[all-commits] [llvm/llvm-project] 03e7fe: [PowerPC] Canonicalize shuffles on big endian targ...

[Nemanja Ivanovic via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 03e7fefff8caa6891cbb510283fa8c40247a9b0c
      https://github.com/llvm/llvm-project/commit/03e7fefff8caa6891cbb510283fa8c40247a9b0c
  Author: Nemanja Ivanovic <nemanja.i.ibm at gmail.com>
  Date:   2021-04-20 (Tue, 20 Apr 2021)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/lib/Target/PowerPC/PPCInstrVSX.td
    M llvm/test/CodeGen/PowerPC/aix32-p8-scalar_vector_conversions.ll
    M llvm/test/CodeGen/PowerPC/build-vector-tests.ll
    M llvm/test/CodeGen/PowerPC/canonical-merge-shuffles.ll
    M llvm/test/CodeGen/PowerPC/fp-strict-round.ll
    M llvm/test/CodeGen/PowerPC/load-v4i8-improved.ll
    M llvm/test/CodeGen/PowerPC/p8-scalar_vector_conversions.ll
    M llvm/test/CodeGen/PowerPC/power9-moves-and-splats.ll
    M llvm/test/CodeGen/PowerPC/pr25080.ll
    M llvm/test/CodeGen/PowerPC/pre-inc-disable.ll
    M llvm/test/CodeGen/PowerPC/scalar_vector_test_4.ll
    M llvm/test/CodeGen/PowerPC/srem-vector-lkk.ll
    M llvm/test/CodeGen/PowerPC/urem-vector-lkk.ll
    M llvm/test/CodeGen/PowerPC/vec-itofp.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_fp32_to_i16_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_fp32_to_i8_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_fp64_to_i16_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_fp64_to_i32_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_fp64_to_i8_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_i16_to_fp32_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_i16_to_fp64_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_i64_to_fp32_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_i8_to_fp32_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_conv_i8_to_fp64_elts.ll
    M llvm/test/CodeGen/PowerPC/vec_int_ext.ll
    M llvm/test/CodeGen/PowerPC/vector-constrained-fp-intrinsics.ll
    M llvm/test/CodeGen/PowerPC/vsx.ll

  Log Message:
  -----------
  [PowerPC] Canonicalize shuffles on big endian targets as well

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.

Differential revision: https://reviews.llvm.org/D100478