; LLVM IR from attractivechaos/klib :: test (kavl-lite_test)

; 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 void @shuffle(i32 noundef %0, ptr noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i8, align 1
  store i32 %0, ptr %3, align 4, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %8 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %8, ptr %5, align 4, !tbaa !5
  br label %9

9:                                                ; preds = %39, %2
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = icmp sgt i32 %10, 1
  br i1 %11, label %12, label %42

12:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 1, ptr %7) #3
  %13 = call double @drand48() #3
  %14 = load i32, ptr %5, align 4, !tbaa !5
  %15 = sitofp i32 %14 to double
  %16 = fmul double %13, %15
  %17 = fptosi double %16 to i32
  store i32 %17, ptr %6, align 4, !tbaa !5
  %18 = load ptr, ptr %4, align 8, !tbaa !9
  %19 = load i32, ptr %6, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds i8, ptr %18, i64 %20
  %22 = load i8, ptr %21, align 1, !tbaa !11
  store i8 %22, ptr %7, align 1, !tbaa !11
  %23 = load ptr, ptr %4, align 8, !tbaa !9
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = sub nsw i32 %24, 1
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i8, ptr %23, i64 %26
  %28 = load i8, ptr %27, align 1, !tbaa !11
  %29 = load ptr, ptr %4, align 8, !tbaa !9
  %30 = load i32, ptr %6, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds i8, ptr %29, i64 %31
  store i8 %28, ptr %32, align 1, !tbaa !11
  %33 = load i8, ptr %7, align 1, !tbaa !11
  %34 = load ptr, ptr %4, align 8, !tbaa !9
  %35 = load i32, ptr %5, align 4, !tbaa !5
  %36 = sub nsw i32 %35, 1
  %37 = sext i32 %36 to i64
  %38 = getelementptr inbounds i8, ptr %34, i64 %37
  store i8 %33, ptr %38, align 1, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 1, ptr %7) #3
  br label %39

39:                                               ; preds = %12
  %40 = load i32, ptr %5, align 4, !tbaa !5
  %41 = add nsw i32 %40, -1
  store i32 %41, ptr %5, align 4, !tbaa !5
  br label %9, !llvm.loop !12

42:                                               ; preds = %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

; Function Attrs: nounwind
declare double @drand48() #2

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 "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 = !{!"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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: nounwind uwtable
define dso_local void @shuffle(i32 noundef %0, ptr nocapture noundef %1) local_unnamed_addr #0 {
  %invariant.gep = getelementptr i8, ptr %1, i64 -1
  %3 = icmp sgt i32 %0, 1
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %4 = zext nneg i32 %0 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %4, %.lr.ph.preheader ], [ %indvars.iv.next, %.lr.ph ]
  %5 = tail call double @drand48() #2
  %6 = trunc nuw nsw i64 %indvars.iv to i32
  %7 = uitofp nneg i32 %6 to double
  %8 = fmul double %5, %7
  %9 = fptosi double %8 to i32
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds i8, ptr %1, i64 %10
  %12 = load i8, ptr %11, align 1, !tbaa !5
  %gep = getelementptr i8, ptr %invariant.gep, i64 %indvars.iv
  %13 = load i8, ptr %gep, align 1, !tbaa !5
  store i8 %13, ptr %11, align 1, !tbaa !5
  store i8 %12, ptr %gep, align 1, !tbaa !5
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %14 = icmp ugt i64 %indvars.iv, 2
  br i1 %14, label %.lr.ph, label %._crit_edge, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %2
  ret void
}

; Function Attrs: nounwind
declare double @drand48() local_unnamed_addr #1

attributes #0 = { 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 #1 = { nounwind "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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass