[LoongArch] Pass OptLevel to LoongArchDAGToDAGISel correctly

Like many other targets did. And see RISCV for similar fix.

Fix #143239

Author: SixWeining

llvm/lib/Target/LoongArch/LoongArch.h

@@ -35,7 +35,8 @@ bool lowerLoongArchMachineOperandToMCOperand(const MachineOperand &MO,
 
 FunctionPass *createLoongArchDeadRegisterDefinitionsPass();
 FunctionPass *createLoongArchExpandAtomicPseudoPass();
-FunctionPass *createLoongArchISelDag(LoongArchTargetMachine &TM);
+FunctionPass *createLoongArchISelDag(LoongArchTargetMachine &TM,
+                                     CodeGenOptLevel OptLevel);
 FunctionPass *createLoongArchMergeBaseOffsetOptPass();
 FunctionPass *createLoongArchOptWInstrsPass();
 FunctionPass *createLoongArchPreRAExpandPseudoPass();

llvm/lib/Target/LoongArch/LoongArchISelDAGToDAG.cpp

@@ -25,8 +25,9 @@ using namespace llvm;
 char LoongArchDAGToDAGISelLegacy::ID;
 
 LoongArchDAGToDAGISelLegacy::LoongArchDAGToDAGISelLegacy(
-    LoongArchTargetMachine &TM)
-    : SelectionDAGISelLegacy(ID, std::make_unique<LoongArchDAGToDAGISel>(TM)) {}
+    LoongArchTargetMachine &TM, CodeGenOptLevel OptLevel)
+    : SelectionDAGISelLegacy(
+          ID, std::make_unique<LoongArchDAGToDAGISel>(TM, OptLevel)) {}
 
 INITIALIZE_PASS(LoongArchDAGToDAGISelLegacy, DEBUG_TYPE, PASS_NAME, false,
                 false)
@@ -456,6 +457,7 @@ bool LoongArchDAGToDAGISel::selectVSplatUimmPow2(SDValue N,
 
 // This pass converts a legalized DAG into a LoongArch-specific DAG, ready
 // for instruction scheduling.
-FunctionPass *llvm::createLoongArchISelDag(LoongArchTargetMachine &TM) {
-  return new LoongArchDAGToDAGISelLegacy(TM);
+FunctionPass *llvm::createLoongArchISelDag(LoongArchTargetMachine &TM,
+                                           CodeGenOptLevel OptLevel) {
+  return new LoongArchDAGToDAGISelLegacy(TM, OptLevel);
 }

llvm/lib/Target/LoongArch/LoongArchISelDAGToDAG.h

@@ -26,8 +26,9 @@ class LoongArchDAGToDAGISel : public SelectionDAGISel {
 public:
   LoongArchDAGToDAGISel() = delete;
 
-  explicit LoongArchDAGToDAGISel(LoongArchTargetMachine &TM)
-      : SelectionDAGISel(TM) {}
+  explicit LoongArchDAGToDAGISel(LoongArchTargetMachine &TM,
+                                 CodeGenOptLevel OptLevel)
+      : SelectionDAGISel(TM, OptLevel) {}
 
   bool runOnMachineFunction(MachineFunction &MF) override {
     Subtarget = &MF.getSubtarget<LoongArchSubtarget>();
@@ -93,7 +94,8 @@ class LoongArchDAGToDAGISel : public SelectionDAGISel {
 class LoongArchDAGToDAGISelLegacy : public SelectionDAGISelLegacy {
 public:
   static char ID;
-  explicit LoongArchDAGToDAGISelLegacy(LoongArchTargetMachine &TM);
+  explicit LoongArchDAGToDAGISelLegacy(LoongArchTargetMachine &TM,
+                                       CodeGenOptLevel OptLevel);
 };
 
 } // end namespace llvm

llvm/lib/Target/LoongArch/LoongArchTargetMachine.cpp

@@ -189,7 +189,7 @@ void LoongArchPassConfig::addCodeGenPrepare() {
 }
 
 bool LoongArchPassConfig::addInstSelector() {
-  addPass(createLoongArchISelDag(getLoongArchTargetMachine()));
+  addPass(createLoongArchISelDag(getLoongArchTargetMachine(), getOptLevel()));
 
   return false;
 }

llvm/test/CodeGen/LoongArch/O0-pipeline.ll

@@ -34,15 +34,7 @@
 ; CHECK-NEXT:       Safe Stack instrumentation pass
 ; CHECK-NEXT:       Insert stack protectors
 ; CHECK-NEXT:       Module Verifier
-; CHECK-NEXT:       Dominator Tree Construction
-; CHECK-NEXT:       Basic Alias Analysis (stateless AA impl)
-; CHECK-NEXT:       Function Alias Analysis Results
-; CHECK-NEXT:       Natural Loop Information
-; CHECK-NEXT:       Post-Dominator Tree Construction
-; CHECK-NEXT:       Branch Probability Analysis
 ; CHECK-NEXT:       Assignment Tracking Analysis
-; CHECK-NEXT:       Lazy Branch Probability Analysis
-; CHECK-NEXT:       Lazy Block Frequency Analysis
 ; CHECK-NEXT:       LoongArch DAG->DAG Pattern Instruction Selection
 ; CHECK-NEXT:       Finalize ISel and expand pseudo-instructions
 ; CHECK-NEXT:       Local Stack Slot Allocation

llvm/test/CodeGen/LoongArch/isel-optnone.ll

@@ -2,11 +2,8 @@
 ; RUN: llc %s -O0 -mtriple=loongarch64 -o /dev/null -debug-only=isel 2>&1 | FileCheck %s
 
 define void @fooOptnone() #0 {
-; CHECK: Changing optimization level for Function fooOptnone
-; CHECK: Before: -O2 ; After: -O0
-
-; CHECK: Restoring optimization level for Function fooOptnone
-; CHECK: Before: -O0 ; After: -O2
+; CHECK-NOT: Changing optimization level for Function fooOptnone
+; CHECK-NOT: Restoring optimization level for Function fooOptnone
   ret void
 }
 

llvm/test/CodeGen/LoongArch/spill-ra-without-kill.ll

@@ -39,6 +39,7 @@ define dso_local ptr @f(i32 noundef signext %i) "frame-pointer"="all" {
 ; CHECK-NEXT:    b .LBB0_3
 ; CHECK-NEXT:  .LBB0_3: # %if.end
 ; CHECK-NEXT:    ld.d $a0, $fp, -48 # 8-byte Folded Reload
+; CHECK-NEXT:    addi.w $a0, $a0, 0
 ; CHECK-NEXT:    ori $a1, $zero, 1
 ; CHECK-NEXT:    bne $a0, $a1, .LBB0_6
 ; CHECK-NEXT:    b .LBB0_4