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| author | Guozhi Wei <carrot@google.com> | 2022-06-28 21:42:51 +0000 |
|---|---|---|
| committer | Guozhi Wei <carrot@google.com> | 2022-06-28 21:42:51 +0000 |
| commit | ddc9e8861ccf8ac3cf45e9d8cda58bdb2b0be63b (patch) | |
| tree | ba95035430506b2426f3c9a2fc5dc0bb9a05b135 /llvm/lib/CodeGen/MachineCombiner.cpp | |
| parent | 906f52f2c4fc4cedbe37d420cbd3031da0641d81 (diff) | |
| download | llvm-ddc9e8861ccf8ac3cf45e9d8cda58bdb2b0be63b.zip llvm-ddc9e8861ccf8ac3cf45e9d8cda58bdb2b0be63b.tar.gz llvm-ddc9e8861ccf8ac3cf45e9d8cda58bdb2b0be63b.tar.bz2 | |
[MachineCombiner, AArch64] Add a new pattern A-(B+C) => (A-B)-C to reduce latency
Add a new pattern A - (B + C) ==> (A - B) - C to give machine combiner a chance
to evaluate which instruction sequence has lower latency.
Differential Revision: https://reviews.llvm.org/D124564
Diffstat (limited to 'llvm/lib/CodeGen/MachineCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/MachineCombiner.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MachineCombiner.cpp b/llvm/lib/CodeGen/MachineCombiner.cpp index 05e4a1e..722a709 100644 --- a/llvm/lib/CodeGen/MachineCombiner.cpp +++ b/llvm/lib/CodeGen/MachineCombiner.cpp @@ -277,6 +277,8 @@ static CombinerObjective getCombinerObjective(MachineCombinerPattern P) { case MachineCombinerPattern::REASSOC_XA_YB: case MachineCombinerPattern::REASSOC_XY_AMM_BMM: case MachineCombinerPattern::REASSOC_XMM_AMM_BMM: + case MachineCombinerPattern::SUBADD_OP1: + case MachineCombinerPattern::SUBADD_OP2: return CombinerObjective::MustReduceDepth; case MachineCombinerPattern::REASSOC_XY_BCA: case MachineCombinerPattern::REASSOC_XY_BAC: |