[all-commits] [llvm/llvm-project] cdab6f: [X86] Don't save/restore fp/bp around terminator (...

[weiguozhi via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cdab6ffd6d32566277f71d9733e4b21750ea38c8
      https://github.com/llvm/llvm-project/commit/cdab6ffd6d32566277f71d9733e4b21750ea38c8
  Author: weiguozhi <57237827+weiguozhi at users.noreply.github.com>
  Date:   2024-09-03 (Tue, 03 Sep 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86FrameLowering.cpp
    M llvm/test/CodeGen/X86/clobber_frame_ptr.ll

  Log Message:
  -----------
  [X86] Don't save/restore fp/bp around terminator (#106462)

In function spillFPBP we already try to skip terminator, but there is a
logic error, so when there is only terminator instruction in the MBB, it
still tries to save/restore fp/bp around it if the terminator clobbers
fp/bp, for example a tail call with ghc calling convention.

Now this patch really skips terminator even if it is the only
instruction in the MBB.



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