https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68459
Bug ID: 68459
Summary: ICE when compiling for alpha with -O3
Product: gcc
Version: 5.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: dhowells at redhat dot com
Target Milestone: ---
Created attachment 36782
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36782&action=edit
Reduced test case
When compiling the attached test case for alpha-linux-gnu with -O3, the
compiler segfaults and produces the following:
alpha-linux-gnu-gcc -c -O3 /tmp/bz1265791-testcase.c
/tmp/bz1265791-testcase.c: In function ‘synchronize_rcu_tasks’:
/tmp/bz1265791-testcase.c:8:6: internal compiler error: Segmentation fault
void synchronize_rcu_tasks(void)
^
/usr/libexec/gcc/alpha-linux-gnu/5.2.1/cc1 -quiet -v /tmp/bz1265791-testcase.c
-quiet -dumpbase bz1265791-testcase.c -auxbase bz1265791-testcase -O3 -version
-o /tmp/ccf0UqVc.s
I caught it in gdb:
Program received signal SIGSEGV, Segmentation fault.
fold_builtin_alloca_with_align (stmt=0x7ffff19436c0)
at ../../gcc-5.2.1-20150716/gcc/tree-ssa-ccp.c:2067
2067 && TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL))
and I got the following backtrace:
#0 fold_builtin_alloca_with_align (stmt=0x7ffff19436c0)
at ../../gcc-5.2.1-20150716/gcc/tree-ssa-ccp.c:2067
#1 ccp_fold_stmt (gsi=0x7fffffffd8a0)
at ../../gcc-5.2.1-20150716/gcc/tree-ssa-ccp.c:2172
#2 0x0000000000a07c17 in substitute_and_fold_dom_walker::before_dom_children (
this=0x7fffffffd960, bb=0x7ffff191faf8)
at ../../gcc-5.2.1-20150716/gcc/tree-ssa-propagate.c:1177
#3 0x0000000000b8dfe8 in dom_walker::walk (this=0x7fffffffd960,
bb=0x7ffff191faf8) at ../../gcc-5.2.1-20150716/gcc/domwalk.c:188
#4 0x0000000000a0762a in substitute_and_fold (
get_value_fn=get_value_fn@entry=0x9942f0 <get_constant_value(tree)>,
fold_fn=fold_fn@entry=0x99bfa0 <ccp_fold_stmt(gimple_stmt_iterator*)>,
do_dce=do_dce@entry=true)
at ../../gcc-5.2.1-20150716/gcc/tree-ssa-propagate.c:1272
#5 0x0000000000993b41 in ccp_finalize ()
at ../../gcc-5.2.1-20150716/gcc/tree-ssa-ccp.c:941
#6 do_ssa_ccp () at ../../gcc-5.2.1-20150716/gcc/tree-ssa-ccp.c:2382
#7 (anonymous namespace)::pass_ccp::execute (this=<optimized out>)
at ../../gcc-5.2.1-20150716/gcc/tree-ssa-ccp.c:2414
#8 0x000000000083aa9e in execute_one_pass (pass=pass@entry=0x12221d0)
at ../../gcc-5.2.1-20150716/gcc/passes.c:2330
#9 0x000000000083aeb6 in execute_pass_list_1 (pass=0x12221d0)
at ../../gcc-5.2.1-20150716/gcc/passes.c:2382
---Type <return> to continue, or q <return> to quit---
#10 0x000000000083aec8 in execute_pass_list_1 (pass=0x1222050,
pass@entry=0x1221f90) at ../../gcc-5.2.1-20150716/gcc/passes.c:2383
#11 0x000000000083af09 in execute_pass_list (fn=0x7ffff193cf18, pass=0x1221f90)
at ../../gcc-5.2.1-20150716/gcc/passes.c:2393
#12 0x00000000005fa268 in cgraph_node::expand (this=this@entry=0x7ffff183a300)
at ../../gcc-5.2.1-20150716/gcc/cgraphunit.c:1895
#13 0x00000000005fb4ac in expand_all_functions ()
at ../../gcc-5.2.1-20150716/gcc/cgraphunit.c:2031
#14 symbol_table::compile (this=0x7ffff183c000)
at ../../gcc-5.2.1-20150716/gcc/cgraphunit.c:2384
#15 0x00000000005fc8b8 in symbol_table::finalize_compilation_unit (
this=0x7ffff183c000) at ../../gcc-5.2.1-20150716/gcc/cgraphunit.c:2461
#16 0x00000000005114cb in c_write_global_declarations ()
at ../../gcc-5.2.1-20150716/gcc/c/c-decl.c:10798
#17 0x00000000008d8d55 in compile_file ()
at ../../gcc-5.2.1-20150716/gcc/toplev.c:613
#18 0x00000000004fde1f in do_compile ()
at ../../gcc-5.2.1-20150716/gcc/toplev.c:2067
#19 toplev::main (this=this@entry=0x7fffffffdce0, argc=argc@entry=13,
argv=argv@entry=0x7fffffffdde8)
at ../../gcc-5.2.1-20150716/gcc/toplev.c:2165
#20 0x00000000004fe7aa in main (argc=13, argv=0x7fffffffdde8)
at ../../gcc-5.2.1-20150716/gcc/main.c:39
