http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55142
--- Comment #20 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-11-07 18:35:13 UTC --- If you compile the testcase with the unmodified compiler but without -fPIC, you get in the assembly file: movl %edx, _dl_rtld_map-1073742800(,%eax,4) I presume that's wrong, correct? Yet the RTL instruction is: (insn:TI 43 38 44 4 (set (mem/f:SI (zero_extend:DI (plus:SI (ashift:SI (reg:SI 0 ax [87]) (const_int 2 [0x2])) (const:SI (plus:SI (symbol_ref:SI ("_dl_rtld_map") [flags 0x42] <var_decl 0x7ffff6d2b7b8 _dl_rtld_map>) (const_int -1073742800 [0xffffffffbffffc30]))))) [3 *_8+0 S4 A32]) (reg:SI 1 dx [orig:82 dyn ] [82])) pr55142.c:32 65 {*movsi_internal} (expr_list:REG_DEAD (reg:SI 0 ax [87]) (nil))) and there is a zero_extend.