http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55921
Bug #: 55921
Summary: Crash in verify_ssa for asm to side-steps complex
pessimization
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: amyl...@gcc.gnu.org
Created attachment 29126
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29126
testcase
verify_ssa crashes during expand for a simple testcase that uses a pair of
asms to avoid the tree pass pessimization of complex type data moves.
Observed with GCC 4.7.0 i686-pc-linux-gnu X epiphany-elf,
i686-pc-linux-gnu native Red Hat 4.7.2-2, and
i686-pc-linux-gnu native 4.8.0 20130109 (experimental) (revision 195054)
(gdb) run
Starting program: /ssd/fsf/inst/libexec/gcc/i686-pc-linux-gnu/4.8.0/cc1
-fpreprocessed tc3.i -quiet -dumpbase tc3.c -mtune=generic -march=pentiumpro
-auxbase tc3 -version -o tc3.s
GNU C (GCC) version 4.8.0 20130109 (experimental) (i686-pc-linux-gnu)
compiled by GNU C version 4.8.0 20130109 (experimental), GMP version
5.0.2, MPFR version 3.1.0, MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU C (GCC) version 4.8.0 20130109 (experimental) (i686-pc-linux-gnu)
compiled by GNU C version 4.8.0 20130109 (experimental), GMP version
5.0.2, MPFR version 3.1.0, MPC version 0.9
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 7fd55bd33553a03a09fb094c59fe563c
Program received signal SIGSEGV, Segmentation fault.
verify_ssa (check_modified_stmt=true) at ../../gcc/gcc/tree-ssa.c:942
942 if (!gimple_nop_p (stmt))
(gdb) bt
#0 verify_ssa (check_modified_stmt=true) at ../../gcc/gcc/tree-ssa.c:942
#1 0x084c6fbe in execute_function_todo (data=data@entry=0x8001c)
at ../../gcc/gcc/passes.c:1969
#2 0x084c7788 in do_per_function (
callback=0x84c6f20 <execute_function_todo(void*)>, data=0x8001c)
at ../../gcc/gcc/passes.c:1703
#3 0x084c78ba in execute_todo (flags=524316) at ../../gcc/gcc/passes.c:2001
#4 0x084cabff in execute_one_pass (pass=pass@entry=0x8dced80)
at ../../gcc/gcc/passes.c:2321
#5 0x084cb035 in execute_pass_list (pass=0x8dced80)
at ../../gcc/gcc/passes.c:2383
#6 0x0826186e in expand_function (node=0xb7be93f0)
at ../../gcc/gcc/cgraphunit.c:1641
#7 0x08263bb4 in output_in_order () at ../../gcc/gcc/cgraphunit.c:1834
#8 compile () at ../../gcc/gcc/cgraphunit.c:2038
#9 0x08263f2a in finalize_compilation_unit ()
at ../../gcc/gcc/cgraphunit.c:2120
#10 0x08137e45 in c_write_global_declarations ()
at ../../gcc/gcc/c/c-decl.c:10120
#11 0x0856d85d in compile_file () at ../../gcc/gcc/toplev.c:559
#12 0x0856f82c in do_compile () at ../../gcc/gcc/toplev.c:1878
#13 toplev_main (argc=13, argv=0xbfffeda4) at ../../gcc/gcc/toplev.c:1954
#14 0x0811a2cb in main (argc=13, argv=0xbfffeda4) at ../../gcc/gcc/main.c:36
(gdb) frame 0
#0 verify_ssa (check_modified_stmt=true) at ../../gcc/gcc/tree-ssa.c:942
942 if (!gimple_nop_p (stmt))
(gdb) p stmt
$1 = (gimple_statement_d *) 0x0
