trigonometric functions:
__rem_pio_large: is returning 2 bits enough?
__tan: 3rd arg semantics is probably not optimal
sinf,cosf: return sindf(-y) vs -sindf(y)?
__sin,__cos,..: z,w,.. -> x2,x4,.. so degree is easier to see
__rem_pio2*: rounding trick: simply use the low 32 bits of fn?
trigonometric functions:
__rem_pio_large: is returning 2 bits enough?
__tan: 3rd arg semantics is probably not optimal
sinf,cosf: return sindf(-y) vs -sindf(y)?
__sin,__cos,..: z,w,.. -> x2,x4,.. so degree is easier to see
__rem_pio2*: rounding trick: simply use the low 32 bits of fn?