Itanium Performance Insights from the IMPACT Compiler
Itanium Performance Insights from the IMPACT Compiler
Itanium Performance Insights from the IMPACT Compiler
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Hot Chips 13<br />
August 21, 2001<br />
Hyperblock Transformation<br />
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Example <strong>from</strong> 164.gzip deflate()<br />
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Predicate<br />
Definition<br />
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• Commonly executed code<br />
pulled toge<strong>the</strong>r into a<br />
straight-line sequence<br />
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Implicit NOP<br />
Explicit NOP<br />
CB166<br />
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• Serial branch execution<br />
replaced with parallel<br />
predicate evaluation<br />
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• Compromise between ILP<br />
and code size<br />
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66%<br />
1%<br />
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– Bundling reduces explicit<br />
horizontal NOPs<br />
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0%<br />
CB165<br />
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– Interlocking reduces explicit<br />
vertical NOPs<br />
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0%<br />
33%<br />
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<strong>Itanium</strong> <strong>Performance</strong> <strong>Insights</strong> <strong>from</strong> <strong>the</strong> <strong>IMPACT</strong> <strong>Compiler</strong><br />
<strong>IMPACT</strong>
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