Writing a piece of C code such that compiler uses SSE4.1 instruction for generating assembly Code?

From what I've seen, compilers rarely ever generate SSE4.1 instructions. I've seen a few cases where it will use the insert/extract instructions to pack data But for the most part, if you want to use the SSE4.1 instructions, you need to do them explicitly using intrinsics: software.intel.com/sites/products/docume....

From what I've seen, compilers rarely ever generate SSE4.1 instructions. I've seen a few cases where it will use the insert/extract instructions to pack data. But for the most part, if you want to use the SSE4.1 instructions, you need to do them explicitly using intrinsics: software.intel.com/sites/products/docume....

I doubt GCC would emit SSE4.1 instructions that easily. But you could have a look at Intel SPMD Program Compiler: Under the SPMD model, the programmer writes a program that mostly appears to be a regular serial program, though the execution model is actually that a number of program instances execute in parallel on the hardware. (See a more detailed example that illustrates this concept.) ispc compiles a C-based SPMD programming language to run on the SIMD units of CPUs; it frequently provides a 3x or more speedup on CPUs with 4-wide SSE units, without any of the difficulty of writing intrinsics code.

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