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Bill Wendling
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@ -74,9 +74,9 @@ Release Notes</a>.</h1>
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<p>The LLVM 3.1 distribution currently consists of code from the core LLVM
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repository (which roughly includes the LLVM optimizers, code generators and
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supporting tools), and the Clang repository. In
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addition to this code, the LLVM Project includes other sub-projects that are
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in development. Here we include updates on these subprojects.</p>
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supporting tools), and the Clang repository. In addition to this code, the
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LLVM Project includes other sub-projects that are in development. Here we
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include updates on these subprojects.</p>
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<!--=========================================================================-->
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<h3>
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@ -107,10 +107,9 @@ Release Notes</a>.</h1>
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Objective C</a>.</li>
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</ul>
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<p>For more details about the changes to Clang since the 3.0 release, see the
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<a href="http://clang.llvm.org/docs/ReleaseNotes.html">Clang release notes</a>
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</p>
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<p>For more details about the changes to Clang since the 3.0 release, see the
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<a href="http://clang.llvm.org/docs/ReleaseNotes.html">Clang release
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notes.</a></p>
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<p>If Clang rejects your code but another compiler accepts it, please take a
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look at the <a href="http://clang.llvm.org/compatibility.html">language
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@ -125,6 +124,7 @@ Release Notes</a>.</h1>
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</h3>
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<div>
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<p><a href="http://dragonegg.llvm.org/">DragonEgg</a> is a
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<a href="http://gcc.gnu.org/wiki/plugins">gcc plugin</a> that replaces GCC's
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optimizers and code generators with LLVM's. It works with gcc-4.5 and gcc-4.6
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@ -135,8 +135,7 @@ Release Notes</a>.</h1>
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<p>The 3.1 release has the following notable changes:</p>
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<ul>
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<ul>
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<li>Partial support for gcc-4.7. Ada support is poor, but other languages work
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fairly well.</li>
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@ -151,7 +150,6 @@ Release Notes</a>.</h1>
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aliasing and type ranges to the LLVM optimizers.</li>
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<li>A regression test-suite was added.</li>
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</ul>
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</div>
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@ -172,8 +170,6 @@ Release Notes</a>.</h1>
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implementations of this and other low-level routines (some are 3x faster than
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the equivalent libgcc routines).</p>
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<p>....</p>
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</div>
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<!--=========================================================================-->
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@ -189,8 +185,6 @@ Release Notes</a>.</h1>
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expression parsing (particularly for C++) and uses the LLVM JIT for target
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support.</p>
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<p>...</p>
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</div>
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<!--=========================================================================-->
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@ -204,8 +198,6 @@ Release Notes</a>.</h1>
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licensed</a> under the MIT and UIUC license, allowing it to be used more
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permissively.</p>
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<p>...</p>
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</div>
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<!--=========================================================================-->
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@ -215,16 +207,12 @@ Release Notes</a>.</h1>
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<div>
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<p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an
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implementation of a Java Virtual Machine (Java VM or JVM) that uses LLVM for
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static and just-in-time compilation.
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<p>The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation
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of a Java Virtual Machine (Java VM or JVM) that uses LLVM for static and
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just-in-time compilation.</p>
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<p>In the LLVM 3.1 time-frame, VMKit has had significant improvements on both
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runtime and startup performance:</p>
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<ul>
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<li>...</li>
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</ul>
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<p>In the LLVM 3.1 time-frame, VMKit has had significant improvements on both
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runtime and startup performance.</p>
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</div>
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@ -236,25 +224,23 @@ Release Notes</a>.</h1>
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<div>
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<p><a href="http://polly.llvm.org/">Polly</a> is an <em>experimental</em>
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<p><a href="http://polly.llvm.org/">Polly</a> is an <em>experimental</em>
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optimizer for data locality and parallelism. It currently provides high-level
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loop optimizations and automatic parallelisation (using the OpenMP run time).
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Work in the area of automatic SIMD and accelerator code generation was
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started.
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started.</p>
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<p>Within the LLVM 3.1 time-frame there were the following highlights:</p>
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<p>Within the LLVM 3.1 time-frame there were the following highlights:</p>
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<ul>
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<ul>
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<li>Polly became an official LLVM project</li>
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<li>Polly can be loaded directly into clang (Enabled by '-O3 -mllvm -polly'
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)</li>
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<li>An automatic scheduling optimizer (derived from <a
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href="http://pluto-compiler.sourceforge.net/">Pluto</a>) was integrated. It
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performs loop transformations to optimize for data-locality and parallelism.
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The transformations include, but are not limited to interchange, fusion,
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fission, skewing and tiling.
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</li>
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</ul>
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<li>Polly can be loaded directly into clang (enabled by '-O3 -mllvm -polly')</li>
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<li>An automatic scheduling optimizer (derived
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from <a href="http://pluto-compiler.sourceforge.net/">Pluto</a>) was
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integrated. It performs loop transformations to optimize for data-locality
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and parallelism. The transformations include, but are not limited to
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interchange, fusion, fission, skewing and tiling.</li>
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</ul>
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</div>
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@ -447,7 +433,6 @@ Release Notes</a>.</h1>
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A full featured assembler and direct-to-object support for ARM.</li>
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<li><a href="#blockplacement">Basic Block Placement</a>
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Probability driven basic block placement.</li>
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<li>....</li>
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</ul>
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</div>
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@ -463,22 +448,22 @@ Release Notes</a>.</h1>
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<p>LLVM IR has several new features for better support of new targets and that
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expose new optimization opportunities:</p>
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<ul>
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<li>A new type representing 16 bit <i>half</i> floating point values has
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been added.</li>
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<li>IR now supports vectors of pointers, including vector GEPs.</li>
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<li>Module flags have been introduced. They convey information about the
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module as a whole to LLVM subsystems. This is currently used to encode
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Objective C ABI information.</li>
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<li>Loads can now have range metadata attached to them to describe the
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possible values being loaded.</li>
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<li>The <tt>llvm.ctlz</tt> and <tt>llvm.cttz</tt> intrinsics now have an
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additional argument which indicates whether the behavior of the intrinsic
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is undefined on a zero input. This can be used to generate more efficient
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code on platforms that only have instructions which don't return the type
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size when counting bits in 0.</li>
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<li>....</li>
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</ul>
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<ul>
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<li>A new type representing 16 bit <i>half</i> floating point values has
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been added.</li>
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<li>IR now supports vectors of pointers, including vector GEPs.</li>
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<li>Module flags have been introduced. They convey information about the
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module as a whole to LLVM subsystems. This is currently used to encode
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Objective C ABI information.</li>
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<li>Loads can now have range metadata attached to them to describe the
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possible values being loaded.</li>
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<li>The <tt>llvm.ctlz</tt> and <tt>llvm.cttz</tt> intrinsics now have an
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additional argument which indicates whether the behavior of the intrinsic
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is undefined on a zero input. This can be used to generate more efficient
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code on platforms that only have instructions which don't return the type
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size when counting bits in 0.</li>
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</ul>
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</div>
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<!--=========================================================================-->
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@ -504,7 +489,6 @@ Release Notes</a>.</h1>
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<li>Inline cost heuristics have been completely overhauled and now closely
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model constant propagation through call sites, disregard trivially dead
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code costs, and can model C++ STL iterator patterns.</li>
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<li>....</li>
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</ul>
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</div>
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@ -527,7 +511,6 @@ Release Notes</a>.</h1>
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<li>The integrated assembler can optionally emit debug information when
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assembling a </tt>.s</tt> file. It can be enabled by passing the
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<tt>-g</tt> option to <tt>llvm-mc</tt>.</li>
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<li>....</li>
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</ul>
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</div>
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@ -683,12 +666,8 @@ syntax, there are still significant gaps in that support.</p>
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<div>
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<p>Support for Qualcomm's Hexagon VLIW processor has been added.</p>
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<ul>
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<li>....</li>
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<li>Support for Qualcomm's Hexagon VLIW processor has been added.</li>
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</ul>
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</div>
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@ -720,7 +699,6 @@ syntax, there are still significant gaps in that support.</p>
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<li>LLVM 3.0 and earlier automatically added the returns_twice fo functions
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like setjmp based on the name. This functionality was removed in 3.1.
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This affects Clang users, if -ffreestanding is used.</li>
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<li>....</li>
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</ul>
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</div>
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@ -767,9 +745,9 @@ syntax, there are still significant gaps in that support.</p>
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<li><code>llvm::getTrapFunctionName()</code></li>
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<li><code>llvm::EnableSegmentedStacks</code></li>
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</ul></li>
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<li>The MDBuilder class has been added to simplify the creation of
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metadata.</li>
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<li>....</li>
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<li>The <code>MDBuilder</code> class has been added to simplify the creation
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of metadata.</li>
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</ul>
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</div>
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@ -791,7 +769,6 @@ syntax, there are still significant gaps in that support.</p>
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<li>The <tt>llvm-ld</tt> tool has been removed. The clang driver provides a
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more reliable solution for turning a set of bitcode files into a binary.
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To merge bitcode files <tt>llvm-link</tt> can be used instead.</li>
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<li>....</li>
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</ul>
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</div>
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