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Explain what ExeDepsFix does.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145253 91177308-0d34-0410-b5e6-96231b3b80d8
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Jakob Stoklund Olesen 2011-11-28 18:03:11 +00:00
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@ -942,9 +942,12 @@ be used to verify some algorithms.
comparisons, turning them into various optimized code sequences (e.g.
using the SSE4/AVX "blend" instructions).</li>
<li>The SSE execution domain fix pass and the ARM NEON move fix pass have been
merged to a target independent execution dependency fix pass. Targets can
override the <code>getExecutionDomain</code> and
<code>setExecutionDomain</code> hooks to use it.</li>
merged to a target independent execution dependency fix pass. This pass is
used to select alternative equivalent opcodes in a way that minimizes
execution domain crossings. Closely connected instructions are moved to
the same execution domain when possible. Targets can override the
<code>getExecutionDomain</code> and <code>setExecutionDomain</code> hooks
to use the pass.</li>
</ul>
</div>