[PATCH] D100478: [PowerPC] Canonicalize shuffles on big endian targets as well

[Nemanja Ivanovic via Phabricator via llvm-commits]

nemanjai created this revision.
nemanjai added reviewers: PowerPC, pjeeva01.
Herald added subscribers: shchenz, kbarton, hiraditya.
nemanjai requested review of this revision.
Herald added a project: LLVM.

Extend shuffle canonicalization and conversion of shuffles fed by vectorized scalars to big endian subtargets. For big endian subtargets, loads and direct moves of scalars into vector registers put the data in the correct element for `SCALAR_TO_VECTOR` if the data type is 8 bytes wide. However, if the data type is narrower, the value still ends up in the wrong place - althouth a different wrong place than on little endian targets.
This patch extends the combine that keeps values where they are if they feed a shuffle to big endian targets.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D100478

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCInstrVSX.td
  llvm/test/CodeGen/PowerPC/build-vector-tests.ll
  llvm/test/CodeGen/PowerPC/canonical-merge-shuffles.ll
  llvm/test/CodeGen/PowerPC/fp-strict-round.ll
  llvm/test/CodeGen/PowerPC/load-and-splat.ll
  llvm/test/CodeGen/PowerPC/load-v4i8-improved.ll
  llvm/test/CodeGen/PowerPC/p8-scalar_vector_conversions.ll
  llvm/test/CodeGen/PowerPC/pr25080.ll
  llvm/test/CodeGen/PowerPC/pre-inc-disable.ll
  llvm/test/CodeGen/PowerPC/scalar_vector_test_4.ll
  llvm/test/CodeGen/PowerPC/srem-vector-lkk.ll
  llvm/test/CodeGen/PowerPC/urem-vector-lkk.ll
  llvm/test/CodeGen/PowerPC/vec-itofp.ll
  llvm/test/CodeGen/PowerPC/vec_conv_fp32_to_i16_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_fp32_to_i8_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_fp64_to_i16_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_fp64_to_i32_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_fp64_to_i8_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_i16_to_fp32_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_i16_to_fp64_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_i64_to_fp32_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_i8_to_fp32_elts.ll
  llvm/test/CodeGen/PowerPC/vec_conv_i8_to_fp64_elts.ll
  llvm/test/CodeGen/PowerPC/vec_insert_elt.ll
  llvm/test/CodeGen/PowerPC/vec_int_ext.ll

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