gcc-4.5-20111124 is now available
Snapshot gcc-4.5-2024 is now available on ftp://gcc.gnu.org/pub/gcc/snapshots/4.5-2024/ and on various mirrors, see http://gcc.gnu.org/mirrors.html for details. This snapshot has been generated from the GCC 4.5 SVN branch with the following options: svn://gcc.gnu.org/svn/gcc/branches/gcc-4_5-branch revision 181701 You'll find: gcc-4.5-20111124.tar.bz2 Complete GCC MD5=d5eac7e18b3d83f8a2a6a3604985b22e SHA1=be4b67ab6d2163cc850450bf5825a7a4cabe2327 Diffs from 4.5-2017 are available in the diffs/ subdirectory. When a particular snapshot is ready for public consumption the LATEST-4.5 link is updated and a message is sent to the gcc list. Please do not use a snapshot before it has been announced that way.
X32 project status update
Hi, This is the x32 project status update: https://sites.google.com/site/x32abi/ There are several changes: 1. We changed x32 kernel to use the 64bit filesystem interface (LFS) as well as 64bit time_t. We are targeting Linux kernel 3.3. 2. I backported x32 support to glibc 2.14, 2.13, 2.12 and 2.11. Since glibc 2.11 is the first x32 release now, the x32 minimum ABI is changed from GLIBC_2.14 to GLIBC_2.11, which require recompiling all existing x32 binaries. 3. I am implementing address-size override: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50797 The result shows that it can improve SPEC CPU performance by another 5% over the current x32 implementation. I am putting this on hjl/x32/addr32 branch at http://gcc.gnu.org/git/?p=gcc.git;a=summary I also backported it to GCC 4.6 on hjl/x32/gcc-4_6-branch branch. -- H.J.
Re: Auto-Vectorization, Polyhedral Model
Hello, I am also interested in working on polyhedral model guided auto-vectorization. I went through the paper "Polyhedral-Model Guided Loop-Nest Auto-Vectorization", that you suggested. Does it use the GCC auto-vectorization algorithm to rewrite scalar instructions into vector instructions? Anywhere I can find the implementation prototype that you are talking about? Regards, Umesh B. >Hi, > >Auto-Vectorization is still implemented in the 'old'- non polyhedral way. >Polyhedral model can only help drive the vectorization strategies. >What is happening is that Graphite (polyhedral model framework inside GCC) >is setting the flag on the loop that it thinks should be vectorized. >Later, the vectorizer pass is performing the vectorization - by rewritting >scalar instructions into vector instructions. > >Please have a look at the paper "Polyhedral-Model Guided Loop-Nest >Auto-Vectorization". > >Konrad > > >2011/11/15 steven su : >> Hi, >> Can anyone explain whether GCC has implemented Auto-Vectorization >> based on Polyhedral Model? >> Are there any related projects shooting at this, and ?in progress? >> >> Steven. >>
