index on master: bf135f8 Merge pull request #502 from halide/split_rvar_bounds
On master: isnan
isnan
Disable const simplification
Fix Pull Request comments
Merge branch 'isnan' of https://github.com/pgec/Halide into pgec-isnan
Treat isnan more like an extern than an intrinsic

For uniformity with other similar math ops.

Also had to rename it to is_nan, because isnan is a macro on some platrforms.
Move is_nan_f64 to the double section for opencl
Merge branch 'pgec-isnan'
Merge branch 'master' of github.com:halide/Halide