[all-commits] [llvm/llvm-project] c43705: Reland "[APFloat] Add exp functions for single and...

[lntue via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c437052c0a473ebf4880947b1c70e0745acd1ee6
      https://github.com/llvm/llvm-project/commit/c437052c0a473ebf4880947b1c70e0745acd1ee6
  Author: lntue <lntue at google.com>
  Date:   2026-05-26 (Tue, 26 May 2026)

  Changed paths:
    M llvm/CMakeLists.txt
    M llvm/include/llvm/ADT/APFloat.h
    M llvm/lib/Support/APFloat.cpp
    M llvm/lib/Support/CMakeLists.txt
    M llvm/lib/Target/AMDGPU/AMDGPULibCalls.cpp
    M llvm/unittests/ADT/APFloatTest.cpp

  Log Message:
  -----------
  Reland "[APFloat] Add exp functions for single and double using exp/expf implementations from LLVM libc." (#197440) (#199570)

This reverts commit 1565f096d868f479f075fce3792db7b908cab9aa.

**Fixes applied on LLVM libc side:**
- gcc 7, 8, 9 compatibility:
  - https://github.com/llvm/llvm-project/pull/197476
  - https://github.com/llvm/llvm-project/pull/197868
- Add gcc's versions to LLVM libc-shared-tests precommit CI:
https://github.com/llvm/llvm-project/pull/199300

**Original commits messages:**

Discourse RFC:
https://discourse.llvm.org/t/rfc-make-clang-builtin-math-functions-constexpr-with-llvm-libc-to-support-c-23-constexpr-math-functions/86450

- The implementation in LLVM libc is free-standing header-only:
https://github.com/llvm/llvm-project/issues/147386
- expf / exp implementation in LLVM libc is correctly rounded for all
rounding modes.
- Only support default rounding modes for now. Other rounding modes will
wait for proper static rounding implementations in LLVM libc.
- No cmake build dependency between LLVM and LLVM libc, only requires
LLVM libc source presents in llvm-project/libc folder.



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