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strip the llvm 1.9 info out of the release notes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36950 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
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@ -4,11 +4,11 @@
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link rel="stylesheet" href="llvm.css" type="text/css">
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<title>LLVM 1.9 Release Notes</title>
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<title>LLVM 2.0 Release Notes</title>
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</head>
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<body>
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<div class="doc_title">LLVM 1.9 Release Notes</div>
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<div class="doc_title">LLVM 2.0 Release Notes</div>
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<ol>
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<li><a href="#intro">Introduction</a></li>
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@ -32,13 +32,10 @@
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<div class="doc_text">
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<p>This document contains the release notes for the LLVM compiler
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infrastructure, release 1.9. Here we describe the status of LLVM, including any
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known problems and major improvements from the previous release. The most
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up-to-date version of this document (corresponding to LLVM CVS) can be found
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on the <a
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href="http://llvm.org/releases/">LLVM releases web site</a>. If you are
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not reading this on the LLVM web pages, you should probably go there because
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this document may be updated after the release.</p>
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infrastructure, release 2.0. Here we describe the status of LLVM, including any
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known problems and major improvements from the previous release. All LLVM
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releases may be downloaded from the <a href="http://llvm.org/releases/">LLVM
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releases web site</a>.
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<p>For more information about LLVM, including information about the latest
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release, please check out the <a href="http://llvm.org/">main LLVM
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@ -61,8 +58,18 @@ href="http://llvm.org/releases/">releases page</a>.</p>
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<div class="doc_text">
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<p>This is the tenth public release of the LLVM Compiler Infrastructure. This
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release incorporates a large number of enhancements, new features, and bug
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<p>This is the eleventh public release of the LLVM Compiler Infrastructure.
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Being the first major release since 1.0, we took this as an opportunity to
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break backwards compatibility with the LLVM 1.x bytecode and .ll file format.
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If you have LLVM 1.9 .ll files that you would like to upgrade to LLVM 2.x, we
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recommend the use of the stand alone <a href=#llvm-upgrade">llvm-upgrade</a>
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tool. We intend to keep compatibility with .ll and .bc formats within the 2.x
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release series.</p>
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<p>Note that while
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This
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release
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incorporates a large number of enhancements, new features, and bug
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fixes. We recommend that all users of previous LLVM versions upgrade.
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</p>
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@ -70,37 +77,7 @@ fixes. We recommend that all users of previous LLVM versions upgrade.
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="newfeatures">New Features in LLVM 1.9</a>
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</div>
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<!--_________________________________________________________________________-->
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<div class="doc_subsubsection"><a name="x86-64">New X86-64 Backend</a></div>
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<div class="doc_text">
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<p>LLVM 1.9 now fully supports the x86-64 instruction set on Mac OS/X, and
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supports it on Linux (and other operating systems) when compiling in -static
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mode. LLVM includes JIT support for X86-64, and supports both Intel EMT-64T
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and AMD-64 architectures. The X86-64 instruction set permits addressing a
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64-bit addressing space and provides the compiler with twice the
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number of integer registers to use.</p>
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</div>
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<!--_________________________________________________________________________-->
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<div class="doc_subsubsection"><a name="lto">Link-Time Optimization integration
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with native linkers</a></div>
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<div class="doc_text">
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<p>LLVM now includes <a href="LinkTimeOptimization.html">liblto</a> which can
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be used to integrate LLVM Link-Time Optimization support into a native linker.
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This allows LLVM .bc to transparently participate with linking an application,
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even when some .o files are in LLVM form and some are not.</p>
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</div>
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<!--_________________________________________________________________________-->
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<div class="doc_subsubsection"><a name="dwarf">DWARF debugging
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support for Linux, Cygwin and MinGW on X86</a></div>
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<div class="doc_text">
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<p>llvm-gcc4 now supports generating debugging info for Linux, Cygwin and MinGW.
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This extends the PPC/Darwin and X86/Darwin debugging support available in the
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1.8 release. DWARF is a standard debugging format used on many platforms.</p>
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<a name="newfeatures">New Features in LLVM 2.0</a>
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</div>
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<!--_________________________________________________________________________-->
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@ -111,17 +88,7 @@ Improvements</a></div>
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Significant changes include:</p>
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<ul>
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<li>LLVM includes a new 'predicate simplifier' pass, which
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currently performs dominator tree-based optimizations.</li>
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<li>The complete loop unroll pass now supports unrolling of
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multiple basic block loops.</li>
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<li>The 'globalopt' pass can now perform the scalar replacement of
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aggregates transformation on some heap allocations.</li>
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<li>The globalsmodref-aa alias analysis can now track 'indirect pointer
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globals' more accurately.</li>
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<li>The instruction combiner can now perform element propagation
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analysis of vector expressions, eliminating computation of vector elements
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that are not used.</li>
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<li></li>
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</ul>
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</div>
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@ -137,41 +104,21 @@ optimizes many cases more aggressively. New features include:
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</p>
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<ul>
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<li>LLVM now includes a late branch folding pass which optimizes code
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layout, performs several branch optzns, and deletes unreachable code.</li>
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<li>The code generator now support targets that have pre/post-increment
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addressing modes.</li>
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<li>LLVM now supports dynamically-loadable register allocators and
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schedulers.</li>
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<li>LLVM 1.9 includes several improvements to inline asm support,
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including support for new constraints and modifiers.</li>
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<li>The register coalescer is now more aggressive than before,
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allowing it to eliminate more copies.</li>
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<li></li>
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</ul>
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<p>In addition, the LLVM target description format has itself been extended in
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several ways:</p>
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<ul>
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<li>tblgen now allows definition of '<a
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href="TableGenFundamentals.html#multiclass">multiclasses</a>' which can be
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used to factor instruction patterns more aggressively in .td files.</li>
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<li>LLVM has a new TargetAsmInfo class which captures a variety of
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information about the target assembly language format.</li>
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<li>.td files now support "<tt>${:foo}</tt>" syntax for encoding
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subtarget-specific assembler syntax into instruction descriptions.</li>
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<li></li>
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</ul>
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<p>Further, several significant target-specific enhancements are included in
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LLVM 1.9:</p>
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LLVM 2.0:</p>
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<ul>
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<li>The LLVM ARM backend now supports more instructions
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and the use of a frame pointer. It is now possible to build
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libgcc and a simple cross compiler, but it is not considered "complete" yet.
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</li>
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<li>LLVM supports the Win32 dllimport/dllexport linkage and
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stdcall/fastcall calling conventions.</li>
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<li></li>
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</ul>
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</div>
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@ -179,51 +126,15 @@ LLVM 1.9:</p>
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<!--_________________________________________________________________________-->
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<div class="doc_subsubsection"><a name="other">Other Improvements</a></div>
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<div class="doc_text">
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<p>This release includes many other improvements, including improvements to
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the optimizers and code generators (improving the generated code) changes to
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speed up the compiler in many ways (improving algorithms and fine tuning
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code), and changes to reduce the code size of the compiler itself.</p>
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<p></p>
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<p>More specific changes include:</p>
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<ul>
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<li>The llvm-test framework now supports SPEC2006.</li>
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<li>LLVM now includes a <a href="GetElementPtr.html">FAQ about the
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<tt>getelementptr</tt> instruction</a>.</li>
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<li>Bugpoint now supports a new "<tt>-find-bugs</tt>" mode. This mode makes
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bugpoint permute pass sequences to try to expose bugs due to pass
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sequencing.</li>
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<li>The JIT now supports lazily streaming code from multiple modules at a
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time, implicitly linking the code as it goes.</li>
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<li></li>
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</ul>
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</div>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="apichanges">Significant API Changes in LLVM 1.9</a>
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</div>
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<div class="doc_text">
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<p>Several significant API changes have been made. If you are maintaining
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out-of-tree code, please be aware that:</p>
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<ul>
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<li>The ConstantSInt and ConstantUInt classes have been merged into the
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ConstantInt class.</li>
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<li><p>As a step towards making LLVM's integer types signless, several new
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instructions have been added to LLVM. The <tt>Div</tt> instruction is now
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<tt>UDiv</tt>, <tt>SDiv</tt>, and <tt>FDiv</tt>. The <tt>Rem</tt> instruction
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is now <tt>URem</tt>, <tt>SRem</tt> and <tt>FRem</tt>. See the
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<a href="LangRef.html">Language Reference</a> for details on these new
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instructions.</p>
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<li><p><tt>ConstantBool::True</tt> and <tt>ConstantBool::False</tt> have been
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renamed to <tt>ConstantBool::getTrue()</tt> and
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<tt>ConstantBool::getFalse()</tt>.</p></li>
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<li>The 'analyze' tool has been merged into the 'opt' tool.</li>
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</ul>
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</div>
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<!-- *********************************************************************** -->
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@ -307,9 +218,7 @@ components, please contact us on the <a href="http://lists.cs.uiuc.edu/mailman/l
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<ul>
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<li>The X86 backend does not yet support <a href="http://llvm.org/PR879">inline
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assembly that uses the X86 floating point stack</a>. See the <a
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href="http://llvm.org/PR879">bug</a> for details on workarounds on
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Linux.</li>
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assembly that uses the X86 floating point stack</a>.</li>
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</ul>
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</div>
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@ -324,8 +233,6 @@ components, please contact us on the <a href="http://lists.cs.uiuc.edu/mailman/l
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<ul>
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<li><a href="http://llvm.org/PR642">PowerPC backend does not correctly
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implement ordered FP comparisons</a>.</li>
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<li>The 64-bit PowerPC backend is not fully stable. If you desire PPC64 support,
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please use mainline CVS LLVM, which has several important bug fixes.</li>
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</ul>
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</div>
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@ -415,6 +322,7 @@ programs.</li>
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<li>Defining vararg functions is not supported (but calling them is ok).</li>
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<li>The Itanium backend has bitrotted somewhat.</li>
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</ul>
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</div>
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