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...e the asm instruction if the target supports it)? > - Is it possible to code a sqrt or sin in LLVM bitcode that will use the hardware instruction if it's compiled for a certain target? See the LLVM language reference for the list of supported intrinsics: http://llvm.org/docs/LangRef.html#int_libc -- Jean-Daniel

Hi, Lately, I have been wondering how a compiler like GCC or Clang implements builtin functions like sqrt, sin, and also more bit-specific things like bcmp and ffs. Originially, these were all deferred to the C library where they might still have a "backup implementation", but I don't understand why a compiler would choose the non-builtin version, as it should know its version is