; LLVM IR from chrr/libECP :: src (util)

; 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: nounwind uwtable
define dso_local double @n_over_k(i32 noundef %0, i32 noundef %1, ptr noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca double, align 8
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store ptr %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store double 0.000000e+00, ptr %7, align 8, !tbaa !11
  %8 = load i32, ptr %5, align 4, !tbaa !5
  %9 = icmp sge i32 %8, 0
  br i1 %9, label %10, label %34

10:                                               ; preds = %3
  %11 = load i32, ptr %5, align 4, !tbaa !5
  %12 = load i32, ptr %4, align 4, !tbaa !5
  %13 = icmp sle i32 %11, %12
  br i1 %13, label %14, label %34

14:                                               ; preds = %10
  %15 = load ptr, ptr %6, align 8, !tbaa !9
  %16 = load i32, ptr %4, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds double, ptr %15, i64 %17
  %19 = load double, ptr %18, align 8, !tbaa !11
  %20 = load ptr, ptr %6, align 8, !tbaa !9
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = load i32, ptr %5, align 4, !tbaa !5
  %23 = sub nsw i32 %21, %22
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds double, ptr %20, i64 %24
  %26 = load double, ptr %25, align 8, !tbaa !11
  %27 = load ptr, ptr %6, align 8, !tbaa !9
  %28 = load i32, ptr %5, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds double, ptr %27, i64 %29
  %31 = load double, ptr %30, align 8, !tbaa !11
  %32 = fmul double %26, %31
  %33 = fdiv double %19, %32
  store double %33, ptr %7, align 8, !tbaa !11
  br label %34

34:                                               ; preds = %14, %10, %3
  %35 = load double, ptr %7, align 8, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret double %35
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"double", !7, i64 0}


; 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 nofree norecurse nosync nounwind willreturn memory(argmem: read) uwtable
define dso_local double @n_over_k(i32 noundef %0, i32 noundef %1, ptr nocapture noundef readonly %2) local_unnamed_addr #0 {
  %4 = icmp slt i32 %1, 0
  %.not = icmp sgt i32 %1, %0
  %or.cond = or i1 %4, %.not
  br i1 %or.cond, label %18, label %5

5:                                                ; preds = %3
  %6 = zext nneg i32 %0 to i64
  %7 = getelementptr inbounds double, ptr %2, i64 %6
  %8 = load double, ptr %7, align 8, !tbaa !5
  %9 = sub nsw i32 %0, %1
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds double, ptr %2, i64 %10
  %12 = load double, ptr %11, align 8, !tbaa !5
  %13 = zext nneg i32 %1 to i64
  %14 = getelementptr inbounds double, ptr %2, i64 %13
  %15 = load double, ptr %14, align 8, !tbaa !5
  %16 = fmul double %12, %15
  %17 = fdiv double %8, %16
  br label %18

18:                                               ; preds = %5, %3
  %.0 = phi double [ %17, %5 ], [ 0.000000e+00, %3 ]
  ret double %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass