ASM doesn't scale in structure (impossible to manage) and certainly not in architecture - for example new Intel Haswell's have vectorization opportunities which

ASM doesn't scale in structure (impossible to manage) and certainly not in architecture - for example new Intel Haswell's have vectorization opportunities which will cause any code that doesn't use these opcodes to run worse. Lastly, it is increasingly difficult to beat C/C++ in performance using handmade ASM, especially when comparing tight loop performance in handmade asm and intel icc - although maybe I suck. Web-client doesn't count in my anywhere because my browser doesn't run a compiled language. That being said backends are often written in C++. A frequently used paradigm is to see some glue language java, python, calling critical C++ routines that are exposed as a library.