; LLVM IR from SanketSarmalkar/Numerical_Methods :: System_of_Equation/DirectMethod.ll (Z12exchange_rowPPdiii)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fabs.f64(double) #1

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z12exchange_rowPPdiii(ptr noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) #2 {
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca ptr, align 8
  %11 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store i32 %1, ptr %6, align 4, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !9
  store i32 %3, ptr %8, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %10) #3
  %12 = load i32, ptr %6, align 4, !tbaa !9
  %13 = add nsw i32 %12, 1
  store i32 %13, ptr %9, align 4, !tbaa !9
  br label %14

14:                                               ; preds = %51, %4
  %15 = load i32, ptr %9, align 4, !tbaa !9
  %16 = load i32, ptr %8, align 4, !tbaa !9
  %17 = icmp slt i32 %15, %16
  br i1 %17, label %18, label %54

18:                                               ; preds = %14
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i32, ptr %9, align 4, !tbaa !9
  %21 = sext i32 %20 to i64
  %22 = getelementptr inbounds ptr, ptr %19, i64 %21
  %23 = load ptr, ptr %22, align 8, !tbaa !5
  %24 = load i32, ptr %7, align 4, !tbaa !9
  %25 = sext i32 %24 to i64
  %26 = getelementptr inbounds double, ptr %23, i64 %25
  %27 = load double, ptr %26, align 8, !tbaa !11
  %28 = call double @llvm.fabs.f64(double %27)
  %29 = fcmp ogt double %28, 1.000000e-05
  br i1 %29, label %30, label %50

30:                                               ; preds = %18
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = load i32, ptr %6, align 4, !tbaa !9
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds ptr, ptr %31, i64 %33
  %35 = load ptr, ptr %34, align 8, !tbaa !5
  store ptr %35, ptr %10, align 8, !tbaa !5
  %36 = load ptr, ptr %5, align 8, !tbaa !5
  %37 = load i32, ptr %9, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds ptr, ptr %36, i64 %38
  %40 = load ptr, ptr %39, align 8, !tbaa !5
  %41 = load ptr, ptr %5, align 8, !tbaa !5
  %42 = load i32, ptr %6, align 4, !tbaa !9
  %43 = sext i32 %42 to i64
  %44 = getelementptr inbounds ptr, ptr %41, i64 %43
  store ptr %40, ptr %44, align 8, !tbaa !5
  %45 = load ptr, ptr %10, align 8, !tbaa !5
  %46 = load ptr, ptr %5, align 8, !tbaa !5
  %47 = load i32, ptr %9, align 4, !tbaa !9
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds ptr, ptr %46, i64 %48
  store ptr %45, ptr %49, align 8, !tbaa !5
  store i32 1, ptr %11, align 4
  br label %55

50:                                               ; preds = %18
  br label %51

51:                                               ; preds = %50
  %52 = load i32, ptr %9, align 4, !tbaa !9
  %53 = add nsw i32 %52, 1
  store i32 %53, ptr %9, align 4, !tbaa !9
  br label %14, !llvm.loop !13

54:                                               ; preds = %14
  store i32 1, ptr %11, align 4
  br label %55

55:                                               ; preds = %54, %30
  call void @llvm.lifetime.end.p0(i64 8, ptr %10) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #3
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #2 = { mustprogress nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #3 = { nounwind }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare double @llvm.fabs.f64(double) #0

; Function Attrs: mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local void @_Z12exchange_rowPPdiii(ptr nocapture noundef %0, i32 noundef %1, i32 noundef %2, i32 noundef %3) local_unnamed_addr #1 {
  %5 = sext i32 %2 to i64
  %6 = sext i32 %1 to i64
  %7 = sext i32 %3 to i64
  br label %8

8:                                                ; preds = %10, %4
  %indvars.iv = phi i64 [ %indvars.iv.next, %10 ], [ %6, %4 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, 1
  %9 = icmp slt i64 %indvars.iv.next, %7
  br i1 %9, label %10, label %.loopexit

10:                                               ; preds = %8
  %11 = getelementptr inbounds ptr, ptr %0, i64 %indvars.iv.next
  %12 = load ptr, ptr %11, align 8, !tbaa !5
  %13 = getelementptr inbounds double, ptr %12, i64 %5
  %14 = load double, ptr %13, align 8, !tbaa !9
  %15 = tail call double @llvm.fabs.f64(double %14)
  %16 = fcmp ogt double %15, 1.000000e-05
  br i1 %16, label %17, label %8, !llvm.loop !11

17:                                               ; preds = %10
  %18 = getelementptr inbounds ptr, ptr %0, i64 %indvars.iv.next
  %19 = getelementptr inbounds ptr, ptr %0, i64 %6
  %20 = load ptr, ptr %19, align 8, !tbaa !5
  store ptr %12, ptr %19, align 8, !tbaa !5
  store ptr %20, ptr %18, align 8, !tbaa !5
  br label %.loopexit

.loopexit:                                        ; preds = %8, %17
  ret void
}

attributes #0 = { mustprogress nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #1 = { mustprogress nofree norecurse nosync nounwind memory(read, argmem: readwrite, inaccessiblemem: none) uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"double", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass