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llvm-svn: 27822
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Chris Lattner 2006-04-19 04:02:47 +00:00
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@ -87,7 +87,8 @@ bug</a>. In addition, llvm-gcc4 implements support for many new features,
including GCC inline assembly, generic vector support, SSE and Altivec
intrinsics, and several new GCC attributes. In addition, llvm-gcc4 is
significantly faster than llvm-gcc3, respects -O options, its -c/-S options
correspond to GCC's (they emit native code).</p>
correspond to GCC's (they emit native code), and it has debugging support well
underway.</p>
<p>If you can use it, llvm-gcc4 is offers significant new functionality, and we
hope that it will replace llvm-gcc3 completely in a future release.
@ -172,7 +173,7 @@ are used.
</div>
<!--_________________________________________________________________________-->
<div class="doc_subsubsection"><a name="othernew">Optimizer
<div class="doc_subsubsection"><a name="optimizernew">Optimizer
Improvements</a></div>
<div class="doc_text">
@ -187,23 +188,56 @@ Improvements</a></div>
bits are demanded or not.</li>
<li>The Scalar Replacement of Aggregates pass (<tt>-scalarrepl</tt>) can now
promote simple unions to registers.</li>
<li>The Reassociation pass (<tt>-reassociate</tt>) can now
factor expressions, e.g. turning "A*A+A*B" into "A*(A+B)".</li>
<li>Several LLVM passes are <a href="http://llvm.org/PR681">significantly
faster</a>.</li>
</ul>
</div>
<!--_________________________________________________________________________-->
<div class="doc_subsubsection"><a name="codgennew">Code Generator
Improvements</a></div>
<div class="doc_text">
<ul>
<li>LLVM has a new prepass (before register allocation) list scheduler, which
supports bottom-up and top-down scheduling, pluggable priority functions and
pluggable hazard recognizers. The X86 backend uses this to reduce register
pressure and RISC targets schedule based on operation latency.</li>
<li>The tblgen-based target description framework introduced in LLVM 1.6 has
several new features, useful for targets that can fold loads and stores into
operations, and features that make the .td files more expressive.</li>
<li>The instruction selector is significantly faster in 1.7 than in 1.6.</li>
<li>The X86, Alpha and Itanium backends use new DAG-DAG instruction selectors,
making them easier to maintain and generate slightly better code.</li>
<li>The X86 backend now supports generation of Scalar SSE code for scalar FP
expressions. LLVM provides significantly better performance with Scalar SSE
instructions than it does with the Intel floating point stack
instructions.</li>
<li>The Itanium backend now has a bundling pass, which improves performance
by ~10% and reduces code size (previously it unconditionally inserted a stop
bit after every instruction).</li>
</ul>
</div>
<!--_________________________________________________________________________-->
<div class="doc_subsubsection"><a name="othernew">Other New Features</a></div>
<div class="doc_text">
<ul>
<li>The Mac OS/X PowerPC and X86 backends now have initial support Darwin DWARF
debugging information, however, debug info generation has been disabled for
the 1.7 release in llvmgcc4.</li>
<li>LLVM includes the new <a href="docs/CommandGuide/html/llvm-config.html">
llvm-config</a> utility, which makes it easier to build and link programs
against the LLVM libraries when not using the LLVM makefiles.</li>
<li>LLVM now supports first class global ctor/dtor initialization lists, no
longer forcing targets to use "__main".</li>
<li>LLVM supports assigning globals and functions to a particular section
in the result executable using the GCC section attribute.</li>
<li><a href="ExtendingLLVM.html">Adding intrinsics to LLVM</a> is now
significantly easier.</li>
significantly easier.</li>
<li>llvmgcc4 now fully supports C99 Variable Length Arrays, including dynamic
stack deallocation.</li>
@ -218,6 +252,8 @@ significantly easier.</li>
<div class="doc_text">
<ul>
<li>The official LLVM URL is now <a href="http://llvm.org/">
http://llvm.org/</a>.</li>
<li>The LLVM intrinsics used to be overloaded based on type: for example,
<a href="LangRef.html#int_ctpop"><tt>llvm.ctpop</tt></a> could work with any
integer datatype. They are now separated into different intrinsics with