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start translating this into Engrish and organizing it.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65797 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
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@ -14,7 +14,7 @@
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<li><a href="#intro">Introduction</a></li>
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<li><a href="#subproj">Sub-project Status Update</a></li>
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<li><a href="#externalproj">External Projects Using LLVM 2.5</a></li>
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<li><a href="#whatsnew">What's New in LLVM?</a></li>
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<li><a href="#whatsnew">What's New in LLVM 2.5?</a></li>
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<li><a href="GettingStarted.html">Installation Instructions</a></li>
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<li><a href="#portability">Portability and Supported Platforms</a></li>
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<li><a href="#knownproblems">Known Problems</a></li>
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@ -64,6 +64,9 @@ current one. To see the release notes for a specific release, please see the
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interpreter + libffi
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postalloc scheduler: anti dependence breaking, hazard recognizer?
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initial support for debug line numbers when optimization enabled, not useful in
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2.5 but will be for 2.6.
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-->
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<!-- for announcement email:
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@ -123,7 +126,7 @@ list</a>.</p>
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<li>Precompiled header support is now implemented.</li>
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<li>Objective-C support is significantly improved beyond LLVM 2.4, supporting
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many features, such as Objective-C Garbage Collection.</li>
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<li>Many many bugs are fixed.</li>
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<li>Many many bugs are fixed and many features have been added.</li>
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</div>
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<!--=========================================================================-->
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@ -166,7 +169,7 @@ The <a href="http://vmkit.llvm.org/">VMKit project</a> is an implementation of
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a JVM and a CLI Virtual Machines (Microsoft .NET is an
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implementation of the CLI) using the Just-In-Time compiler of LLVM.</p>
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<p>Following LLVM 2.5, VMKit has its first release ? that you can find on its
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<p>Following LLVM 2.5, VMKit has its first release that you can find on its
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<a href="http://vmkit.llvm.org/releases/">webpage</a>. The release includes
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bug fixes, cleanup and new features. The major changes are:</p>
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@ -202,11 +205,8 @@ Spec JVM98 is 6x faster (performance gain of 83%).</li>
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<div class="doc_text">
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<p>
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http://pure-lang.googlecode.com/
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</p>
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<p>
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Pure is an algebraic/functional programming language based on term rewriting.
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<a href="http://pure-lang.googlecode.com/">Pure</a>
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is an algebraic/functional programming language based on term rewriting.
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Programs are collections of equations which are used to evaluate expressions in
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a symbolic fashion. Pure offers dynamic typing, eager and lazy evaluation,
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lexical closures, a hygienic macro system (also based on term rewriting),
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@ -231,16 +231,11 @@ it as a kind of functional scripting language for many application areas.
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<div class="doc_text">
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<p>
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http://www.dsource.org/projects/ldc
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</p>
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<p>
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I'd like to inform that the LDC project (LLVM D
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Compiler) is working with release 2.5 of LLVM. In fact we've required
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2.5 in our trunk since the release was branched.
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The improvements in 2.5 have fixed a lot of problems with LDC, more
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specifically the new inline asm constraints, better debug info
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support, general bugfixes :) and better x86-64 support have allowed
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<a href="http://www.dsource.org/projects/ldc">LDC</a> is an implementation of
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the D Programming Language using the LLVM optimizer and code generator.
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LDC project works great with the LLVM 2.5 release. General improvmenets in this
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cycle have included new inline asm constraint handling, better debug info
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support, general bugfixes, and better x86-64 support. This has allowed
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some major improvements in LDC, getting us much closer to being as
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fully featured as the original DMD compiler from DigitalMars.
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</p>
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@ -252,17 +247,16 @@ fully featured as the original DMD compiler from DigitalMars.
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</div>
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<div class="doc_text">
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<p>http://code.roadsend.com/rphp</p>
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<p>Roadsend PHP is using LLVM for code generation. This is an open source
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project.
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</p>
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<p><a href="http://code.roadsend.com/rphp">Roadsend PHP</a> (rphp) is an open
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source compiler for the PHP programming language that uses LLVM for its
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optimizer, JIT, and static compiler. This is a reimplementation of an earlier
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project that is now based on the LLVM.</p>
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</div>
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<!-- *********************************************************************** -->
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<div class="doc_section">
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<a name="whatsnew">What's New in LLVM?</a>
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<a name="whatsnew">What's New in LLVM 2.5?</a>
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</div>
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<!-- *********************************************************************** -->
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@ -284,73 +278,25 @@ in this section.
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<p>LLVM 2.5 includes several major new capabilities:</p>
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<ul>
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<li><p>The code generator now supports arbitrary precision integers.
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Types like <tt>i33</tt> have long been valid in the LLVM IR, but previously
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could only be used with the interpreter.
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Now IR using such types can be compiled to native code on all targets.
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All operations are supported if the integer is not bigger than twice the
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target machine word size.
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Simple operations like loads, stores and shifts by a constant amount are
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supported for integers of any size.
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</p></li>
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<li>LLVM 2.5 includes a brand new <a
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href="http://en.wikipedia.org/wiki/XCore">XCore</a> backend.</li>
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<!--
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Random stuff:
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<li>llvm-gcc now generally supports the GFortan front-end, and the precompiled
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release binaries now support Fortran, even on Mac OS/X.</li>
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Pure project: http://code.google.com/p/pure-lang/
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<li>CMake is now used by the <a href="GettingStartedVS.html">LLVM build process
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on Windows</a>. It automatically generates Visual Studio project files (and
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more) from a set of simple text files. This makes it much easier to
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maintain. In time, we'd like to standardize on CMake for everything.</li>
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<li>LLVM 2.5 now uses (and includes) Google Test for unit testing.</li>
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xcore backend!
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fortran on darwin!
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.ll parser rewrite, caret diags, better errors, less fragile (less likely to
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crash on strange things). No longer depends on flex/bison.
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GCC inliner off, llvm handles always-inline.
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cmake mature?
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x86 backend GS segment -> addr space 256 (r62980)
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nocapture
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addreadattrs pass renamed to functionattrs; now calculates nocapture
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memdep (used by GVN and memcpyopt) is faster / more aggressive.
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how to write a backend doc docs/WritingAnLLVMBackend.html
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fastisel + exception handling
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vector widening <3 x float> -> <4 x float>
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arm port improvements? arm jit encoding stuff, constant island support?
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JIT TLS support on x86-32 but not x86-64.
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mem2reg now faster on code with huge basic blocks
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stack protectors/stack canaries, -fstack-protector, controllable on a
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per-function basis with attributes.
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shufflevector is generalized to allow different shuffle mask width than its
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input vectors.
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loop optimizer improves floating point induction variables
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llvm/Analysis/DebugInfo.h classes, llvm-gcc and clang and codegen use them.
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DebugInfoBuilder gone.
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asmprinters seperate from targets for jits
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PBQP register allocator now supports register coalescing.
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JIT supports exceptions on linux/x86-64 and linux/x86-64.
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integer overflow intrinsics for [us](add/sub/mul). Supported on all targets,
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but only generates efficient code on x86.
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X86 backend now supports -disable-mmx.
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noalias attribute on return value indicates that function returns new memory
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(e.g. malloc).
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Jump threading more powerful: it is iterative, handles threading based on values
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with fully redundant and partially redundant loads.
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LSR improvements?
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ARM debug info support?
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unit test framework based on Google Test.
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vector shift support + X86 backend.
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x86 JIT now detects core i7 and atom, autoconfiguring itself appropriately.
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SROA is more aggressive about promoting unions.
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non-zero __builtin_return_address values on X86.
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x86-64 now uses red zone (unless -mno-red-zone option is specified).
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private linkage.
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llvm-gcc defaults to -fno-math-errno on all x86 targets.
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initial support for debug line numbers when optimization enabled, not useful in
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2.5 but will be for 2.6.
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-->
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<li>The LLVM native code generator now supports arbitrary precision integers.
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Types like <tt>i33</tt> have long been valid in the LLVM IR, but were previously
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only supported by the interpreter. Note that the C backend still does not
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support these.</li>
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<li>LLVM 2.5 no longer uses 'bison', so it is easier to build on Windows.</li>
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</ul>
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</div>
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@ -368,7 +314,18 @@ front-ends and driver with the LLVM optimizer and code generator. It currently
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includes support for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
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<ul>
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<li>?</li>
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<li>In this release, the GCC inliner is completely disabled. Previously the GCC
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inliner was used to handle always-inline functions and other cases. This caused
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problems with code size growth, and it is completely disabled in this
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release.</li>
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<li>llvm-gcc (and LLVM in general) now support code generation for stack
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canaries, which is an effective form of <a
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href="http://en.wikipedia.org/wiki/Stack-smashing_protection">buffer overflow
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protection</a>. llvm-gcc supports this with the <tt>-fstack-protector</tt>
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command line option (just like GCC). In LLVM IR, you can request code
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generation for stack canaries with function attributes.
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</li>
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</ul>
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</div>
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@ -376,14 +333,52 @@ includes support for the C, C++, Objective-C, Ada, and Fortran front-ends.</p>
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<!--=========================================================================-->
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<div class="doc_subsection">
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<a name="coreimprovements">LLVM Core Improvements</a>
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<a name="coreimprovements">LLVM IR and Core Improvements</a>
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</div>
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<div class="doc_text">
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<p>New features include:</p>
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<p>LLVM IR has several new features that are used by our existing front-ends and
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can be useful if you are writing a front-end for LLVM:</p>
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<ul>
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<li>?</li>
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<li>The <a href="LangRef.html#i_shufflevector">shufflevector</a> instruction
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has been generalized to allow different shuffle mask width than its input
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vectors. This allows you to use shufflevector to combine two
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"<4 x float>" vectors into a "<8 x float>" for example.</li>
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<li>LLVM IR now supports new intrinsics for computing and acting on <a
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href="LangRef.html#int_overflow">overflow of integer operations</a>. This allows
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efficient code generation for languages that must trap or throw an exception on
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overflow. While these intrinsics work on all targets, they only generate
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efficient code on X86 so far.</li>
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<li>LLVM IR now supports a new <a href="LangRef.html#linkage">private
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linkage</a> type to produce labels that are stripped by the assembler before it
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produces a .o file (thus they are invisible to the linker).</li>
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<li>LLVM IR supports two new attributes for better alias analysis. The <a
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href="LangRef.html#paramattrs">noalias</a> attribute can now be used on the
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return value of a function to indicate that it returns new memory (e.g.
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'malloc', 'calloc', etc).</li>
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<li>The new <a href="LangRef.html#paramattrs">nocapture</a> attribute can be
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used on pointer arguments to functions that access through but do not return the
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pointer in a data structure that out lives the call (e.g. 'strlen', 'memcpy',
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and many others). The simplifylibcalls pass applies these attributes to
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standard libc functions.</li>
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<li>The parser for ".ll" files in lib/AsmParser is now completely rewritten as a
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recursive descent parser. This parser produces better error messages (including
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caret diagnostics) is less fragile (less likely to crash on strange things) does
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not leak memory, is more efficient, and eliminates LLVM's last use of the
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'bison' tool.</li>
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<li>Debug information representation and manipulation internals have been
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consolidated to use a new set of classes in
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<tt>llvm/Analysis/DebugInfo.h</tt> classes. These routines are more
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efficient, robust, and extensible and replace the older mechanisms.
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llvm-gcc, clang, and the code generator now use them to create and process
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debug information.</li>
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</ul>
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@ -401,7 +396,22 @@ release includes a few major enhancements and additions to the optimizers:</p>
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<ul>
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<li>?</li>
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<li>The loop optimizer now improves floating point induction variables in
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several ways, including adding shadow induction variables to avoid
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"integer <-> floating point" conversions in loops when safe.</li>
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<li>The "-mem2reg" pass is now much faster on code with huge basic blocks.</li>
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<li>The "-jump-threading" pass is more powerful: it is iterative
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and handles threading based on values with fully and partially redundant
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loads.</li>
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<li>The "-memdep" memory dependence analysis pass (used by GVN and memcpyopt) is
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both faster and more aggressive.</li>
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<li>The "-scalarrepl" scalar replacement of aggregates pass is more aggressive
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about promoting unions to registers.</li>
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</li>
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</ul>
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@ -430,10 +440,40 @@ The old type legalizer is still available and will be used if
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</li>
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<li>?</li>
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how to write a backend doc docs/WritingAnLLVMBackend.html
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asmprinters seperate from targets for jits
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fastisel + exception handling
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vector widening <3 x float> -> <4 x float>
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PBQP register allocator now supports register coalescing.
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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="x86">X86-32 and X86-64 Target Improvements</a>
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</div>
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<div class="doc_text">
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<p>New features of the X86 target include:
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</p>
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<ul>
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non-zero __builtin_return_address values on X86.
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vector shift support + X86 backend.
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x86 JIT now detects core i7 and atom, autoconfiguring itself appropriately.
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x86-64 now uses red zone (unless -mno-red-zone option is specified).
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x86 backend GS segment -> addr space 256 (r62980)
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X86 backend now supports -disable-mmx.
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JIT supports exceptions on linux/x86-64 and linux/x86-64.
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JIT TLS support on x86-32 but not x86-64.
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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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@ -560,7 +600,7 @@ from the previous release.</p>
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<ul>
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<li>?</li>
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<li>llvm-gcc defaults to -fno-math-errno on all x86 targets.</li>
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</ul>
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@ -666,7 +706,7 @@ href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVMdev list</a>.</p>
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<a href="http://llvm.org/PR2257">bugs</a> due to lack of support for the
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'u' inline assembly constraint and X87 floating point inline assembly.</li>
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<li>The X86-64 backend does not yet support the LLVM IR instruction
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<tt>va_arg</tt>. Currently, the llvm-gcc front-end supports variadic
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<tt>va_arg</tt>. Currently, the llvm-gcc and front-ends support variadic
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argument constructs on X86-64 by lowering them manually.</li>
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</ul>
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Block a user