[all-commits] [llvm/llvm-project] a7c647: [Passes] Run vector-combine early with -fenable-ma...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a7c6471a85380f5af644e50daf2951b41c82f1b2
      https://github.com/llvm/llvm-project/commit/a7c6471a85380f5af644e50daf2951b41c82f1b2
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2021-09-22 (Wed, 22 Sep 2021)

  Changed paths:
    M llvm/lib/Passes/PassBuilderPipelines.cpp
    M llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
    M llvm/test/Other/new-pm-defaults.ll
    M llvm/test/Transforms/PhaseOrdering/AArch64/matrix-extract-insert.ll

  Log Message:
  -----------
  [Passes] Run vector-combine early with -fenable-matrix.

IR with matrix intrinsics is likely to also contain large vector
operations, which can benefit from early simplifications.

This is the last step in a series of changes to improve code-gen for
code using matrix subscript operators with the C/C++ matrix extension in
CLang, like

    using matrix_t = double __attribute__((matrix_type(15, 15)));

    void foo(unsigned i, matrix_t &A, matrix_t &B) {
      for (unsigned j = 0; j < 4; ++j)
        for (unsigned k = 0; k < i; k++)
          B[k][j] -= A[k][j] * B[i][j];
    }

https://clang.godbolt.org/z/6dKxK1Ed7

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D102496