[all-commits] [llvm/llvm-project] 18d3a5: [LegalizeVectorTypes] When widening don't check fo...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18d3a5d558c3739cfe1d382e9976400d292e9b63
      https://github.com/llvm/llvm-project/commit/18d3a5d558c3739cfe1d382e9976400d292e9b63
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-10-07 (Mon, 07 Oct 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
    M llvm/test/CodeGen/RISCV/rvv/fixed-vectors-fp.ll

  Log Message:
  -----------
  [LegalizeVectorTypes] When widening don't check for libcalls if promoted (#111297)

When widening some FP ops, LegalizeVectorTypes will check to see if the
widened op may be scalarized and then turned into a bunch of libcalls,
and if so unroll early to avoid unnecessary libcalls of the padded undef
elements.

It checks if the widened op is legal or custom to see if it will be
scalarized, but promoted ops will also avoid scalarization.

This relaxes the check to account for this which fixes some illegal
vector types on RISC-V from being scalarized when they could be widened.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications