[all-commits] [llvm/llvm-project] 045d84: D94954: Fixes Snapdragon Kryo CPU core detection

[Ryan Houdek via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 045d84f4e6d7d6bbccaa6d965669a068fc329809
      https://github.com/llvm/llvm-project/commit/045d84f4e6d7d6bbccaa6d965669a068fc329809
  Author: Ryan Houdek <sonicadvance1 at gmail.com>
  Date:   2021-01-20 (Wed, 20 Jan 2021)

  Changed paths:
    M llvm/lib/Support/Host.cpp
    M llvm/unittests/Support/Host.cpp

  Log Message:
  -----------
  D94954: Fixes Snapdragon Kryo CPU core detection

All of these families were claiming to be a73 based, which was causing
-mcpu/mtune=native to never use the newer features available to these
cores.

Goes through each and bumps the individual cores to their respective Big
counterparts. Since this code path doesn't support big.little detection,
there was already a precedent set with the Qualcomm line to choose the
big cores only.

Adds a comment on each line for the product's name that the part number
refers to. Confirmed on-device and through Linux header naming
convections.

Additionally newer SoCs mix CPU implementer parts from multiple
implementers. Both 0x41 (ARM) and 0x51 (Qualcomm) in the Snapdragon case

This was causing a desync in information where the scan at the start to
find the implementer would mismatch the part scan later on.
Now scan for both implementer and part at the start so these stay in
sync.

Differential Revision: https://reviews.llvm.org/D94954