[llvm-commits] Patch: Math Lib call optimization

[Duncan Sands]

Dear Weiming Zhao,

> Hence, this transformation will not result in precision loss.

is this a correct statement?  For example, if sin returns a result which is
correct to within two double precision ulps, and sinf to within two single
precision ulps, then float->double->sin->float will probably be correct to
one single precision ulp, so converting to use sinf loses precision.

Ciao, Duncan.