[PATCH] D46987: [Fixed Point Arithmetic] Validation Test for Saturated Subtraction on Signed _Fracts

[Leonard Chan via Phabricator via cfe-commits]

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

This patch includes the logic for subtraction on saturated _Fract types and a test for thm.

- Also fixed incorrect minimum value for each _Fract type
- Getters for each fixed point min and max value for a given type
- Correction when casting from a fixed point to a float. If the fixed point data and sign bits do not take up the whole width of the integer (ie. has padding), we will need to either zero out the padding or extend the sign into the padding if it is negative to ensure the correct floating point value is produced after casting.

This is a child of https://reviews.llvm.org/D46986


Repository:
  rC Clang

https://reviews.llvm.org/D46987

Files:
  include/clang/AST/Type.h
  include/clang/Basic/FixedPoint.h.in
  lib/AST/Type.cpp
  lib/CodeGen/CGExprScalar.cpp
  test/Frontend/fixed_point_all_builtin_operations.c

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