[all-commits] [llvm/llvm-project] 5910e3: [X86][MC] Support encoding optimization & assembl...

[XinWang10 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5910e34a2f9a531e0fb6bb4ec1d2888f4a0c0897
      https://github.com/llvm/llvm-project/commit/5910e34a2f9a531e0fb6bb4ec1d2888f4a0c0897
  Author: XinWang10 <108658776+XinWang10 at users.noreply.github.com>
  Date:   2024-01-30 (Tue, 30 Jan 2024)

  Changed paths:
    M llvm/lib/Target/X86/MCTargetDesc/X86EncodingOptimization.cpp
    M llvm/lib/Target/X86/MCTargetDesc/X86EncodingOptimizationForImmediate.def
    M llvm/test/CodeGen/X86/apx/adc.ll
    M llvm/test/CodeGen/X86/apx/add.ll
    M llvm/test/CodeGen/X86/apx/and.ll
    M llvm/test/CodeGen/X86/apx/or.ll
    M llvm/test/CodeGen/X86/apx/rol.ll
    M llvm/test/CodeGen/X86/apx/sar.ll
    M llvm/test/CodeGen/X86/apx/sbb.ll
    M llvm/test/CodeGen/X86/apx/shift-eflags.ll
    M llvm/test/CodeGen/X86/apx/shr.ll
    M llvm/test/CodeGen/X86/apx/sub.ll
    M llvm/test/CodeGen/X86/apx/xor.ll
    A llvm/test/MC/X86/apx/adc-reloc.s
    A llvm/test/MC/X86/apx/add-reloc.s
    A llvm/test/MC/X86/apx/and-reloc.s
    A llvm/test/MC/X86/apx/imul-reloc.s
    A llvm/test/MC/X86/apx/or-reloc.s
    A llvm/test/MC/X86/apx/rcl-encopt.s
    A llvm/test/MC/X86/apx/rcr-encopt.s
    A llvm/test/MC/X86/apx/rol-encopt.s
    A llvm/test/MC/X86/apx/ror-encopt.s
    A llvm/test/MC/X86/apx/sar-encopt.s
    A llvm/test/MC/X86/apx/sbb-reloc.s
    A llvm/test/MC/X86/apx/shl-encopt.s
    A llvm/test/MC/X86/apx/shr-encopt.s
    A llvm/test/MC/X86/apx/sub-reloc.s
    A llvm/test/MC/X86/apx/xor-reloc.s

  Log Message:
  -----------
  [X86][MC] Support  encoding optimization & assembler relaxation about immediate operands for APX instructions (#78545)

Encoding optimization:
```
mi/mi32 -> mi8
ri/ri32 -> ri8
```
if the immediate operand is 8-bit wide.

Assembler relaxation:
```
mi8 -> mi/mi32
ri8 -> ri/ri32
```
If the immediate operand is a symbol expression and it's value is
unknown.