[PATCH] D47030: [Fixed Point Arithmetic] Checks for Precision Macros

[Leonard Chan via Phabricator via cfe-commits]

leonardchan created this revision.
leonardchan added reviewers: phosek, mcgrathr, jakehehrlich.
leonardchan added a project: clang.
Herald added a subscriber: mgorny.

This patch includes checks that the precision macros used for the fixed point fractional and integral bits meet the requirements for clause 6.2.6.3 in http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1169.pdf.

Checks for any disagreements with the recommendations will throw warnings.

I also added my own warning that recommends the integral and fractional bits for _Accum types take up the width of the whole underlying integer to prevent having to mask out the padding bits when performing comparisons.


Repository:
  rC Clang

https://reviews.llvm.org/D47030

Files:
  cmake/modules/InitFixedPointBits.cmake

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