[all-commits] [llvm/llvm-project] 6778c1: [AArch64] Fix SVE cost model for various math intr...

[David Sherwood via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6778c11f5cf26718c0fd057d24d416018932204b
      https://github.com/llvm/llvm-project/commit/6778c11f5cf26718c0fd057d24d416018932204b
  Author: David Sherwood <david.sherwood at arm.com>
  Date:   2026-03-05 (Thu, 05 Mar 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/AArch64/sve-intrinsics.ll
    M llvm/test/Analysis/CostModel/AArch64/sve-math.ll
    M llvm/test/Analysis/CostModel/AArch64/sve-min-max.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/veclib-intrinsic-calls.ll

  Log Message:
  -----------
  [AArch64] Fix SVE cost model for various math intrinsics (#184358)

The implementation of getIntrinsicInstrCost in BasicTTIImpl
assumes that for some intrinsics if we're using custom
lowering for the equivalent DAG node that the cost needs to
be 2, instead of 1 for legal ops. However, even though we
use custom lowering for these scalable vector operations
when SVE is available, we still end up generating the same
efficient codegen as fixed-width. This patch deals with a
few obvious intrinsics that we know get lowered to something
sensible and return the same cost as NEON, i.e. 1.



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