[all-commits] [llvm/llvm-project] 8a92c4: [Clang] Add integer mul reduction builtin

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8a92c45e07dc81c83ca3afda3971d98c512429d4
      https://github.com/llvm/llvm-project/commit/8a92c45e07dc81c83ca3afda3971d98c512429d4
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-05-09 (Mon, 09 May 2022)

  Changed paths:
    M clang/docs/LanguageExtensions.rst
    M clang/include/clang/Basic/Builtins.def
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/Sema/SemaChecking.cpp
    M clang/test/CodeGen/builtins-reduction-math.c
    M clang/test/Sema/builtins-reduction-math.c

  Log Message:
  -----------
  [Clang] Add integer mul reduction builtin

Similar to the existing bitwise reduction builtins, this lowers to a llvm.vector.reduce.mul intrinsic call.

For other reductions, we've tried to share builtins for float/integer vectors, but the fmul reduction intrinsic also take a starting value argument and can either do unordered or serialized, but not reduction-trees as specified for the builtins. However we address fmul support this shouldn't affect the integer case.

Differential Revision: https://reviews.llvm.org/D117829