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gcc - Whats the difference among cflgs sse options of -msse, -msse2 . . . The -m switched can be used in parallel, furthermore some of them are implied by the architecture or other switches For instance, if you build code for x86_64, -msse -msse2 is always enabled For code intended to run on your system you should choose -march=native, which will select what is available on your processor For instance, if you have a Sandy Bridge, this will enable -msse -msse2
gcc - Disabling -msse - Stack Overflow -msse activates the generation of SSE instructions All 64-bit processors (x86-64) have them, but some older 32-bit processors (IA-32) do not have these instructions This is the reason for GCC's default settings SSE instructions have to do with vector operations and floating-point Considering that opportunities for automatic vectorization are rare in general-purpose code, the only
cc: error: unrecognized command line option ‘-msse2’ You'll need to complete a few actions and gain 15 reputation points before being able to upvote Upvoting indicates when questions and answers are useful What's reputation and how do I get it? Instead, you can save this post to reference later
c++ - CPU Supports msse4_2, but Cannot Compile . . . - Stack Overflow Note this probably doesn't have anything to do with the processor you actually have Even if your CPU didn't support SSE4 2, in general it should work to compile code for a different set of processor features than the build machine has You wouldn't be able to run the program on that computer, but you can still compile it You'd be able to run the resulting executable if you copied it to
g++ - sse2 instruction set not enabled - Stack Overflow And yes, SSE1 2 intrinsic types like __m128i will only get defined when SSE is enabled, so error: ‘__m128i’ does not name a type is a clear sign that -msse wasn't enabled If using autoconf or something, maybe use this: configure CPPFLAGS="-O3 -march=native -fno-math-errno" If you have c files as well as cpp, set CFLAGS as well as CPPFLAGS
c++ - Is sse2 enabled by default in g++? - Stack Overflow Later version, present only in Pentium4 and the future AMD x86-64 chips supports double precision arithmetics too For the i386 compiler, you need to use -march=cpu-type, -msse or -msse2 switches to enable SSE extensions and make this option effective For the x86-64 compiler, these extensions are enabled by default