[all-commits] [llvm/llvm-project] eb3275: [AArch64] Lower fixed width bf16 fpext (#209194)

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: eb3275a0c3808d2705969c7570675346737b31b8
      https://github.com/llvm/llvm-project/commit/eb3275a0c3808d2705969c7570675346737b31b8
  Author: David Green <david.green at arm.com>
  Date:   2026-07-13 (Mon, 13 Jul 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    A llvm/test/CodeGen/AArch64/sve-fixed-length-fp-extend-trunc-bf16.ll

  Log Message:
  -----------
  [AArch64] Lower fixed width bf16 fpext (#209194)

This was previously hitting an error with a illegal
FP_EXTEND_MERGE_PASSTHRU being created but not selectable. Split
bf16->f64 fpext into bf16->f32 and f32->f64 fpext as we do elsewhere
(the first step has no rounding).

The codegen for loads is pretty inefficient because the load gets
expanded / scalarized.



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