2003-11-22 08:38:41 +08:00
< !DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
< html >
< head >
2004-11-19 02:38:58 +08:00
< meta http-equiv = "Content-Type" content = "text/html; charset=utf-8" >
2003-11-22 08:38:41 +08:00
< link rel = "stylesheet" href = "llvm.css" type = "text/css" >
2008-02-06 14:30:34 +08:00
< title > LLVM 2.2 Release Notes< / title >
2003-11-22 08:38:41 +08:00
< / head >
< body >
2008-02-06 14:30:34 +08:00
< div class = "doc_title" > LLVM 2.2 Release Notes< / div >
2003-10-02 12:57:28 +08:00
< ol >
2003-11-22 08:38:41 +08:00
< li > < a href = "#intro" > Introduction< / a > < / li >
< li > < a href = "#whatsnew" > What's New?< / a > < / li >
2004-05-01 06:17:12 +08:00
< li > < a href = "GettingStarted.html" > Installation Instructions< / a > < / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "#portability" > Portability and Supported Platforms< / a > < / li >
2003-10-02 12:57:28 +08:00
< li > < a href = "#knownproblems" > Known Problems< / a >
2003-11-22 08:38:41 +08:00
< li > < a href = "#additionalinfo" > Additional Information< / a > < / li >
2003-10-02 12:57:28 +08:00
< / ol >
2004-05-24 05:07:27 +08:00
< div class = "doc_author" >
2005-10-29 15:07:09 +08:00
< p > Written by the < a href = "http://llvm.org" > LLVM Team< / a > < p >
2003-11-22 08:38:41 +08:00
< / div >
2003-10-02 12:57:28 +08:00
2008-02-07 02:00:48 +08:00
< h1 > < font color = "red" > THIS IS A WORK IN PROGRESS FOR THE LLVM 2.2
RELEASE< /font< / h1 >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_section" >
< a name = "intro" > Introduction< / a >
< / div >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_text" >
< p > This document contains the release notes for the LLVM compiler
2008-02-06 14:30:34 +08:00
infrastructure, release 2.2. Here we describe the status of LLVM, including
2007-05-23 12:39:32 +08:00
major improvements from the previous release and any known problems. All LLVM
2007-05-09 12:58:11 +08:00
releases may be downloaded from the < a href = "http://llvm.org/releases/" > LLVM
2007-05-23 12:39:32 +08:00
releases web site< / a > .< / p >
2003-10-03 00:38:05 +08:00
2004-12-07 16:04:13 +08:00
< p > For more information about LLVM, including information about the latest
2005-10-29 15:07:09 +08:00
release, please check out the < a href = "http://llvm.org/" > main LLVM
2003-10-08 05:38:31 +08:00
web site< / a > . If you have questions or comments, the < a
href="http://mail.cs.uiuc.edu/mailman/listinfo/llvmdev">LLVM developer's mailing
2003-11-22 08:38:41 +08:00
list< / a > is a good place to send them.< / p >
2003-10-02 12:57:28 +08:00
2007-07-09 16:04:31 +08:00
< p > Note that if you are reading this file from a Subversion checkout or the
2007-09-21 11:54:09 +08:00
main LLVM web page, this document applies to the < i > next< / i > release, not the
current one. To see the release notes for a specific releases, please see the
< a href = "http://llvm.org/releases/" > releases page< / a > .< / p >
2003-11-22 08:38:41 +08:00
< / div >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_section" >
< a name = "whatsnew" > What's New?< / a >
< / div >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_text" >
2008-02-06 14:30:34 +08:00
< p > This is the thirteenth public release of the LLVM Compiler Infrastructure.
It includes many features and refinements from LLVM 2.1.< / p >
2003-12-07 04:22:41 +08:00
2004-05-24 12:50:25 +08:00
< / div >
2003-12-07 04:22:41 +08:00
<!-- ========================================================================= -->
2005-05-15 13:44:51 +08:00
< div class = "doc_subsection" >
2008-02-06 14:30:34 +08:00
< a name = "frontends" > llvm-gcc 4.0, llvm-gcc 4.2, and clang< / a >
2006-04-18 14:18:36 +08:00
< / div >
2007-05-14 14:56:09 +08:00
< div class = "doc_text" >
2008-02-06 14:30:34 +08:00
< p > LLVM 2.2 fully supports both the llvm-gcc 4.0 and llvm-gcc 4.2 front-ends (in
LLVM 2.1, llvm-gcc 4.2 was beta). Since LLVM 2.1, the llvm-gcc 4.2 front-end
has made leaps and bounds and is now at least as good as 4.0 in virtually every
area, and is better in several areas (for example, exception handling
correctness). We strongly recommend that you migrate from llvm-gcc 4.0 to
llvm-gcc 4.2 in this release cycle because < b > LLVM 2.2 is the last release
that will support llvm-gcc 4.0< / b > : LLVM 2.3 will only support the llvm-gcc
4.2 front-end.< / p >
2007-05-17 07:25:46 +08:00
2008-02-07 02:00:06 +08:00
< p > The < a href = "http://clang.llvm.org/" > clang project< / a > is an effort to build
a set of new 'llvm native' front-end technologies for the LLVM optimizer
and code generator. Currently, its C and Objective-C support is maturing
nicely, and it has advanced source-to-source analysis and transformation
capabilities. If you are interested in building source-level tools for C and
Objective-C (and eventually C++), you should take a look. However, note that
clang is not an official part of the LLVM 2.2 release. If you are interested in
this project, please see the web site.< / p >
< / div >
<!-- ========================================================================= -->
< div class = "doc_subsection" >
< a name = "majorfeatures" > Major New Features< / a >
< / div >
< div class = "doc_text" >
< p > Dale contributed full support for long double on x86/x86-64 (where it is 80
bits) and on Darwin PPC/PPC64 (where it is 128 bits).< / p >
< p > Ada, gfortran< / p >
< p >
debug improvements -O0
Gordon: GC Revamp. docs/GarbageCollection.html
2008-02-10 06:58:07 +08:00
Kaleidoscope: docs/tutorial
2008-02-07 02:00:06 +08:00
Gordon: C and Ocaml Bindings
2007-05-18 14:33:02 +08:00
2008-02-10 06:58:07 +08:00
Christopher Lamb: Multiple address spaces.
2007-05-14 14:56:09 +08:00
< / div >
2007-09-21 11:54:09 +08:00
<!-- ========================================================================= -->
< div class = "doc_subsection" >
< a name = "optimizer" > Optimizer Improvements< / a >
< / div >
2007-05-14 14:56:09 +08:00
< div class = "doc_text" >
2007-09-26 13:44:21 +08:00
< p > Some of the most noticable feature improvements this release have been in the
optimizer, speeding it up and making it more aggressive. For example:< / p >
2007-05-17 07:25:46 +08:00
2007-09-21 11:54:09 +08:00
< ul >
2007-05-17 07:25:46 +08:00
2008-02-10 06:58:07 +08:00
< li > Daniel Berlin and Curtis Dunham rewrote Andersen's alias analysis (which is
not enabled by default) to be several orders of magnitude faster, implemented
Offline Variable Substitution.< / li >
2008-02-07 02:00:06 +08:00
Devang: LoopIndexSplit is enabled by default.
2008-02-10 06:58:07 +08:00
Dan Gohman: LSR improvements for SSE intrinsics and
Evan added simple exit value substitution to LSR.
Anton added readnone/readonly attributes for modelling GCC pure/const
attributes.
2007-05-14 14:56:09 +08:00
< / ul >
2007-09-21 11:54:09 +08:00
2007-05-14 14:56:09 +08:00
< / div >
2007-09-21 11:54:09 +08:00
<!-- ========================================================================= -->
< div class = "doc_subsection" >
< a name = "codegen" > Code Generator Improvements< / a >
< / div >
2007-05-18 14:33:02 +08:00
2006-04-18 14:18:36 +08:00
< div class = "doc_text" >
2007-09-21 11:54:09 +08:00
2008-02-07 02:00:06 +08:00
< p > foci of this release was performance tuning and bug
2007-09-26 13:44:21 +08:00
fixing. In addition to these, several new major changes occurred:< / p >
2006-11-18 15:51:14 +08:00
< ul >
2007-05-17 07:25:46 +08:00
2008-02-07 02:32:06 +08:00
< li > Owen contributed Machine Loop info, domintors, etc. Merged dom and
postdom.< / li >
2007-05-17 07:25:46 +08:00
2008-02-07 02:00:06 +08:00
< li > Dan added support for emitting debug information with .file and .loc on
targets that support it< / li >
< li > Evan physical register dependencies in the BURR scheduler< / li >
2008-02-07 02:32:06 +08:00
< li > Evan EXTRACT_SUBREG coalescing support< / li >
2008-02-10 06:58:07 +08:00
< li > Evan enhanced LSR to support induction variable reuse when the induction
variables have different widths.< / li >
< li > Rafael Espindola byval support, finished by Evan.< / li >
< li > mod/ref info for machineinstrs< / li >
< li > Evan: Live interval splitting on MBB boundaries.< / li >
2006-11-18 15:51:14 +08:00
< / ul >
2007-09-21 11:54:09 +08:00
2006-04-18 14:18:36 +08:00
< / div >
2007-09-21 11:54:09 +08:00
<!-- ========================================================================= -->
< div class = "doc_subsection" >
< a name = "targetspecific" > Target Specific Improvements< / a >
< / div >
2006-11-18 15:51:14 +08:00
2006-04-18 14:18:36 +08:00
< div class = "doc_text" >
2007-09-21 11:54:09 +08:00
< p > New features include:
2006-11-18 15:51:14 +08:00
< / p >
< ul >
2008-02-07 02:00:06 +08:00
< li > Evan X86 now models EFLAGS in instructions.< / li >
< li > Evan: If conversion on by default for ARM.< / li >
2008-02-07 02:32:06 +08:00
< li > Bruno: MIPS PIC support.< / li >
< li > Arnold Schwaighofer: X86 tail call support.< / li >
2008-02-10 06:58:07 +08:00
< li > Dale darwin/x86-64 and darwin/ppc eh< / li >
< li > Evan: darwin/x86 debug info< / li >
2007-09-21 11:54:09 +08:00
< / ul >
< / div >
2007-05-17 07:25:46 +08:00
2007-09-21 11:54:09 +08:00
<!-- ========================================================================= -->
< div class = "doc_subsection" >
< a name = "llvmgccimprovements" > llvm-gcc Improvements< / a >
< / div >
2006-11-18 15:51:14 +08:00
2007-09-21 11:54:09 +08:00
< div class = "doc_text" >
< p > New features include:
2007-05-18 14:33:02 +08:00
< / p >
< ul >
2008-02-06 14:30:34 +08:00
< li > .< / li >
2007-05-18 14:33:02 +08:00
< / ul >
2007-09-21 11:54:09 +08:00
< / div >
2007-05-18 14:33:02 +08:00
2006-11-18 15:51:14 +08:00
2007-09-21 11:54:09 +08:00
<!-- ========================================================================= -->
< div class = "doc_subsection" >
< a name = "coreimprovements" > LLVM Core Improvements< / a >
2006-04-18 14:18:36 +08:00
< / div >
2007-05-14 14:56:09 +08:00
< div class = "doc_text" >
2007-09-21 11:54:09 +08:00
< p > New features include:
2007-05-14 14:56:09 +08:00
< / p >
< ul >
2008-02-07 02:32:06 +08:00
< li > Devang added LLVMFoldingBuilder.< / li >
< li > Dan added support for vector sin, cos, and pow intrinsics.< / li >
2008-02-10 06:58:07 +08:00
< li > Ted added a framework for generic object serialization to bitcode files,
only used by clang right now for ASTs but could be used for other
stuff.< / li >
< li > Duncan fixed TargetData to distinguish between the size/alignment of a type
in a register, in memory according to the platform ABI, and in memory when
we have a choice.< / li >
2007-05-17 07:25:46 +08:00
< / ul >
2007-09-21 11:54:09 +08:00
2007-05-14 14:56:09 +08:00
< / div >
2007-09-21 11:54:09 +08:00
<!-- ========================================================================= -->
< div class = "doc_subsection" >
< a name = "otherimprovements" > Other Improvements< / a >
< / div >
2007-05-14 14:56:09 +08:00
2006-04-18 14:32:08 +08:00
< div class = "doc_text" >
2007-09-21 11:54:09 +08:00
< p > New features include:
< / p >
2006-04-18 14:18:36 +08:00
2006-02-05 14:39:36 +08:00
< ul >
2008-02-10 06:58:07 +08:00
< li > Gordon Henriksen updated docs/Passes.html< / li >
< li > New lexer and parser for tblgen, new lexer for asmparser< / li >
2007-05-18 05:41:31 +08:00
< / ul >
2007-09-21 11:54:09 +08:00
2007-05-18 05:41:31 +08:00
< / div >
2006-03-03 08:34:26 +08:00
2003-10-03 00:38:05 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_section" >
< a name = "portability" > Portability and Supported Platforms< / a >
< / div >
2003-10-03 00:38:05 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_text" >
2004-12-09 04:35:47 +08:00
< p > LLVM is known to work on the following platforms:< / p >
2004-06-02 02:22:41 +08:00
< ul >
2007-05-23 12:39:32 +08:00
< li > Intel and AMD machines running Red Hat Linux, Fedora Core and FreeBSD
2005-05-17 10:47:27 +08:00
(and probably other unix-like systems).< / li >
2008-02-06 14:30:34 +08:00
< li > PowerPC and X86-based Mac OS X systems, running 10.3 and above in 32-bit and
2007-05-23 12:39:32 +08:00
64-bit modes.< / li >
2008-02-07 02:00:06 +08:00
< li > Intel and AMD machines running on Win32 using MinGW libraries (native).< / li >
2004-12-07 16:04:13 +08:00
< li > Intel and AMD machines running on Win32 with the Cygwin libraries (limited
support is available for native builds with Visual C++).< / li >
2007-05-23 12:39:32 +08:00
< li > Sun UltraSPARC workstations running Solaris 8.< / li >
2005-05-14 04:28:15 +08:00
< li > Alpha-based machines running Debian GNU/Linux.< / li >
< li > Itanium-based machines running Linux and HP-UX.< / li >
2004-06-02 02:22:41 +08:00
< / ul >
2004-05-09 13:28:35 +08:00
< p > The core LLVM infrastructure uses
< a href = "http://www.gnu.org/software/autoconf/" > GNU autoconf< / a > to adapt itself
to the machine and operating system on which it is built. However, minor
porting may be required to get LLVM to work on new platforms. We welcome your
portability patches and reports of successful builds or error messages.< / p >
2003-10-02 12:57:28 +08:00
2003-11-22 08:38:41 +08:00
< / div >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_section" >
< a name = "knownproblems" > Known Problems< / a >
< / div >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_text" >
< p > This section contains all known problems with the LLVM system, listed by
2003-10-02 12:57:28 +08:00
component. As new problems are discovered, they will be added to these
2003-12-13 05:22:16 +08:00
sections. If you run into a problem, please check the < a
2005-10-29 15:07:09 +08:00
href="http://llvm.org/bugs/">LLVM bug database< / a > and submit a bug if
2003-12-13 05:22:16 +08:00
there isn't already one.< / p >
2003-10-02 12:57:28 +08:00
2003-11-22 08:38:41 +08:00
< / div >
2003-10-02 12:57:28 +08:00
2004-03-14 10:03:02 +08:00
<!-- ======================================================================= -->
< div class = "doc_subsection" >
< a name = "experimental" > Experimental features included with this release< / a >
< / div >
2003-10-02 12:57:28 +08:00
2004-03-14 10:03:02 +08:00
< div class = "doc_text" >
2004-05-13 05:46:05 +08:00
< p > The following components of this LLVM release are either untested, known to
be broken or unreliable, or are in early development. These components should
not be relied on, and bugs should not be filed against them, but they may be
useful to some people. In particular, if you would like to work on one of these
2006-08-09 12:08:52 +08:00
components, please contact us on the < a href = "http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev" > LLVMdev list< / a > .< / p >
2004-03-14 10:03:02 +08:00
< ul >
2008-02-07 02:00:06 +08:00
< li > The < tt > -cee< / tt > pass is known to be buggy and will be removed in
LLVM 2.3.< / li >
2008-02-06 14:30:34 +08:00
< li > The MSIL, IA64, Alpha, and MIPS backends are experimental.< / li >
< li > The LLC "< tt > -filetype=asm< / tt > " (the default) is the only supported
value for this option.< / li >
< li > The llvmc tool is not supported.< / li >
2004-03-14 10:03:02 +08:00
< / ul >
< / div >
2003-10-02 12:57:28 +08:00
2005-11-09 05:11:33 +08:00
<!-- ======================================================================= -->
< div class = "doc_subsection" >
2006-11-18 15:51:14 +08:00
< a name = "x86-be" > Known problems with the X86 back-end< / a >
< / div >
< div class = "doc_text" >
< ul >
< li > The X86 backend does not yet support < a href = "http://llvm.org/PR879" > inline
2007-05-09 12:58:11 +08:00
assembly that uses the X86 floating point stack< / a > .< / li >
2007-09-26 14:01:35 +08:00
< li > The X86 backend occasionally has < a href = "http://llvm.org/PR1649" > alignment
problems< / a > on operating systems that don't require 16-byte stack alignment
(including most non-darwin OS's like linux).< / li >
2006-11-18 15:51:14 +08:00
< / ul >
< / div >
<!-- ======================================================================= -->
< div class = "doc_subsection" >
< a name = "ppc-be" > Known problems with the PowerPC back-end< / a >
< / div >
< div class = "doc_text" >
< ul >
2007-05-15 17:21:28 +08:00
< li > The Linux PPC32/ABI support needs testing for the interpreter and static
2007-05-23 12:39:32 +08:00
compilation, and lacks support for debug information.< / li >
2006-11-18 15:51:14 +08:00
< / ul >
< / div >
<!-- ======================================================================= -->
< div class = "doc_subsection" >
2007-05-14 14:56:09 +08:00
< a name = "arm-be" > Known problems with the ARM back-end< / a >
2006-11-18 15:51:14 +08:00
< / div >
< div class = "doc_text" >
< ul >
2007-05-23 12:39:32 +08:00
< li > Thumb mode works only on ARMv6 or higher processors. On sub-ARMv6
2007-09-26 23:59:54 +08:00
processors, thumb programs can crash or produce wrong
2007-05-23 12:39:32 +08:00
results (< a href = "http://llvm.org/PR1388" > PR1388< / a > ).< / li >
2007-05-14 14:56:09 +08:00
< li > Compilation for ARM Linux OABI (old ABI) is supported, but not fully tested.
< / li >
2007-05-23 12:39:32 +08:00
< li > There is a bug in QEMU-ARM (< = 0.9.0) which causes it to incorrectly execute
programs compiled with LLVM. Please use more recent versions of QEMU.< / li >
2006-11-18 15:51:14 +08:00
< / ul >
< / div >
<!-- ======================================================================= -->
< div class = "doc_subsection" >
2007-05-14 14:56:09 +08:00
< a name = "sparc-be" > Known problems with the SPARC back-end< / a >
2006-11-18 15:51:14 +08:00
< / div >
< div class = "doc_text" >
< ul >
2007-05-14 14:56:09 +08:00
< li > The SPARC backend only supports the 32-bit SPARC ABI (-m32), it does not
support the 64-bit SPARC ABI (-m64).< / li >
2006-11-18 15:51:14 +08:00
< / ul >
< / div >
<!-- ======================================================================= -->
< div class = "doc_subsection" >
< a name = "alpha-be" > Known problems with the Alpha back-end< / a >
2005-11-09 05:11:33 +08:00
< / div >
< div class = "doc_text" >
< ul >
2006-11-18 15:51:14 +08:00
< li > On 21164s, some rare FP arithmetic sequences which may trap do not have the
appropriate nops inserted to ensure restartability.< / li >
< / ul >
< / div >
<!-- ======================================================================= -->
< div class = "doc_subsection" >
< a name = "ia64-be" > Known problems with the IA64 back-end< / a >
< / div >
< div class = "doc_text" >
< ul >
< li > C++ programs are likely to fail on IA64, as calls to < tt > setjmp< / tt > are
made where the argument is not 16-byte aligned, as required on IA64. (Strictly
speaking this is not a bug in the IA64 back-end; it will also be encountered
when building C++ programs using the C back-end.)< / li >
< li > The C++ front-end does not use < a href = "http://llvm.org/PR406" > IA64
ABI compliant layout of v-tables< / a > . In particular, it just stores function
pointers instead of function descriptors in the vtable. This bug prevents
mixing C++ code compiled with LLVM with C++ objects compiled by other C++
compilers.< / li >
< li > There are a few ABI violations which will lead to problems when mixing LLVM
output with code built with other compilers, particularly for floating-point
programs.< / li >
< li > Defining vararg functions is not supported (but calling them is ok).< / li >
2007-05-09 12:58:11 +08:00
< li > The Itanium backend has bitrotted somewhat.< / li >
2005-11-09 05:11:33 +08:00
< / ul >
2006-11-18 15:51:14 +08:00
2005-11-09 05:11:33 +08:00
< / div >
2006-11-18 15:51:14 +08:00
<!-- ======================================================================= -->
< div class = "doc_subsection" >
2007-05-14 14:56:09 +08:00
< a name = "c-be" > Known problems with the C back-end< / a >
2006-11-18 15:51:14 +08:00
< / div >
< div class = "doc_text" >
< ul >
2007-05-14 14:56:09 +08:00
< li > < a href = "http://llvm.org/PR802" > The C backend does not support inline
assembly code< / a > .< / li >
2007-09-26 14:01:35 +08:00
< li > < a href = "http://llvm.org/PR1126" > The C backend does not support vectors
yet< / a > .< / li >
< li > < a href = "http://llvm.org/PR1658" > The C backend violates the ABI of common
C++ programs< / a > , preventing intermixing between C++ compiled by the CBE and
C++ code compiled with LLC or native compilers.< / li >
2006-11-18 15:51:14 +08:00
< / ul >
< / div >
2005-11-09 05:11:33 +08:00
2003-11-22 08:38:41 +08:00
<!-- ======================================================================= -->
< div class = "doc_subsection" >
< a name = "c-fe" > Known problems with the C front-end< / a >
< / div >
2003-10-02 13:07:23 +08:00
2003-10-02 12:57:28 +08:00
<!-- _______________________________________________________________________ -->
2003-12-14 13:03:43 +08:00
< div class = "doc_subsubsection" > Bugs< / div >
2003-11-22 08:38:41 +08:00
< div class = "doc_text" >
2006-03-03 08:34:26 +08:00
2008-02-07 02:00:06 +08:00
< p > llvm-gcc does not currently support < a href = "http://llvm.org/PR869" > Link-Time
Optimization< / a > on most platforms "out-of-the-box". Please inquire on the
2007-05-14 14:56:09 +08:00
llvmdev mailing list if you are interested.< / p >
2006-11-18 15:51:14 +08:00
2003-11-22 08:38:41 +08:00
< / div >
2003-10-28 02:30:37 +08:00
2003-11-22 08:38:41 +08:00
<!-- _______________________________________________________________________ -->
< div class = "doc_subsubsection" >
Notes
< / div >
< div class = "doc_text" >
< ul >
2007-05-18 06:02:24 +08:00
< li > < p > llvm-gcc does < b > not< / b > support < tt > __builtin_apply< / tt > yet.
See < a href = "http://gcc.gnu.org/onlinedocs/gcc/Constructing-Calls.html#Constructing%20Calls" > Constructing Calls< / a > : Dispatching a call to another function.< / p >
< / li >
2003-10-02 12:57:28 +08:00
2007-05-18 17:04:20 +08:00
< li > < p > llvm-gcc < b > partially< / b > supports these GCC extensions:< / p >
2003-10-02 12:57:28 +08:00
< ol >
2007-09-26 23:59:54 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Nested-Functions.html#Nested%20Functions" > Nested Functions< / a > :
As in Algol and Pascal, lexical scoping of functions.
Nested functions are supported, but llvm-gcc does not support
2007-09-27 00:24:52 +08:00
taking the address of a nested function (except on the X86-32 target)
2007-09-26 23:59:54 +08:00
or non-local gotos.< / li >
2003-10-02 12:57:28 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html#Function%20Attributes" > Function Attributes< / a > :
2003-11-22 08:38:41 +08:00
2003-12-19 00:43:17 +08:00
Declaring that functions have no side effects or that they can never
2003-11-22 08:38:41 +08:00
return.< br >
2007-11-16 19:12:01 +08:00
< b > Supported:< / b > < tt > alias< / tt > , < tt > always_inline< / tt > , < tt > cdecl< / tt > ,
< tt > const< / tt > , < tt > constructor< / tt > , < tt > destructor< / tt > ,
2006-11-18 16:04:48 +08:00
< tt > deprecated< / tt > , < tt > fastcall< / tt > , < tt > format< / tt > ,
2007-11-16 19:12:01 +08:00
< tt > format_arg< / tt > , < tt > non_null< / tt > , < tt > noinline< / tt > ,
< tt > noreturn< / tt > , < tt > pure< / tt > , < tt > regparm< / tt >
2007-01-23 20:35:46 +08:00
< tt > section< / tt > , < tt > stdcall< / tt > , < tt > unused< / tt > , < tt > used< / tt > ,
< tt > visibility< / tt > , < tt > warn_unused_result< / tt > , < tt > weak< / tt > < br >
2003-11-22 08:38:41 +08:00
2007-11-16 19:12:01 +08:00
< b > Ignored:< / b > < tt > nothrow< / tt > , < tt > malloc< / tt > ,
< tt > no_instrument_function< / tt > < / li >
2003-11-22 08:38:41 +08:00
< / ol >
2007-05-18 06:02:24 +08:00
< / li >
2003-10-02 12:57:28 +08:00
2007-05-18 06:02:24 +08:00
< li > < p > llvm-gcc supports the vast majority of GCC extensions, including:< / p >
2003-10-02 12:57:28 +08:00
2003-11-22 08:38:41 +08:00
< ol >
2007-05-18 06:02:24 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Pragmas.html#Pragmas" > Pragmas< / a > : Pragmas accepted by GCC.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Local-Labels.html#Local%20Labels" > Local Labels< / a > : Labels local to a block.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#Other%20Builtins" > Other Builtins< / a > :
Other built-in functions.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Variable-Attributes.html#Variable%20Attributes" > Variable Attributes< / a > :
Specifying attributes of variables.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Type-Attributes.html#Type%20Attributes" > Type Attributes< / a > : Specifying attributes of types.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Thread_002dLocal.html" > Thread-Local< / a > : Per-thread variables.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Variable-Length.html#Variable%20Length" > Variable Length< / a > :
Arrays whose length is computed at run time.< / li >
2004-03-16 16:54:07 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html#Labels%20as%20Values" > Labels as Values< / a > : Getting pointers to labels and computed gotos.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html#Statement%20Exprs" > Statement Exprs< / a > : Putting statements and declarations inside expressions.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Typeof.html#Typeof" > Typeof< / a > : < code > typeof< / code > : referring to the type of an expression.< / li >
2004-06-22 11:48:17 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Lvalues.html#Lvalues" > Lvalues< / a > : Using < code > ?:< / code > , "< code > ,< / code > " and casts in lvalues.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Conditionals.html#Conditionals" > Conditionals< / a > : Omitting the middle operand of a < code > ?:< / code > expression.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Long-Long.html#Long%20Long" > Long Long< / a > : Double-word integers.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Complex.html#Complex" > Complex< / a > : Data types for complex numbers.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Hex-Floats.html#Hex%20Floats" > Hex Floats< / a > :Hexadecimal floating-point constants.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html#Zero%20Length" > Zero Length< / a > : Zero-length arrays.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Empty-Structures.html#Empty%20Structures" > Empty Structures< / a > : Structures with no members.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Variadic-Macros.html#Variadic%20Macros" > Variadic Macros< / a > : Macros with a variable number of arguments.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Escaped-Newlines.html#Escaped%20Newlines" > Escaped Newlines< / a > : Slightly looser rules for escaped newlines.< / li >
2006-11-18 15:51:14 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Extended%20Asm" > Extended Asm< / a > : Assembler instructions with C expressions as operands.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Constraints.html#Constraints" > Constraints< / a > : Constraints for asm operands.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Asm-Labels.html#Asm%20Labels" > Asm Labels< / a > : Specifying the assembler name to use for a C symbol.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars" > Explicit Reg Vars< / a > : Defining variables residing in specified registers.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html#Vector%20Extensions" > Vector Extensions< / a > : Using vector instructions through built-in functions.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Target-Builtins.html#Target%20Builtins" > Target Builtins< / a > : Built-in functions specific to particular targets.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Subscripting.html#Subscripting" > Subscripting< / a > : Any array can be subscripted, even if not an lvalue.< / li >
2003-12-12 12:37:31 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Pointer-Arith.html#Pointer%20Arith" > Pointer Arith< / a > : Arithmetic on < code > void< / code > -pointers and function pointers.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Initializers.html#Initializers" > Initializers< / a > : Non-constant initializers.< / li >
2003-12-19 00:43:17 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Compound-Literals.html#Compound%20Literals" > Compound Literals< / a > : Compound literals give structures, unions,
or arrays as values.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html#Designated%20Inits" > Designated Inits< / a > : Labeling elements of initializers.< / li >
2003-12-12 12:37:31 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Cast-to-Union.html#Cast%20to%20Union" > Cast to Union< / a > : Casting to union type from any member of the union.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html#Case%20Ranges" > Case Ranges< / a > : `case 1 ... 9' and such.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Mixed-Declarations.html#Mixed%20Declarations" > Mixed Declarations< / a > : Mixing declarations and code.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Function-Prototypes.html#Function%20Prototypes" > Function Prototypes< / a > : Prototype declarations and old-style definitions.< / li >
2004-12-09 02:29:38 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/C_002b_002b-Comments.html#C_002b_002b-Comments" > C++ Comments< / a > : C++ comments are recognized.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Dollar-Signs.html#Dollar%20Signs" > Dollar Signs< / a > : Dollar sign is allowed in identifiers.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character%20Escapes" > Character Escapes< / a > : < code > \e< / code > stands for the character < ESC> .< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Alignment.html#Alignment" > Alignment< / a > : Inquiring about the alignment of a type or variable.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Inline.html#Inline" > Inline< / a > : Defining inline functions (as fast as macros).< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html#Alternate%20Keywords" > Alternate Keywords< / a > :< code > __const__< / code > , < code > __asm__< / code > , etc., for header files.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Incomplete-Enums.html#Incomplete%20Enums" > Incomplete Enums< / a > : < code > enum foo;< / code > , with details to follow.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Function-Names.html#Function%20Names" > Function Names< / a > : Printable strings which are the name of the current function.< / li >
2004-02-14 12:08:29 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Return-Address.html#Return%20Address" > Return Address< / a > : Getting the return or frame address of a function.< / li >
2003-11-22 08:38:41 +08:00
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Unnamed-Fields.html#Unnamed%20Fields" > Unnamed Fields< / a > : Unnamed struct/union fields within structs/unions.< / li >
< li > < a href = "http://gcc.gnu.org/onlinedocs/gcc/Attribute-Syntax.html#Attribute%20Syntax" > Attribute Syntax< / a > : Formal syntax for attributes.< / li >
2003-11-22 09:00:11 +08:00
< / ol > < / li >
< / ul >
2003-11-22 08:38:41 +08:00
< p > If you run into GCC extensions which have not been included in any of these
lists, please let us know (also including whether or not they work).< / p >
< / div >
<!-- ======================================================================= -->
< div class = "doc_subsection" >
< a name = "c++-fe" > Known problems with the C++ front-end< / a >
< / div >
< div class = "doc_text" >
2007-05-14 14:56:09 +08:00
< p > The C++ front-end is considered to be fully
2004-12-07 16:04:13 +08:00
tested and works for a number of non-trivial programs, including LLVM
2007-05-14 14:56:09 +08:00
itself, Qt, Mozilla, etc.< / p >
2003-10-02 12:57:28 +08:00
2003-11-22 08:38:41 +08:00
< ul >
2008-02-06 14:30:34 +08:00
< li > Exception handling only works well on the X86 and PowerPC targets.< / li >
2003-11-22 08:38:41 +08:00
< / ul >
2003-10-08 06:14:37 +08:00
2003-11-22 08:38:41 +08:00
< / div >
2003-10-08 06:14:37 +08:00
2006-04-18 14:18:36 +08:00
2005-05-16 00:01:20 +08:00
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_section" >
< a name = "additionalinfo" > Additional Information< / a >
< / div >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< div class = "doc_text" >
2005-05-17 01:13:10 +08:00
< p > A wide variety of additional information is available on the < a
2007-05-18 08:44:29 +08:00
href="http://llvm.org">LLVM web page< / a > , in particular in the < a
href="http://llvm.org/docs/">documentation< / a > section. The web page also
2007-07-09 16:04:31 +08:00
contains versions of the API documentation which is up-to-date with the
Subversion version of the source code.
2005-03-31 03:14:24 +08:00
You can access versions of these documents specific to this release by going
into the "< tt > llvm/doc/< / tt > " directory in the LLVM tree.< / p >
2003-10-02 12:57:28 +08:00
2003-11-22 08:38:41 +08:00
< p > If you have any questions or comments about LLVM, please feel free to contact
2005-10-29 15:07:09 +08:00
us via the < a href = "http://llvm.org/docs/#maillist" > mailing
2003-12-13 05:22:16 +08:00
lists< / a > .< / p >
2003-10-02 12:57:28 +08:00
2003-11-22 08:38:41 +08:00
< / div >
2003-10-02 12:57:28 +08:00
<!-- *********************************************************************** -->
2003-11-22 08:38:41 +08:00
< hr >
2003-11-22 09:23:39 +08:00
< address >
2003-12-22 06:53:21 +08:00
< a href = "http://jigsaw.w3.org/css-validator/check/referer" > < img
2003-11-22 09:23:39 +08:00
src="http://jigsaw.w3.org/css-validator/images/vcss" alt="Valid CSS!">< / a >
< a href = "http://validator.w3.org/check/referer" > < img
src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" />< / a >
2007-05-18 08:44:29 +08:00
< a href = "http://llvm.org/" > LLVM Compiler Infrastructure< / a > < br >
2003-11-22 08:38:41 +08:00
Last modified: $Date$
2003-11-22 09:23:39 +08:00
< / address >
2003-10-02 12:57:28 +08:00
2003-11-22 08:38:41 +08:00
< / body >
< / html >
