Also, i tried grepping for "loop" and then negate all loop related params:
linux-gec2:~/projects/lu # gcc -c -O3 -fno-align-loops -fno-move-loop-invariants -fno-peel-loops -fno-prefetch-loop-arrays -fno-rerun-cse-after-loop -fno-reschedule-modulo-scheduled-loops -fno-tree-loop-im -fno-tree-loop-ivcanon -fno-tree-loop-linear -fno-tree-loop-optimize -fno-tree-vect-loop-version -fno-unroll-all-loops -fno-unroll-loops -fno-unsafe-loop-optimizations -fno-unswitch-loops -fno-loop-optimize -fno-rerun-loop-opt main.c linux-gec2:~/projects/lu # objdump -S main.o main.o: file format elf32-i386 Disassembly of section .text: 00000000 <func>: 0: 55 push %ebp 1: 31 c0 xor %eax,%eax 3: 89 e5 mov %esp,%ebp 5: 8d 76 00 lea 0x0(%esi),%esi 8: 83 c0 01 add $0x1,%eax b: 83 f8 07 cmp $0x7,%eax e: c7 05 00 00 00 00 00 movl $0x0,0x0 15: 00 00 00 18: 7e ee jle 8 <func+0x8> 1a: 5d pop %ebp 1b: c3 ret 1c: 8d 74 26 00 lea 0x0(%esi,%eiz,1),%esi Just need to figure out which param is the good one :) On Mon, Dec 21, 2009 at 16:41, Dotan Shavit <do...@shavitos.com> wrote: > On Monday 21 December 2009 14:00:39 Shachar Shemesh wrote: >> Where it gets worrying is when I try to cancel loop unrolling. I tried >> "-fno-unroll-loops" and "-fno-peel-loops", to no effect. I even tried >> messing with the --param option (max-unrolled-insns, max-unroll-times, >> max-peel-times) to no noticeable effect >> > max-completely-peeled-insns is your friend > > This param's value is also the difference between -O3 and -O2 you were missing > > _______________________________________________ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > -- Charles de Gaulle - "The better I get to know men, the more I find myself loving dogs." - http://www.brainyquote.com/quotes/authors/c/charles_de_gaulle.html _______________________________________________ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
