more edits

This release includes new native code generators for <a

href="#alpha-be">Alpha</a>, <a href="#ia64-be">IA-64</a>, and <a

href="#sparcv8">SPARC-V8</a> (32-bit SPARC).  These code generators are still

beta quality, but are progressing rapidly.

beta quality, but are progressing rapidly.  The Alpha backend is implemented

with an eye towards being compatible with the widely used SimpleScalar

simulator.

</p>

</div>

</div>

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<div class="doc_subsubsection"><a name="customccs">New Support For Custom

<div class="doc_subsubsection"><a name="customccs">New Support for Per-Function

Calling Conventions</a></div>

<div class="doc_text">

<p>LLVM 1.5 adds supports for <a href="LangRef.html#callingconv">custom and

target-specific calling conventions</a>.  Traditionally, the LLVM code

generators match the native C calling conventions for a target.  This is

important for compatibility, but is not very flexible.  This release allows

custom calling conventions to be established for functions, and defines three

target-independent conventions (C call, fast call, and cold call) which may be

supported by code generators.  When possible, the LLVM optimizer promotes C

<p>LLVM 1.5 adds supports for <a href="LangRef.html#callingconv">per-function

calling conventions</a>.  Traditionally, the LLVM code generators match the

native C calling conventions for a target.  This is important for compatibility,

but is not very flexible.  This release allows custom calling conventions to be

established for functions, and defines three target-independent conventions (<a

href="LangRef.html#callingconv">C call, fast call, and cold call</a>) which may

be supported by code generators.  When possible, the LLVM optimizer promotes C

functions to use the "fastcc" convention, allowing the use of more efficient

calling sequences (e.g., parameters are passed in registers in the X86 target).

</p>

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<div class="doc_subsubsection"><a name="tailcalls">New Support for

"Proper Tail Calls"</a></div>

Proper Tail Calls</a></div>

<div class="doc_text">

<p>The release now includes support for <a

      counting</a> and llvm-gcc now implements the GCC

      <tt>__builtin_popcount</tt>, <tt>__builtin_ctz</tt>, and

      <tt>__builtin_clz</tt> builtins.</li>

  <li>LLVM now builds on HP-UX with the HP aCC Compiler.</li>

  <li>LLVM now mostly builds on HP-UX with the HP aCC Compiler.</li>

  <li>The LLVM X86 backend can now emit Cygwin-compatible .s files.</li>

  <li>LLVM now includes workarounds in the code generator generator which

      reduces the likelyhood of <a href="http://llvm.cs.uiuc.edu/PR448">GCC

<li>The code generator now uses information about takes advantage of commutative

two-address instructions when performing register allocation.</li>

<li>The optimizer now eliminates simple cases where redundant conditions exist

between neighboring blocks.</li>

<li>The reassociation pass (which turns (1+X+3) into (X+1+3) among other

things), is more aggressive an intelligent.</li>

</ol>

</div>

<p>Code Generator Bugs:</p>

<ol>

   <li><a href="http://llvm.cs.uiuc.edu/PR490">[cbackend] Logical constant 

       expressions (and/or/xor) not implemented</a></li>

       expressions (and/or/xor) not implemented</a>.</li>

   <li><a href="http://llvm.cs.uiuc.edu/PR511">[cbackend] C backend does not 

       respect 'volatile'</a></li>

       respect 'volatile'</a>.</li>

   <li>The JIT sometimes miscompiled globals and constant pool entries for

       64-bit integer constants on 32-bit hosts.</li>

</ol>

<p>Bugs in the C/C++ front-end:</p>