Support for fixed point arithmetic in libc · Issue #74560 · llvm/llvm-project (original) (raw)

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Description

Clang supports fixed point arithmetic which was proposed in ISO/IEC JTC1 SC22 WG14 N1169. This document also proposes the stdfix.h header which introduces:

• Integer types used for the bits conversion functions
• Precision macros
• The FX_FULL_PRECISION pragma
• The fixed-point overflow pragmas
• Fixed-point arithmetic
  • The fixed-point arithmetic operation support functions
  • The fixed-point absolute value functions
  • The fixed-point rounding functions
  • The fixed-point countls functions
  • The bitwise fixed-point to integer conversion functions
  • The bitwise integer to fixed-point conversion functions
  • Type-generic fixed-point functions
  • Numeric conversion functions
• The fprintf function conversion specifiers for fixed-point type arguments
• The fscanf function conversion specifiers for fixed-point type arguments

To improve the usability of fixed point arithmetic in Clang, LLVM libc should provide the stdfix.h header and implement all the functions declared there.