[all-commits] [llvm/llvm-project] ac299e: [SLP] Provide an universal interface for FixedVect...

[Han-Kuan Chen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ac299ed2c752928d34b5db339a926286115f0718
      https://github.com/llvm/llvm-project/commit/ac299ed2c752928d34b5db339a926286115f0718
  Author: Han-Kuan Chen <hankuan.chen at sifive.com>
  Date:   2024-07-10 (Wed, 10 Jul 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

  Log Message:
  -----------
  [SLP] Provide an universal interface for FixedVectorType::get. NFC. (#96845)

SLP vectorizes scalar type to vector type. In the future, we will try to
make SLP vectorizes vector type to vector type. We add a getWidenedType
as a helper function. For example, SLP will make the following code

%v0 = load i32, ptr %in0, align 4
%v1 = load i32, ptr %in1, align 4
%v2 = load i32, ptr %in2, align 4
%v3 = load i32, ptr %in3, align 4

into a load <4 x i32>. The ScalarTy is i32 and VF is 4. In the future,
SLP will make the following code

%v0 = load <4 x i32>, ptr %in0, align 4
%v1 = load <4 x i32>, ptr %in1, align 4
%v2 = load <4 x i32>, ptr %in2, align 4
%v3 = load <4 x i32>, ptr %in3, align 4

into a load <16 x i32>. The ScalarTy is <4 x i32> and VF is 4.

reference:
https://discourse.llvm.org/t/rfc-make-slp-vectorizer-revectorize-vector-instructions/79436



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