Author: Gerd Isenberg
Date: 01:32:21 01/03/05
Go up one level in this thread
On January 02, 2005 at 19:59:18, Daniel Mehrmannn wrote: >Hi :) > >I'm playing a little bit ping pong with my intel compiler 8.1. > >After added /QxW i got the message "remark: LOOP WAS VECTORIZED." >What does it mean ? > >ps: engine runs without any problems :) > >thanks :) Hi Daniel, i am not familar with icc but i guess this message means i kind of loop unrolling, probably using mmx- or sse-vector instructions (byte, 16-bit words or 32-bit dwords). Would be interesting to inspect the assembly. For instance if you have following loop: unsigned char a[16], b[16], c[16]; ... for (int i=0; i < 16; i++) c[i] = max (a[i], b[i]); // or other binary operations it might be possible to do it with a few sse2 simd instructions: movdqa xmm0, [a] ; addresses should be 16 Byte aligned pmaxub xmm0, [b] movdqa [c], xmm0 As i said - only a guess. Gerd
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.