------- Comment #5 from amodra at gmail dot com 2010-01-28 02:49 ------- OK, so at the time we call make_decl_rtl for mrSurfaceList::operator[]
(gdb) bt #0 rs6000_elf_encode_section_info (decl=0x40402a00, rtl=0x404014a0, first=1) at /home/alan/src/gcc/gcc/config/rs6000/rs6000.c:23487 #1 0x1082a4e4 in make_decl_rtl (decl=0x40402a00) at /home/alan/src/gcc/gcc/varasm.c:1471 #2 0x1082b924 in notice_global_symbol (decl=0x40402a00) at /home/alan/src/gcc/gcc/varasm.c:1628 #3 0x108839e8 in cgraph_mark_reachable_node (node=0x4035c1b0) at /home/alan/src/gcc/gcc/cgraph.c:1479 #4 0x10889fd0 in cgraph_analyze_functions () at /home/alan/src/gcc/gcc/cgraphunit.c:980 #5 0x1088c250 in cgraph_finalize_compilation_unit () at /home/alan/src/gcc/gcc/cgraphunit.c:1073 #6 0x1012fbdc in cp_write_global_declarations () at /home/alan/src/gcc/gcc/cp/decl2.c:3780 we see these flags on the function decl: addressable used public static weak autoinline decl_5 The weak flag makes default_binds_local_p decide that this is non-local so doesn't set SYMBOL_REF_LOCAL_P on the rtl. Later, here: (gdb) bt #0 cgraph_make_node_local (node=0x4035c1b0) at /home/alan/src/gcc/gcc/cgraph.c:2157 #1 0x106e15e4 in modify_function () at /home/alan/src/gcc/gcc/tree-sra.c:3798 #2 ipa_early_sra () at /home/alan/src/gcc/gcc/tree-sra.c:3891 #3 0x1051f750 in execute_one_pass (pass=0x11045634) at /home/alan/src/gcc/gcc/passes.c:1522 #4 0x1051fac4 in execute_pass_list (pass=0x11045634) at /home/alan/src/gcc/gcc/passes.c:1577 #5 0x1051fadc in execute_pass_list (pass=0x11045470) at /home/alan/src/gcc/gcc/passes.c:1578 #6 0x105221d4 in do_per_function_toporder (pass=0x11045408) at /home/alan/src/gcc/gcc/passes.c:1120 #7 execute_ipa_pass_list (pass=0x11045408) at /home/alan/src/gcc/gcc/passes.c:1759 #8 0x1088c034 in ipa_passes () at /home/alan/src/gcc/gcc/cgraphunit.c:1716 #9 cgraph_optimize () at /home/alan/src/gcc/gcc/cgraphunit.c:1775 #10 0x1088c25c in cgraph_finalize_compilation_unit () at /home/alan/src/gcc/gcc/cgraphunit.c:1082 #11 0x1012fbdc in cp_write_global_declarations () at /home/alan/src/gcc/gcc/cp/decl2.c:3780 a bunch of flags on the function decl are cleared, including the weak flag. So rs6000_function_ok_for_sibcall quite happily says that a sibcall is OK, ***but the rtl flags have not been updated***. In particular, SYMBOL_REF_LOCAL_P clear stops rs6000.md:sibcall_value_local32 from matching, and we try to use sibcall_value_nonlocal_sysv. Seems to me that the rtl flags need updating in cgraph_make_node_local. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42344