forked from OSchip/llvm-project
continue the process of detangling this.
llvm-svn: 101992
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Chris Lattner
parent
3ecc665505
commit
1dcca8bd5e
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@ -257,6 +257,11 @@ The first dragonegg release will occur shortly after llvm-2.7 is released.
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The LLVM Machine Code (MC) Toolkit project is ...
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</p>
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<p>
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MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
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Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
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</p>
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</div>
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@ -380,16 +385,22 @@ organization changes have happened:
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<ul>
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<li>LLVM has a new <a href="http://llvm.org/Logo.html">official Logo</a>!</li>
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<li><a href="http://llvm.org">llvm.org</a> is now hosted on a new (and much
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faster) server. It is still hosted as the University of Illinois.</li>
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<li>Ted Kremenek and Doug Gregor have stepped forward as <a
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href="http://llvm.org/docs/DeveloperPolicy.html#owners">Code Owners</a> of the
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Clang static analyzer and the Clang Frontend, respectively.</li>
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<li>LLVM now has an <a href="http://blog.llvm.org">official Blog</a> at
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<a href="http://blog.llvm.org">http://blog.llvm.org</a>. This is a great way
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to learn about new LLVM-related features as they are implemented. Several
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features in this release are already explained on the blog.</li>
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<li>The LLVM web pages are now checked into the SVN server, in the "www",
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"www-pubs" and "www-releases" SVN modules. Previously they were hidden in a
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largely inaccessible old CVS server.</p>
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<li><a href="http://llvm.org">llvm.org</a> is now hosted on a new (and much
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faster) server. It is still graciously hosted at the University of Illinois
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of Urbana Champaign.</li>
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</ul>
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</div>
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@ -403,25 +414,47 @@ faster) server. It is still hosted as the University of Illinois.</li>
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<p>LLVM 2.7 includes several major new capabilities:</p>
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<ul>
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<li>New MicroBlaze backend. http://en.wikipedia.org/wiki/MicroBlaze</li>
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<li>This release includes initial support for the <a
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href="http://en.wikipedia.org/wiki/MicroBlaze">MicroBlaze</a> target.
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MicroBlaze is a soft processor core designed for Xilinx FPGAs.</li>
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<li>Extensible metadata solid.</li>
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<li>LLVM 2.7 includes a new LLVM IR "extensible metadata" feature. This feature
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supports many different use cases, including allowing front-end authors to
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encode source level information into LLVM IR, which is consumed by later
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language-specific passes. This is a great way to do high-level optimizations
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like devirtualization, type-based alias analysis, etc. See the <a
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href="http://blog.llvm.org/2010/04/extensible-metadata-in-llvm-ir.html">
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Extensible Metadata Blog Post</a> for more information.</li>
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<li>Debug info improvements: using metadata instead of llvm.dbg global variables.
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This brings several enhancements including improved compile times.</li>
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<li>LLVM 2.7 encodes <a href="SourceLevelDebugging.html">debug information</a>
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in a completely new way, built on extensible metadata. The new implementation
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is much more memory efficient and paves the way for improvements to optimized
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code debugging experience.</li>
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<li>Indirect branch + address of label (blog post), particularly useful for
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interpreters.</li>
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<li>LLVM 2.7 now directly supports taking the address of a label and doing an
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indirect branch through a pointer. This is particularly useful for
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interpreter loops, and is used to implement the GCC "address of label"
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extension. For more information, see the <a
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href="http://blog.llvm.org/2010/01/address-of-label-and-indirect-branches.html">
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Address of Label and Indirect Branches in LLVM IR Blog Post</a>.
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<li>New instruction selector.</li>
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<li>LLVM 2.7 is the first release to start supporting APIs for assembling and
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disassembling target machine code. These APIs are useful for a variety of
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low level clients, and are surfaced in the new "enhanced disassembly" API.
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For more information see the <a
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href="http://blog.llvm.org/2010/01/x86-disassembler.html">The X86
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Disassembler Blog Post</a> for more information.</li>
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<li>LLVM 2.7 includes major parts of the work required by the new MC Project,
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which aims to rework our handling of low-level machine code. A few targets
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have been refactored to support it, and work is underway to support a native
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assembler in LLVM. This work is not complete in LLVM 2.7, but you has made
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substantially more progress on LLVM mainline. You can read more about this
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in the <a href="http://blog.llvm.org/2010/04/intro-to-llvm-mc-project.html">
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Intro to the LLVM MC Project Blog Post</a>.
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</li>
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</ul>
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libllvm2.7.so?? configure with --enable-shared
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MC encoding and disassembler apis.
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MC Disassembler (with blog post), MCInstPrinter. Many X86 backend and AsmPrinter simplifications
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Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1"
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</div>
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@ -435,12 +468,22 @@ Can transcode from GAS to intel syntax with "llvm-mc foo.s -output-asm-variant=1
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expose new optimization opportunities:</p>
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<ul>
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<li>New InlineHint and StackAlignment function attributes
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Half-float support in APFloat
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llvm.objectsize.
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New llvm/Support/Regex.h API. FileCheck now does regex's
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Pre-Alpha support for unions in IR.
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dbgs() and -debug-buffer-size=N
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<li>LLVM IR now supports a 16-bit "half float" data type through two new <a
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href="LangRef.html#int_fp16">intrinsics</a> and APFloat support.</li>
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<li>LLVM IR supports two <a href="LangRef.html#fnattrs">new function
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attributes</a>: inlinehint and alignstack(n). The former is a hint to the
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optimizer that a function was declared 'inline' and thus it might be useful
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to increase the chances the the inliner actually inline it. The later
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indicates to the code generator that the function diverges from the platform
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ABI on stack alignment.</li>
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<li>The new <a href="LangRef.html#int_objectsize">llvm.objectsize</a> intrinsic
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allows the optimizer to infer the sizes of memory objects in some cases.
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This intrinsic is used to implement the GCC __builtin_object_size
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extension.</li>
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<li>LLVM 2.7 has pre-alpha support for <a
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href="http://llvm.org/docs/LangRef.html#t_union">unions in LLVM IR</a>.
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Unfortuantely, this support is not really usable in 2.7, so if you're
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interested in pushing it forward, please help contribute to LLVM mainline.</li>
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</li>
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</ul>
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@ -524,6 +567,7 @@ infrastructure, which allows us to implement more aggressive algorithms and make
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it run faster:</p>
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<ul>
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<li>New instruction selector [blog post?].</li>
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Code generator MC'ized except for debug info and EH.
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@ -576,12 +620,21 @@ Many improvements to debug info
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<ul>
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<li>complete llvm-gcc NEON support.</li>
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<li>ARM/Thumb using reg scavenging for stack object address materialization
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(PEI).</li>
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<li>The ARM backend now has good support for ARMv4 backend (tested on StrongARM
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hardware), previously only supported ARMv4T and newer.</li>
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<li>ARM backend generates instructions in unified assembly syntax.</li>
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<li>The ARM backend now generates instructions in unified assembly syntax.</li>
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<li>llvm-gcc now has complete support for the ARM v7 NEON instruction set. This
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support differs slightly from the GCC implementation. Please see the
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<a
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href="http://blog.llvm.org/2010/04/arm-advanced-simd-neon-intrinsics-and.html">
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ARM Advanced SIMD (NEON) Intrinsics and Types in LLVM Blog Post</a> for
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helpful information if migrating code from GCC to LLVM-GCC.</li>
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<li>The ARM and Thumb code generators now using register scavenging for stack
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object address materialization.(FIXME: WHAT BENEFIT DOES THIS PROVIDE?)</li>
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<li>The ARM backend now has good support for ARMv4 targets, and has been tested
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on StrongARM hardware. Previously, LLVM only supported ARMv4T and
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newer chips.</li>
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</ul>
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@ -614,7 +667,16 @@ Many improvements to debug info
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</p>
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<ul>
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<li>...</li>
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<li>The llvm/Support/Regex.h header exposes a platform independent regular
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expression API. Building on this, the <a
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href="TestingGuide.html#FileCheck">FileCheck</a> utility now supports
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regular exressions.</li>
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<li>raw_ostream now supports a circular "debug stream" accessed with "dbgs()".
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By default, this stream works the same way as "errs()", but if you pass
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<tt>-debug-buffer-size=1000</tt> to opt, the debug stream is capped to a
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fixed sized circular buffer and the output is printed at the end of the
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program's execution. This is helpful if you have a long lived compiler
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process and you're interested in seeing snapshots in time.</li>
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</ul>
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@ -629,6 +691,9 @@ Many improvements to debug info
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<p>Other miscellaneous features include:</p>
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<ul>
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<li>You can now build LLVM as a big dynamic library (e.g. "libllvm2.7.so"). To
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get this, configure LLVM with the --enable-shared option.</li>
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<li>LLVM command line tools now overwrite their output by default, before they
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would only do this with -f. This makes them more convenient to use, and
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behave more like standard unix tools.</li>
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