[all-commits] [llvm/llvm-project] 122044: [libc] Add implementation of difftime function.

[rtenneti-google via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 12204429f2f9e1ab47e3fcb7a2ec4a262c800818
      https://github.com/llvm/llvm-project/commit/12204429f2f9e1ab47e3fcb7a2ec4a262c800818
  Author: Raman Tenneti <rtenneti at google.com>
  Date:   2022-10-24 (Mon, 24 Oct 2022)

  Changed paths:
    M libc/config/linux/aarch64/entrypoints.txt
    M libc/config/linux/x86_64/entrypoints.txt
    M libc/docs/date_and_time.rst
    M libc/src/time/CMakeLists.txt
    A libc/src/time/difftime.cpp
    A libc/src/time/difftime.h
    M libc/test/src/time/CMakeLists.txt
    A libc/test/src/time/difftime_test.cpp

  Log Message:
  -----------
  [libc] Add implementation of difftime function.

The difftime function computes the difference between two calendar
times: time1 - time0 as per as per 7.27.2.2 section in
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2478.pdf.

  double difftime(time_t time1, time_t time0);

Tested:
Unit tests

Co-authored-by: Jeff Bailey <jeffbailey at google.com>

Reviewed By: jeffbailey

Differential Revision: https://reviews.llvm.org/D136631