This is with GCC trunk, rev 148041: I have a cpp file where g++ just takes forever with 100% CPU usage and constant (low) memory usage. I am waiting now for 20 minutes without any visible progress. I attached with GDB to the process and this is some of the details I am seeing: az@gcomputer:~$ gdb /opt/gcc4.4-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/cc1plus 32654 GNU gdb 6.8-debian Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu"... Really redefine built-in command "frame"? (y or n) [answered Y; input not from terminal] Really redefine built-in command "thread"? (y or n) [answered Y; input not from terminal] Really redefine built-in command "start"? (y or n) [answered Y; input not from terminal] Attaching to program: /opt/gcc4.4-trunk/libexec/gcc/x86_64-unknown-linux-gnu/4.5.0/cc1plus, process 32654 Reading symbols from /usr/lib/libmpfr.so.1...done. Loaded symbols for /usr/lib/libmpfr.so.1 Reading symbols from /usr/lib/libgmp.so.3...done. Loaded symbols for /usr/lib/libgmp.so.3 Reading symbols from /lib/libdl.so.2...done. Loaded symbols for /lib/libdl.so.2 Reading symbols from /lib/libc.so.6...done. Loaded symbols for /lib/libc.so.6 Reading symbols from /lib/ld-linux-x86-64.so.2...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 _______________________________________________________________________________ Error while running hook_stop: Value can't be converted to integer. 0x0000000000a6ebd4 in ipa_compute_jump_functions (cs=<value optimized out>) at ../../gcc/ipa-prop.c:437 437 while (TREE_CODE (rhs) == SSA_NAME && !SSA_NAME_IS_DEFAULT_DEF (rhs)) gdb> bt ful #0 0x0000000000a6ebd4 in ipa_compute_jump_functions (cs=<value optimized out>) at ../../gcc/ipa-prop.c:437 info = <value optimized out> __FUNCTION__ = "ipa_compute_jump_functions" call = <value optimized out> #1 0x0000000000000002 in ?? () No symbol table info available. #2 0x00007f11dcc99480 in ?? () No symbol table info available. #3 0x0000000002394010 in ?? () No symbol table info available. #4 0x0000000000000002 in ?? () No symbol table info available. #5 0x00007f11df850360 in ?? () No symbol table info available. #6 0x00007f11dd0b6c80 in ?? () No symbol table info available. #7 0x00007f11dd0b6d20 in ?? () No symbol table info available. #8 0x0000000002394040 in ?? () No symbol table info available. #9 0x00007f11dc83b160 in ?? () No symbol table info available. #10 0x00007f11ddb0f400 in ?? () No symbol table info available. #11 0x00007f11dc8865a0 in ?? () No symbol table info available. #12 0x000000000000003b in ?? () No symbol table info available. #13 0x00007f11dd0b6d20 in ?? () No symbol table info available. #14 0x00007f11dd0b6c80 in ?? () No symbol table info available. #15 0x0000000000a6d0d0 in ?? () No locals. #16 0x00007f11dc898600 in ?? () No symbol table info available. #17 0x00007f11dc833600 in ?? () No symbol table info available. #18 0x0000000000000000 in ?? () No symbol table info available. gdb> c ^C Program received signal SIGINT, Interrupt. _______________________________________________________________________________ Error while running hook_stop: Value can't be converted to integer. gimple_assign_single_p (gs=0x7f11dc839be0) at ../../gcc/gimple.c:1831 1831 } gdb> bt #0 gimple_assign_single_p (gs=0x7f11dc839be0) at ../../gcc/gimple.c:1831 #1 0x0000000000a6ebee in ipa_compute_jump_functions (cs=<value optimized out>) at ../../gcc/ipa-prop.c:441 #2 0x0000000000000002 in ?? () #3 0x00007f11dcc99480 in ?? () #4 0x0000000002394010 in ?? () #5 0x0000000000000002 in ?? () #6 0x00007f11df850360 in ?? () #7 0x00007f11dd0b6c80 in ?? () #8 0x00007f11dd0b6d20 in ?? () #9 0x0000000002394040 in ?? () #10 0x00007f11dc83b160 in ?? () #11 0x00007f11ddb0f400 in ?? () #12 0x00007f11dc8865a0 in ?? () #13 0x000000000000003b in ?? () #14 0x00007f11dd0b6d20 in ?? () #15 0x00007f11dd0b6c80 in ?? () #16 0x0000000000a6d0d0 in ?? () #17 0x00007f11dc898600 in ?? () #18 0x00007f11dc833600 in ?? () #19 0x0000000000000000 in ?? () gdb> c ^C Program received signal SIGINT, Interrupt. _______________________________________________________________________________ Error while running hook_stop: Value can't be converted to integer. 0x0000000000a6ebdf in ipa_compute_jump_functions (cs=<value optimized out>) at ../../gcc/ipa-prop.c:437 437 while (TREE_CODE (rhs) == SSA_NAME && !SSA_NAME_IS_DEFAULT_DEF (rhs)) gdb> list 432 return the rhs of its defining statement. */ 433 434 static inline tree 435 get_ssa_def_if_simple_copy (tree rhs) 436 { 437 while (TREE_CODE (rhs) == SSA_NAME && !SSA_NAME_IS_DEFAULT_DEF (rhs)) 438 { 439 gimple def_stmt = SSA_NAME_DEF_STMT (rhs); 440 441 if (gimple_assign_single_p (def_stmt)) gdb> bt #0 0x0000000000a6ebdf in ipa_compute_jump_functions (cs=<value optimized out>) at ../../gcc/ipa-prop.c:437 #1 0x0000000000000002 in ?? () #2 0x00007f11dcc99480 in ?? () #3 0x0000000002394010 in ?? () #4 0x0000000000000002 in ?? () #5 0x00007f11df850360 in ?? () #6 0x00007f11dd0b6c80 in ?? () #7 0x00007f11dd0b6d20 in ?? () #8 0x0000000002394040 in ?? () #9 0x00007f11dc83b160 in ?? () #10 0x00007f11ddb0f400 in ?? () #11 0x00007f11dc8865a0 in ?? () #12 0x000000000000003b in ?? () #13 0x00007f11dd0b6d20 in ?? () #14 0x00007f11dd0b6c80 in ?? () #15 0x0000000000a6d0d0 in ?? () #16 0x00007f11dc898600 in ?? () #17 0x00007f11dc833600 in ?? () #18 0x0000000000000000 in ?? () gdb> c ^C Program received signal SIGINT, Interrupt. _______________________________________________________________________________ Error while running hook_stop: Value can't be converted to integer. gimple_assign_single_p (gs=0x7f11dc839be0) at ../../gcc/gimple.c:1827 1827 { gdb> list 1822 any RHS operand, including those that perform an operation 1823 and do not have the semantics of a copy, such as COND_EXPR. */ 1824 1825 bool 1826 gimple_assign_single_p (gimple gs) 1827 { 1828 return (gimple_code (gs) == GIMPLE_ASSIGN 1829 && get_gimple_rhs_class (gimple_assign_rhs_code (gs)) 1830 == GIMPLE_SINGLE_RHS); 1831 } gdb> print gs $1 = (gimple) 0x7f11dc839be0 gdb> print *gs $2 = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, gsops = {opbase = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, def_ops = 0x7f11db7df1d0, use_ops = 0x0}, op = {0x0}}, gsmem = {membase = {opbase = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, def_ops = 0x7f11db7df1d0, use_ops = 0x0}, vdef = 0x0, vuse = 0x0}, op = {0x7f11db7dccc0}}, omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, gimple_bind = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, vars = 0x7f11db7df1d0, block = 0x0, body = 0x0}, gimple_catch = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, types = 0x7f11db7df1d0, handler = 0x0}, gimple_eh_filter = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, types = 0x7f11db7df1d0, failure = 0x0}, gimple_phi = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, capacity = 0xdb7df1d0, nargs = 0x7f11, result = 0x0, args = {{imm_use = {prev = 0x0, next = 0x0, loc = {stmt = 0x7f11db7dccc0, ssa_name = 0x7f11db7dccc0}, use = 0x7f11dcb59a80}, def = 0x202205}}}, gimple_resx = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, region = 0xdb7df1d0}, gimple_try = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, eval = 0x7f11db7df1d0, cleanup = 0x0}, gimple_wce = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, cleanup = 0x7f11db7df1d0}, gimple_asm = {membase = {opbase = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, def_ops = 0x7f11db7df1d0, use_ops = 0x0}, vdef = 0x0, vuse = 0x0}, string = 0x7f11db7dccc0 "\216", ni = 0x80, no = 0x9a, nc = 0xdcb5, op = {0x202205}}, gimple_omp_critical = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, name = 0x0}, gimple_omp_for = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, collapse = 0x0, iter = 0x0, pre_body = 0x7f11db7dccc0}, gimple_omp_parallel = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, child_fn = 0x0, data_arg = 0x0}, gimple_omp_task = {par = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, child_fn = 0x0, data_arg = 0x0}, copy_fn = 0x7f11db7dccc0, arg_size = 0x7f11dcb59a80, arg_align = 0x202205}, gimple_omp_sections = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, control = 0x0}, gimple_omp_single = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0}, gimple_omp_continue = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, control_def = 0x7f11db7df1d0, control_use = 0x0}, gimple_omp_atomic_load = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, rhs = 0x7f11db7df1d0, lhs = 0x0}, gimple_omp_atomic_store = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, val = 0x7f11db7df1d0}} gdb>
gdb> c q ^C Program received signal SIGINT, Interrupt. _______________________________________________________________________________ Error while running hook_stop: Value can't be converted to integer. 0x0000000000780a0f in gimple_assign_single_p (gs=0x7f11dc839be0) at ../../gcc/gimple.c:1831 1831 } gdb> list 1826 gimple_assign_single_p (gimple gs) 1827 { 1828 return (gimple_code (gs) == GIMPLE_ASSIGN 1829 && get_gimple_rhs_class (gimple_assign_rhs_code (gs)) 1830 == GIMPLE_SINGLE_RHS); 1831 } 1832 1833 /* Return true if GS is an assignment with a unary RHS, but the 1834 operator has no effect on the assigned value. The logic is adapted 1835 from STRIP_NOPS. This predicate is intended to be used in tuplifying gdb> print gs $4 = (gimple) 0x7f11dc839be0 gdb> print *gs $5 = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, gsops = {opbase = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, def_ops = 0x7f11db7df1d0, use_ops = 0x0}, op = {0x0}}, gsmem = {membase = {opbase = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, def_ops = 0x7f11db7df1d0, use_ops = 0x0}, vdef = 0x0, vuse = 0x0}, op = {0x7f11db7dccc0}}, omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, gimple_bind = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, vars = 0x7f11db7df1d0, block = 0x0, body = 0x0}, gimple_catch = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, types = 0x7f11db7df1d0, handler = 0x0}, gimple_eh_filter = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, types = 0x7f11db7df1d0, failure = 0x0}, gimple_phi = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, capacity = 0xdb7df1d0, nargs = 0x7f11, result = 0x0, args = {{imm_use = {prev = 0x0, next = 0x0, loc = {stmt = 0x7f11db7dccc0, ssa_name = 0x7f11db7dccc0}, use = 0x7f11dcb59a80}, def = 0x202205}}}, gimple_resx = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, region = 0xdb7df1d0}, gimple_try = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, eval = 0x7f11db7df1d0, cleanup = 0x0}, gimple_wce = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, cleanup = 0x7f11db7df1d0}, gimple_asm = {membase = {opbase = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, def_ops = 0x7f11db7df1d0, use_ops = 0x0}, vdef = 0x0, vuse = 0x0}, string = 0x7f11db7dccc0 "\216", ni = 0x80, no = 0x9a, nc = 0xdcb5, op = {0x202205}}, gimple_omp_critical = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, name = 0x0}, gimple_omp_for = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, collapse = 0x0, iter = 0x0, pre_body = 0x7f11db7dccc0}, gimple_omp_parallel = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, child_fn = 0x0, data_arg = 0x0}, gimple_omp_task = {par = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, child_fn = 0x0, data_arg = 0x0}, copy_fn = 0x7f11db7dccc0, arg_size = 0x7f11dcb59a80, arg_align = 0x202205}, gimple_omp_sections = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0, control = 0x0}, gimple_omp_single = {omp = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, body = 0x7f11db7df1d0}, clauses = 0x0}, gimple_omp_continue = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, control_def = 0x7f11db7df1d0, control_use = 0x0}, gimple_omp_atomic_load = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, rhs = 0x7f11db7df1d0, lhs = 0x0}, gimple_omp_atomic_store = {gsbase = {code = GIMPLE_ASSIGN, no_warning = 0x0, visited = 0x0, nontemporal_move = 0x0, plf = 0x0, modified = 0x0, has_volatile_ops = 0x0, pad = 0x0, subcode = 0x74, uid = 0x0, location = 0x6480dd, num_ops = 0x2, bb = 0x7f11dc8865a0, block = 0x7f11dc83a120}, val = 0x7f11db7df1d0}} gdb> q az@gcomputer:~$
This only happens with -O3. Without specific optimisation, it compiles just fine. With all other GCC versions I have tried so far (GCC 4.4, GCC 4.3, GCC 4.0 and a lot others) it works fine (with any possible optimisation).
Created attachment 17943 [details] source file after preprocessor This is the specific source after the preprocessor.
It runs now for >200 minutes, so I really think this is not normal.
Works fine with rev. 147285, fails with rev. 147953. Martin - obviously static inline tree get_ssa_def_if_simple_copy (tree rhs) { while (TREE_CODE (rhs) == SSA_NAME && !SSA_NAME_IS_DEFAULT_DEF (rhs)) { gimple def_stmt = SSA_NAME_DEF_STMT (rhs); if (gimple_assign_single_p (def_stmt)) rhs = gimple_assign_rhs1 (def_stmt); } return rhs; } doesn't terminate if the condition inside the loop is false.
Apparently I was not careful enough when turning an if branch to a while loop. I'll prepare and test a patch straight away.
Created attachment 17946 [details] Fix Ok, creating a simple testcase was not easy for me but here is a patch that includes one (and fixes the original issue too). It still needs testing but I am quite confident it will pass.
Subject: Bug 40323 Author: jamborm Date: Wed Jun 3 11:56:05 2009 New Revision: 148126 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=148126 Log: 2009-06-03 Martin Jambor <mjambor@suse.cz> PR tree-optimization/40323 * ipa-prop.c (get_ssa_def_if_simple_copy): Break if not single assignment. * testsuite/g++.dg/torture/pr40323.C: New file. Added: trunk/gcc/testsuite/g++.dg/torture/pr40323.C Modified: trunk/gcc/ChangeLog trunk/gcc/ipa-prop.c trunk/gcc/testsuite/ChangeLog
I have just verified this is fixed on the current trunk.
Thanks a lot, works just fine. :)