[all-commits] [llvm/llvm-project] c5672e: [AArch64][CostModel] Reduce the cost of fadd reduc...

[Sushant Gokhale via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c5672e21ca2a16ff18cdaa83db11d2edb84c5e14
      https://github.com/llvm/llvm-project/commit/c5672e21ca2a16ff18cdaa83db11d2edb84c5e14
  Author: Sushant Gokhale <sgokhale at nvidia.com>
  Date:   2024-09-24 (Tue, 24 Sep 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/AArch64/reduce-fadd.ll
    M llvm/test/Transforms/SLPVectorizer/AArch64/reduce-fadd.ll

  Log Message:
  -----------
  [AArch64][CostModel] Reduce the cost of fadd reduction with fast flag (#108791)

fadd reduction with
  1. Fast flag set
2. No of elements in input vector is power of 2 results in series of
faddp instructions. faddp instruction has latency/throughput identical
to fadd instruction and hence, we set relative cost=1 for faddp as well.

The change didn't show any regression with SPEC17-FP(C/C++),
llvm-test-suite on Neoverse-V2.



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