[all-commits] [llvm/llvm-project] 92249a: [Hexagon] Avoid contracting predicates in createHv...

[Krzysztof Parzyszek via All-commits]

  Branch: refs/heads/release/22.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 92249a35ad7ccd89eaefe42be3b9422e01bdbb85
      https://github.com/llvm/llvm-project/commit/92249a35ad7ccd89eaefe42be3b9422e01bdbb85
  Author: Krzysztof Parzyszek <Krzysztof.Parzyszek at amd.com>
  Date:   2026-03-06 (Fri, 06 Mar 2026)

  Changed paths:
    M llvm/lib/Target/Hexagon/HexagonISelLowering.h
    M llvm/lib/Target/Hexagon/HexagonISelLoweringHVX.cpp
    A llvm/test/CodeGen/Hexagon/autohvx/isel-hvx-rescale-predicate.ll

  Log Message:
  -----------
  [Hexagon] Avoid contracting predicates in createHvxPrefixPred (#183081)

The function createHvxPrefixPred should only need to expand a predicate
to match the result's bytes-per-bit. Otherwise, contracting of the
predicate may lead to an input that is shorter than 4 bytes, making it
unsuitable for VINSERTW0.

When calling createHvxPrefixPred for vector concatention, re-group the
inputs to the concat to make sure that the resulting inputs to
createHvxPrefixPred would not need contraction.

Fixes https://github.com/llvm/llvm-project/issues/181362



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