[all-commits] [llvm/llvm-project] 3ad09f: [X86] Separate CPU Feature lists in X86.td between...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 3ad09fd03c51823aeb0bcbd7898aada33e9228d6
      https://github.com/llvm/llvm-project/commit/3ad09fd03c51823aeb0bcbd7898aada33e9228d6
  Author: Craig Topper <craig.topper at intel.com>
  Date:   2020-07-30 (Thu, 30 Jul 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86.td

  Log Message:
  -----------
  [X86] Separate CPU Feature lists in X86.td between architecture features and tuning features

After the recent change to the tuning settings for pentium4 to improve our default 32-bit behavior, I've decided to see about implementing -mtune support. This way we could have a default architecture CPU of "pentium4" or "x86-64" and a default tuning cpu of "generic". And we could change our "pentium4" tuning settings back to what they were before.

As a step to supporting this, this patch separates all of the features lists for the CPUs into 2 lists. I'm using the Proc class and a new ProcModel class to concat the 2 lists before passing to the target independent ProcessorModel. Future work to truly support mtune would change ProcessorModel to take 2 lists separately. I've diffed the X86GenSubtargetInfo.inc file before and after this patch to ensure that the final feature list for the CPUs isn't changed.

Differential Revision: https://reviews.llvm.org/D84879