"Hand-written Assembly code is ALWAYS faster and/or smaller than the equivalent compiled code, as long as the programmer understands the many intricate details of the CPU they are developing for. eg: I wrote both an optimized C function and an optimized Assembly function (using NEON SIMD instructions) to shrink an image by 4, and my Assembly code was 30x faster than my best C code! Even the best C compilers are still terrible at using SIMD acceleration, which is a feature that is available on most modern CPUs and can allow code to run between 4 to 50 times faster, and yet is rarely used properly! "


Texto completo:
http://www.shervinemami.info/armAssembly.html