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| author | Sp00ph <markuseverling@gmail.com> | 2023-05-03 15:56:16 +0100 |
|---|---|---|
| committer | David Green <david.green@arm.com> | 2023-05-03 15:56:16 +0100 |
| commit | 8e46ac3623b4dfbd7127fc0deee5cf82a3f9d472 (patch) | |
| tree | c88d76557f566598d00dfd9578bc2f810a7c1a66 /llvm/unittests/Support/VirtualFileSystemTest.cpp | |
| parent | 53710b43a0546c329a7523055987981a4fc7973b (diff) | |
| download | llvm-8e46ac3623b4dfbd7127fc0deee5cf82a3f9d472.zip llvm-8e46ac3623b4dfbd7127fc0deee5cf82a3f9d472.tar.gz llvm-8e46ac3623b4dfbd7127fc0deee5cf82a3f9d472.tar.bz2 | |
[AArch64] Add more efficient bitwise vector reductions.
Improves the codegen for VECREDUCE_{AND,OR,XOR} operations on AArch64.
Currently, these are fully scalarized, except if the vector is a <N x i1>. This
patch improves the codegen down to O(log(N)) where N is the length of the
vector for vectors whose elements are not i1, by repeatedly applying the
bitwise operations to the two halves of the vector. <N x i1> bitwise reductions
are handled using VECREDUCE_{UMAX,UMIN,ADD} instead.
I had to update quite a few codegen tests with these changes, with a general
downward trend in instruction count. Since the vector reductions already have
tests, I haven't added any new tests myself.
Differential Revision: https://reviews.llvm.org/D148185
Diffstat (limited to 'llvm/unittests/Support/VirtualFileSystemTest.cpp')
0 files changed, 0 insertions, 0 deletions