Some functions did clobber the registers, thus nesting functions calls like fp64_mul(fp64_div(a,b),c) did not working correctly, when b or c where constants or variables.
Handcrafted 64-bit floating point routines for AVR/arduino microprocessors
Some functions did clobber the registers, thus nesting functions calls like fp64_mul(fp64_div(a,b),c) did not working correctly, when b or c where constants or variables.