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https://www.phoronix.com/scan.php?page=news_item&px=NjM4Ng
Mar 11, 2008 · GCC 4.3.0 also has performance tuning for the Intel Core 2 and AMD Geode processors. In addition, there is now support for Intel's SSE4.1, and SSE4.2 instruction sets. There are many more changes, so be sure to check out the GCC 4.3 change-log. The release announcement on the GNU mailing list provides additional details.
https://gcc.gnu.org/gcc-4.3/changes.html
This support had been deprecated since GCC 4.0.0. Support for a number of older systems and recently unmaintained or untested target ports of GCC has been declared obsolete in GCC 4.3. Unless there is activity to revive them, the next release of GCC will have their sources permanently removed.
https://www.phoronix.com/forums/forum/software/programming-compilers/5163-gcc-4-3-0-released-w-sse4-support
Phoronix: GCC 4.3.0 Released w/ SSE4 Support GCC 4.2.0 was released less than a year ago, but arriving yesterday was the release of GCC 4.3.0. Version 4.3.0 of the GNU Compiler Collection has its middle-end integrated with the MPFR math library, experimental support for the forthcoming C++0x ISO standard, GCJ now uses the Eclipse Java Compiler for Java parsing, all Java 1.5 language features ...
https://software.intel.com/en-us/forums/intel-isa-extensions/topic/296903
The same examples, with g++ or gfortran 4.5, generate identical code with sse4.1 or sse 4.2 options. While the gcc/g++/gfortran use of sse4 code shows some consistent performance gains over sse3, sse4.1 isn't used in the same ways in my code samples by gcc and Intel compilers, with the exception of the _mm_set_ps, where both compilers shift to ...Author: Westmere
https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html
3.19.59 x86 Options. These ‘-m’ options are defined for the x86 family of computers.-march=cpu-type Generate instructions for the machine type cpu-type.In contrast to -mtune=cpu-type, which merely tunes the generated code for the specified cpu-type, -march=cpu-type allows GCC to generate code that may not run at all on processors other than the one indicated.
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