https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87266
Bug ID: 87266
Summary: [9 Regression] ICE: Segmentation fault (in
useless_type_conversion_p, tree_nop_conversion_p, or
is_gimple_reg_type)
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
gcc-9.0.0-alpha20180909 snapshot (r264185; actually, gcc-9.0.0-alpha20180902,
r264045) ICEs when compiling the following snippet w/ -O2 (-O3, -Ofast, -Os)
-fno-tree-ccp -fno-tree-forwprop:
1.
void
iw (int gu, int mq, int r2)
{
int yn = 0;
while (gu < 1)
{
for (;;)
;
bb:;
int ay = 0;
while (ay < 1)
++mq;
}
if (yn != 0)
goto up;
if (0)
{
up:
if (r2 == 0)
goto bb;
}
goto up;
}
% gcc-9.0.0-alpha20180909 -O2 -fno-tree-ccp -fno-tree-forwprop -c nuni7epw.c
during GIMPLE pass: fre
nuni7epw.c: In function 'iw':
nuni7epw.c:29:1: internal compiler error: Segmentation fault
29 | }
| ^
0xcb76df crash_signal
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/toplev.c:325
0xa197c0 useless_type_conversion_p(tree_node*, tree_node*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/gimple-expr.c:70
0xe4065f may_propagate_copy(tree_node*, tree_node*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-ssa-propagate.c:1260
0xcf78fc gimple_merge_blocks
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfg.c:2070
0x89ab0f merge_blocks(basic_block_def*, basic_block_def*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/cfghooks.c:793
0xd05061 cleanup_tree_cfg_bb
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:719
0xd063e8 cleanup_tree_cfg_noloop
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:905
0xd063e8 cleanup_tree_cfg()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:989
0xbd71ec execute_function_todo
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/passes.c:1896
0xbd804e execute_todo
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/passes.c:1997
2.
--- nuni7epw.c.jj 2018-09-10 10:54:29.671619781 +0700
+++ nuni7epw.c 2018-09-10 10:54:37.730536962 +0700
@@ -11,7 +11,7 @@ iw (int gu, int mq, int r2)
bb:;
int ay = 0;
- while (ay < 1)
+ while (yn < 1)
++mq;
}
% gcc-9.0.0-alpha20180909 -O2 -fno-tree-ccp -fno-tree-forwprop -c nuni7epw.c
during GIMPLE pass: fre
nuni7epw.c: In function 'iw':
nuni7epw.c:29:1: internal compiler error: Segmentation fault
29 | }
| ^
0xcb76df crash_signal
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/toplev.c:325
0xf482d9 tree_nop_conversion_p(tree_node const*, tree_node const*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree.c:12184
0x10c3c18 gimple_simplify_166
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/build/gcc/gimple-match.c:8176
0x10d323d gimple_simplify_LE_EXPR
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/build/gcc/gimple-match.c:71030
0x10308d2 gimple_simplify
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/build/gcc/gimple-match.c:86180
0x103276f gimple_resimplify2(gimple**, gimple_match_op*, tree_node*
(*)(tree_node*))
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/gimple-match-head.c:285
0x113bfb5 gimple_simplify(gimple*, gimple_match_op*, gimple**, tree_node*
(*)(tree_node*), tree_node* (*)(tree_node*))
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/gimple-match-head.c:1012
0xd0587d cleanup_control_expr_graph
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:149
0xd0587d cleanup_control_flow_bb
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:247
0xd05ff1 cleanup_control_flow_pre
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:757
0xd06379 cleanup_tree_cfg_noloop
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:881
0xd06379 cleanup_tree_cfg()
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfgcleanup.c:989
0xbd71ec execute_function_todo
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/passes.c:1896
0xbd804e execute_todo
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/passes.c:1997
3.
--- nuni7epw.c.jj 2018-09-10 10:54:29.671619781 +0700
+++ nuni7epw.c 2018-09-10 10:56:44.197236464 +0700
@@ -5,12 +5,12 @@ iw (int gu, int mq, int r2)
while (gu < 1)
{
+ int ay = 0;
+
for (;;)
;
- bb:;
- int ay = 0;
-
+ bb:
while (ay < 1)
++mq;
}
% gcc-9.0.0-alpha20180909 -O2 -fno-tree-ccp -fno-tree-forwprop -c nuni7epw.c
during GIMPLE pass: fre
nuni7epw.c: In function 'iw':
nuni7epw.c:29:1: internal compiler error: Segmentation fault
29 | }
| ^
0xcb76df crash_signal
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/toplev.c:325
0xa1ac91 is_gimple_reg_type
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/gimple-expr.h:75
0xa1ac91 is_gimple_val(tree_node*)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/gimple-expr.c:789
0xcff40a verify_gimple_phi
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfg.c:4975
0xcff40a verify_gimple_in_cfg(function*, bool)
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/tree-cfg.c:5303
0xbd715f execute_function_todo
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/passes.c:1943
0xbd804e execute_todo
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180909/work/gcc-9-20180909/gcc/passes.c:1997
