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Remove the local register allocator.

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Please use the fast allocator instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106051 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-06-15 21:58:33 +00:00
parent bf37850e42
commit 8a3eab9b20
32 changed files with 16 additions and 1335 deletions
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docs/CodeGenerator.html
+13 -13
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@@ -1594,22 +1594,22 @@ bool RegMapping_Fer::compatible_class(MachineFunction &mf,
different register allocators:</p>
<ul>
<li><i>Simple</i> &mdash; This is a very simple implementation that does not
keep values in registers across instructions. This register allocator
immediately spills every value right after it is computed, and reloads all
used operands from memory to temporary registers before each
instruction.</li>
<li><i>Local</i> &mdash; This register allocator is an improvement on the
<i>Simple</i> implementation. It allocates registers on a basic block
level, attempting to keep values in registers and reusing registers as
appropriate.</li>
<li><i>Linear Scan</i> &mdash; <i>The default allocator</i>. This is the
well-know linear scan register allocator. Whereas the
<i>Simple</i> and <i>Local</i> algorithms use a direct mapping
implementation technique, the <i>Linear Scan</i> implementation
uses a spiller in order to place load and stores.</li>
<li><i>Fast</i> &mdash; This register allocator is the default for debug
builds. It allocates registers on a basic block level, attempting to keep
values in registers and reusing registers as appropriate.</li>
<li><i>PBQP</i> &mdash; A Partitioned Boolean Quadratic Programming (PBQP)
based register allocator. This allocator works by constructing a PBQP
problem representing the register allocation problem under consideration,
solving this using a PBQP solver, and mapping the solution back to a
register assignment.</li>
</ul>
<p>The type of register allocator used in <tt>llc</tt> can be chosen with the
@@ -1617,9 +1617,9 @@ bool RegMapping_Fer::compatible_class(MachineFunction &amp;mf,
<div class="doc_code">
<pre>
$ llc -regalloc=simple file.bc -o sp.s;
$ llc -regalloc=local file.bc -o lc.s;
$ llc -regalloc=linearscan file.bc -o ln.s;
$ llc -regalloc=fast file.bc -o fa.s;
$ llc -regalloc=pbqp file.bc -o pbqp.s;
</pre>
</div>