------- Comment #1 from siarhei dot siamashka at gmail dot com 2008-10-04 02:48 ------- For -Os optimization, the generated code is much better:
00000000 <unrolled_loop_fn>: 0: 55 push %ebp 1: 89 e5 mov %esp,%ebp 3: 53 push %ebx 4: 83 ec 04 sub $0x4,%esp 7: 8b 5d 08 mov 0x8(%ebp),%ebx a: eb 0a jmp 16 <unrolled_loop_fn+0x16> c: e8 fc ff ff ff call d <unrolled_loop_fn+0xd> 11: e8 fc ff ff ff call 12 <unrolled_loop_fn+0x12> 16: 83 eb 02 sub $0x2,%ebx 19: 79 f1 jns c <unrolled_loop_fn+0xc> 1b: 80 e3 01 and $0x1,%bl 1e: 74 05 je 25 <unrolled_loop_fn+0x25> 20: e8 fc ff ff ff call 21 <unrolled_loop_fn+0x21> 25: 5a pop %edx 26: 5b pop %ebx 27: 5d pop %ebp 28: c3 ret -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37734
