[llvm] [X86] Remove unused MachineLoopInfo from X86FixupBWInsts. NFC (PR #92984)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/92984.diff


2 Files Affected:

- (modified) llvm/lib/Target/X86/X86FixupBWInsts.cpp (-7) 
- (modified) llvm/test/CodeGen/X86/opt-pipeline.ll (-2) 


``````````diff
diff --git a/llvm/lib/Target/X86/X86FixupBWInsts.cpp b/llvm/lib/Target/X86/X86FixupBWInsts.cpp
index db1d21b59a7ba..a0c91d4e3c3d7 100644
--- a/llvm/lib/Target/X86/X86FixupBWInsts.cpp
+++ b/llvm/lib/Target/X86/X86FixupBWInsts.cpp
@@ -53,7 +53,6 @@
 #include "llvm/CodeGen/LiveRegUnits.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/MachineLoopInfo.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/MachineSizeOpts.h"
 #include "llvm/CodeGen/Passes.h"
@@ -113,8 +112,6 @@ class FixupBWInstPass : public MachineFunctionPass {
   FixupBWInstPass() : MachineFunctionPass(ID) { }
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.addRequired<MachineLoopInfo>(); // Machine loop info is used to
-                                       // guide some heuristics.
     AU.addRequired<ProfileSummaryInfoWrapperPass>();
     AU.addRequired<LazyMachineBlockFrequencyInfoPass>();
     MachineFunctionPass::getAnalysisUsage(AU);
@@ -141,9 +138,6 @@ class FixupBWInstPass : public MachineFunctionPass {
   /// Local member for function's OptForSize attribute.
   bool OptForSize = false;
 
-  /// Machine loop info used for guiding some heruistics.
-  MachineLoopInfo *MLI = nullptr;
-
   /// Register Liveness information after the current instruction.
   LiveRegUnits LiveUnits;
 
@@ -164,7 +158,6 @@ bool FixupBWInstPass::runOnMachineFunction(MachineFunction &MF) {
   this->MF = &MF;
   TII = MF.getSubtarget<X86Subtarget>().getInstrInfo();
   TRI = MF.getRegInfo().getTargetRegisterInfo();
-  MLI = &getAnalysis<MachineLoopInfo>();
   PSI = &getAnalysis<ProfileSummaryInfoWrapperPass>().getPSI();
   MBFI = (PSI && PSI->hasProfileSummary()) ?
          &getAnalysis<LazyMachineBlockFrequencyInfoPass>().getBFI() :
diff --git a/llvm/test/CodeGen/X86/opt-pipeline.ll b/llvm/test/CodeGen/X86/opt-pipeline.ll
index 43589dc993dab..3f57a03decd02 100644
--- a/llvm/test/CodeGen/X86/opt-pipeline.ll
+++ b/llvm/test/CodeGen/X86/opt-pipeline.ll
@@ -197,8 +197,6 @@
 ; CHECK-NEXT:       BreakFalseDeps
 ; CHECK-NEXT:       X86 Indirect Branch Tracking
 ; CHECK-NEXT:       X86 vzeroupper inserter
-; CHECK-NEXT:       MachineDominator Tree Construction
-; CHECK-NEXT:       Machine Natural Loop Construction
 ; CHECK-NEXT:       Lazy Machine Block Frequency Analysis
 ; CHECK-NEXT:       X86 Byte/Word Instruction Fixup
 ; CHECK-NEXT:       Lazy Machine Block Frequency Analysis

``````````

</details>


https://github.com/llvm/llvm-project/pull/92984