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POOpenCL kernel not vectorized
 

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    <p>I am trying to build a kernel to do parallel string search. To this end I tend to use a finite state machine. The transition table of the fsm is in the kernel argument states. The code:</p> <pre><code> __kernel void Find ( __constant char *text, const int offset, const int tlenght, __constant char *characters, const int clength, const int maxlength, __constant int *states, const int statesdim){ private char c; private int state; private const int id = get_global_id(0); if (id&lt;(tlenght-maxlength)) { private int cIndex,sd,s,k; for (int i=0; i&lt;maxlength; i++) { c = text[i+offset]; cIndex = -1; for (int j=0; j&lt;clength; j++) { if (characters[j]==c) { cIndex = j; } } if (cIndex==-1) { state = 0; break; } else { s = states[state+cIndex*statesdim]; } if (state&lt;=0) break; } } } </code></pre> <p>If I compile this kernel using iocgui, I get the result: </p> <pre><code>Using default instruction set architecture. Intel OpenCL CPU device was found! Device name: Pentium(R) Dual-Core CPU T4400 @ 2.20GHz Device version: OpenCL 1.1 (Build 31360.31426) Device vendor: Intel(R) Corporation Device profile: FULL_PROFILE Build started Kernel &lt;Find&gt; was successfully vectorized Done. Build succeeded! </code></pre> <p>When I change the line where the new state is determined to:</p> <pre><code>state = states[state+cIndex*statesdim]; </code></pre> <p>The result is:</p> <pre><code>Using default instruction set architecture. Intel OpenCL CPU device was found! Device name: Pentium(R) Dual-Core CPU T4400 @ 2.20GHz Device version: OpenCL 1.1 (Build 31360.31426) Device vendor: Intel(R) Corporation Device profile: FULL_PROFILE Build started Kernel &lt;Find&gt; was not vectorized Done. Build succeeded! </code></pre>
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