title: Compiler-rt and gcc?
body: <p>As far as I understand, compiler-rt provides a list of target-specific software emulation for its respective hardware counterpart. For example, if a system doesn't have a double to double multiplication, than its respective software rountine will be called.</p>
  
  <p>My question is, how is this different from GCC standard library? How do use it for cross-compilation? Are compiler-rt software emulated functions more optimized than, lets say, using arm-gcc library functions for the same operation?</p>
  
  <p>Am I understanding this issue correctly?</p>