From: Jan Michel <j.michel@gsi.de>
Date: Thu, 2 Oct 2014 12:07:42 +0000 (+0200)
Subject: optimization regarding all-fired and none-fired states in unpacking. Gained more... 
X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=001c53d70b872fd021f289d5fed2db6dda46424e;p=mvd_soft.git

optimization regarding all-fired and none-fired states in unpacking. Gained more than factor 2
---

diff --git a/s-curves/cpp_based-on-dabc-lib/unpacker.cxx b/s-curves/cpp_based-on-dabc-lib/unpacker.cxx
index 0d93c78..e276aed 100644
--- a/s-curves/cpp_based-on-dabc-lib/unpacker.cxx
+++ b/s-curves/cpp_based-on-dabc-lib/unpacker.cxx
@@ -281,11 +281,22 @@ signed analyzeData(hadaq::RawSubevent* sub, unsigned ix, unsigned datalen, unsig
       rowcount[row]++;
       while(1) {
         d = sub->Data(ix++);
-        //printf("%08x", d);
-        for(int i = 0; i < 0x20; i++) {
-          pixelprob[1152 * row + pos*0x20 + i] += d & 0x1;
-          d = d >> 1;
+        //////loop over all bits, optimized for all-set and all-clear states
+        unsigned start = 1152 * row + pos*0x20;
+        if(d == 0) {}
+        else if(d == 0xFFFFFFFF) {
+          for(unsigned i = start; i < start + 0x20; i++) {
+            pixelprob[i] ++;
+            }
+          }
+        else {  
+          for(unsigned i = start; i < start + 0x20; i++) {
+            pixelprob[i] += d & 0x1;
+            d >>= 1;
+            }
           }
+        /////////////end add loop  
+        
         pos++;
         if(ix >= RocEnd) break;
         }