[all-commits] [llvm/llvm-project] cb112e: [X86][CodeGen] Teach frame lowering to spill/reloa...

[Shengchen Kan via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cb112eb16cff222d8fbe7cfd3cb0834f538a691d
      https://github.com/llvm/llvm-project/commit/cb112eb16cff222d8fbe7cfd3cb0834f538a691d
  Author: Shengchen Kan <shengchen.kan at intel.com>
  Date:   2023-11-27 (Mon, 27 Nov 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86.td
    M llvm/lib/Target/X86/X86FrameLowering.cpp
    M llvm/lib/Target/X86/X86MachineFunctionInfo.h
    A llvm/test/CodeGen/X86/apx/push2-pop2-cfi-seh.ll
    A llvm/test/CodeGen/X86/apx/push2-pop2-vector-register.ll
    A llvm/test/CodeGen/X86/apx/push2-pop2.ll
    A llvm/test/CodeGen/X86/apx/pushp-popp.ll

  Log Message:
  -----------
  [X86][CodeGen] Teach frame lowering to spill/reload registers w/ PUSHP/POPP, PUSH2[P]/POP2[P] (#73292)

#73092 supported the encoding/decoding for PUSHP/POPP
#73233 supported the encoding/decoding for PUSH2[P]/POP2[P]

In this patch, we teach frame lowering to spill/reload registers w/
these instructions.

1. Use PPX for balanced spill/reload
2. Use PUSH2/POP2 for continuous spills/reloads
3. PUSH2/POP2 must be 16B-aligned on the stack, so pad when necessary