs right now.
The following patch just follows what we do for -fvar-tracking-assignments,
disable it by default if -fselective-scheduling*. It isn't a complete fix,
the testcase will still ICE with explicit -fselective-scheduling{,2}
-gstatement-frontiers, but at least it won't ICE that often and even if the
ICE is fixed, it is quite unlikely that debug marker handling would
work with -fcompare-debug when other debug insns don't work with that.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2018-01-05 Jakub Jelinek <ja...@redhat.com>
PR debug/83480
* toplev.c (process_options): Don't enable debug_nonbind_markers_p
by default if flag_selective_schedling{,2}. Formatting fixes.
* gcc.dg/pr83480.c: New test.
--- gcc/toplev.c.jj 2018-01-03 10:19:54.453533845 +0100
+++ gcc/toplev.c 2018-01-05 16:20:56.130195110 +0100
@@ -1535,8 +1535,9 @@ process_options (void)
flag_var_tracking_uninit = flag_var_tracking;
if (flag_var_tracking_assignments == AUTODETECT_VALUE)
- flag_var_tracking_assignments = flag_var_tracking
- && !(flag_selective_scheduling || flag_selective_scheduling2);
+ flag_var_tracking_assignments
+ = (flag_var_tracking
+ && !(flag_selective_scheduling || flag_selective_scheduling2));
if (flag_var_tracking_assignments_toggle)
flag_var_tracking_assignments = !flag_var_tracking_assignments;
@@ -1550,8 +1551,12 @@ process_options (void)
"var-tracking-assignments changes selective scheduling");
if (debug_nonbind_markers_p == AUTODETECT_VALUE)
- debug_nonbind_markers_p = optimize && debug_info_level >=
DINFO_LEVEL_NORMAL
- && (write_symbols == DWARF2_DEBUG || write_symbols ==
VMS_AND_DWARF2_DEBUG);
+ debug_nonbind_markers_p
+ = (optimize
+ && debug_info_level >= DINFO_LEVEL_NORMAL
+ && (write_symbols == DWARF2_DEBUG
+ || write_symbols == VMS_AND_DWARF2_DEBUG)
+ && !(flag_selective_scheduling || flag_selective_scheduling2));
if (flag_tree_cselim == AUTODETECT_VALUE)
{
--- gcc/testsuite/gcc.dg/pr83480.c.jj 2018-01-05 16:24:14.444290629 +0100
+++ gcc/testsuite/gcc.dg/pr83480.c 2018-01-05 16:23:40.631274338 +0100
@@ -0,0 +1,32 @@
+/* PR debug/83480 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -g -fselective-scheduling2 -ftree-vectorize
-freorder-blocks-algorithm=simple -fnon-call-exceptions
-fno-guess-branch-probability -fno-peephole2 -fno-tree-sink
-fno-tree-scev-cprop" } */
+
+signed char a, b;
+
+void
+foo (int x, int y)
+{
+ for (a = 1; a != 0; ++a)
+ ;
+
+ for (;;)
+ {
+ int c;
+
+ b %= (y != 0 && a != 0) + 1;
+ if (a != 0)
+ y = b;
+
+ for (c = 0; c < 50; ++c)
+ ++x;
+
+ if (a < 1)
+ {
+ while (x != 0)
+ ;
+
+ a /= 0; /* { dg-warning "division by zero" } */
+ }
+ }
+}
Jakub
