; LLVM IR from tsotchke/quantum_rng :: examples/crypto (quantum_chain)

; 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"

%struct.QuantumChain = type { ptr, ptr, i64, [32 x i8] }
%struct.QuantumBlock = type { i64, i64, [64 x i8], [64 x i8], [64 x i8], i64, [1024 x i8], ptr }

; 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 ptr @quantum_chain_get_block(ptr noundef %0, i64 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = icmp ne ptr %7, null
  br i1 %8, label %9, label %15

9:                                                ; preds = %2
  %10 = load i64, ptr %5, align 8, !tbaa !9
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.QuantumChain, ptr %11, i32 0, i32 2
  %13 = load i64, ptr %12, align 8, !tbaa !11
  %14 = icmp uge i64 %10, %13
  br i1 %14, label %15, label %16

15:                                               ; preds = %9, %2
  store ptr null, ptr %3, align 8
  br label %37

16:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %17 = load ptr, ptr %4, align 8, !tbaa !5
  %18 = getelementptr inbounds %struct.QuantumChain, ptr %17, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !13
  store ptr %19, ptr %6, align 8, !tbaa !5
  br label %20

20:                                               ; preds = %31, %16
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = icmp ne ptr %21, null
  br i1 %22, label %23, label %29

23:                                               ; preds = %20
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = getelementptr inbounds %struct.QuantumBlock, ptr %24, i32 0, i32 0
  %26 = load i64, ptr %25, align 8, !tbaa !14
  %27 = load i64, ptr %5, align 8, !tbaa !9
  %28 = icmp ne i64 %26, %27
  br label %29

29:                                               ; preds = %23, %20
  %30 = phi i1 [ false, %20 ], [ %28, %23 ]
  br i1 %30, label %31, label %35

31:                                               ; preds = %29
  %32 = load ptr, ptr %6, align 8, !tbaa !5
  %33 = getelementptr inbounds %struct.QuantumBlock, ptr %32, i32 0, i32 7
  %34 = load ptr, ptr %33, align 8, !tbaa !16
  store ptr %34, ptr %6, align 8, !tbaa !5
  br label %20, !llvm.loop !17

35:                                               ; preds = %29
  %36 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %36, ptr %3, align 8
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %37

37:                                               ; preds = %35, %15
  %38 = load ptr, ptr %3, align 8
  ret ptr %38
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !10, i64 16}
!12 = !{!"", !6, i64 0, !6, i64 8, !10, i64 16, !7, i64 24}
!13 = !{!12, !6, i64 0}
!14 = !{!15, !10, i64 0}
!15 = !{!"QuantumBlock", !10, i64 0, !10, i64 8, !7, i64 16, !7, i64 80, !7, i64 144, !10, i64 208, !7, i64 216, !6, i64 1240}
!16 = !{!15, !6, i64 1240}
!17 = distinct !{!17, !18}
!18 = !{!"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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @quantum_chain_get_block(ptr noundef readonly %0, i64 noundef %1) local_unnamed_addr #0 {
  %.not = icmp eq ptr %0, null
  br i1 %.not, label %.critedge, label %3

3:                                                ; preds = %2
  %4 = getelementptr inbounds i8, ptr %0, i64 16
  %5 = load i64, ptr %4, align 8, !tbaa !5
  %.not12 = icmp ugt i64 %5, %1
  br i1 %.not12, label %.preheader, label %.critedge

.preheader:                                       ; preds = %3
  %.015 = load ptr, ptr %0, align 8, !tbaa !11
  %.not1316 = icmp eq ptr %.015, null
  br i1 %.not1316, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %7
  %.017 = phi ptr [ %.0, %7 ], [ %.015, %.preheader ]
  %6 = load i64, ptr %.017, align 8, !tbaa !12
  %.not14 = icmp eq i64 %6, %1
  br i1 %.not14, label %.critedge, label %7

7:                                                ; preds = %.lr.ph
  %8 = getelementptr inbounds i8, ptr %.017, i64 1240
  %.0 = load ptr, ptr %8, align 8, !tbaa !11
  %.not13 = icmp eq ptr %.0, null
  br i1 %.not13, label %.critedge, label %.lr.ph, !llvm.loop !14

.critedge:                                        ; preds = %7, %.lr.ph, %.preheader, %2, %3
  %.09 = phi ptr [ null, %3 ], [ null, %2 ], [ null, %.preheader ], [ null, %7 ], [ %.017, %.lr.ph ]
  ret ptr %.09
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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, !10, i64 16}
!6 = !{!"", !7, i64 0, !7, i64 8, !10, i64 16, !8, i64 24}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"long", !8, i64 0}
!11 = !{!7, !7, i64 0}
!12 = !{!13, !10, i64 0}
!13 = !{!"QuantumBlock", !10, i64 0, !10, i64 8, !8, i64 16, !8, i64 80, !8, i64 144, !10, i64 208, !8, i64 216, !7, i64 1240}
!14 = distinct !{!14, !15}
!15 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass