[all-commits] [llvm/llvm-project] dbf3b5: [InstCombine] fold more shuffles with FP<->Int cas...

[Sanjay Patel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dbf3b5f114553e4d5a446cd9ef57e98a8d04354e
      https://github.com/llvm/llvm-project/commit/dbf3b5f114553e4d5a446cd9ef57e98a8d04354e
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2022-05-17 (Tue, 17 May 2022)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
    M llvm/test/Transforms/InstCombine/vec_shuffle.ll

  Log Message:
  -----------
  [InstCombine] fold more shuffles with FP<->Int cast operands

shuffle (cast X), (cast Y), Mask --> cast (shuffle X, Y, Mask)

This extends the transform added with 0353c2c996c5.

If the casts are to a larger element type, the transform
reduces shuffle bit width, so that should be a win for
most codegen (if not, it can be inverted).