http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52352
--- Comment #12 from Uros Bizjak <ubizjak at gmail dot com> 2012-02-24 19:29:20 UTC --- (In reply to comment #11) > I checked a similar fix into hjl/x32/addr32, hjl/x32/gcc-4_6-branch and > hjl/x32/gcc-4_6-branch+mx32 branches. I also added "I" code to print > constant address as positive 32bit integer for x32: I think we can simply disable these two patterns on x32. This is with disabled patterns: 0000000000000000 <x32_O3_main>: 0: b8 00 00 e0 fe mov $0xfee00000,%eax 5: 8b 00 mov (%rax),%eax 7: a8 01 test $0x1,%al 9: 74 01 je c <x32_O3_main+0xc> b: 90 nop c: b8 00 00 e0 fe mov $0xfee00000,%eax 11: 8b 50 08 mov 0x8(%rax),%edx 14: 89 50 04 mov %edx,0x4(%rax) 17: c3 retq and with enabled patterns: 0000000000000000 <x32_O3_main>: 0: a1 00 00 e0 fe 00 00 movabs 0xfee00000,%eax 7: 00 00 9: a8 01 test $0x1,%al b: 74 01 je e <x32_O3_main+0xe> d: 90 nop e: a1 08 00 e0 fe 00 00 movabs 0xfee00008,%eax 15: 00 00 17: a3 04 00 e0 fe 00 00 movabs %eax,0xfee00004 1e: 00 00 20: c3 retq There is simply no need for movabs from/to mem, since there is no 64bit addresses. And code size is horrible (and I bet that the former code runs faster).
