[all-commits] [llvm/llvm-project] 7ae758: [X86][APX] Support peephole optimization with CCMP...

[Feng Zou via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7ae75851b2e1570662261c97c13cfc65357c283d
      https://github.com/llvm/llvm-project/commit/7ae75851b2e1570662261c97c13cfc65357c283d
  Author: Feng Zou <feng.zou at intel.com>
  Date:   2025-03-12 (Wed, 12 Mar 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86InstrConditionalCompare.td
    M llvm/lib/Target/X86/X86InstrInfo.cpp
    M llvm/test/CodeGen/X86/apx/ccmp.ll
    A llvm/test/CodeGen/X86/apx/optimize-compare-ccmp.mir
    M llvm/test/CodeGen/X86/optimize-compare.mir

  Log Message:
  -----------
  [X86][APX] Support peephole optimization with CCMP instruction (#129994)

This extends `opitimizeCompareInstr` to re-use previous CCMP results if
the
previous comparison was with an immediates that was 1 bigger or smaller.
Example:
```
CCMP x, 13, 2, 5
...
CCMP x, 12, 2, 5 ; can be removed if we change the SETg
SETg ...         ; x > 12 changed to SETge (x >= 13) & remove the 2nd
CCMP
```



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