GCC, LLVM Clang和Open编译器比较.doc

GCC , LLVM/Clang , AMD piler Benchmarks For those interested by last week's articles on the AMD Bulldozer benchmarks of the GCC, Open64, and LLVM/pilers and the FX-piler tuning , but curious to know how the new LLVM/Clang and pilers perform on other processors, here's some new test results. These tests are looking at GCC , LLVM/Clang -RC1, and AMD pilers on Intel Sandy Bridge and AMD Shanghai hardware. The first release candidate of GCC , LLVM/Clang RC1 , and AMD Open64 were tested on these two non-Bulldozer setups. The CFLAGS/CXXFLAGS set outside of each test's default flags were specifying the march/mtume option to native for taking advantage of each system's native features. GCC was built with --enable-checking=release and LLVM was built with --enable-optimized and --disable-assertions , to mirror release builds. The piler was using the 64-bit binary provided by AMD. All other testing remained at the respective defaults. The AMD Shanghai setup was a dual AMD Opteron 2384 quad-core (octal-core total) system with 4GB of RAM and a SATA HDD. The Intel Core i7 Sandy Bridge setup had an i7-2630QM (quad-core with Hyper Threading), 8GB of RAM, and a Super Talent SSD. Both systems were running Ubuntu (x86_64) with the Linux kernel. Results for Open64 on Sandy Bridge were not available since the AMD-piler failed to build working binaries for