; LLVM IR from PX4/sapog :: bootloader/arch/src (libc)

; 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 willreturn memory(read) uwtable
define dso_local i32 @memcmp(ptr noundef nonnull %0, ptr noundef nonnull %1, i64 noundef %2) #1 {
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca i64, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i32, align 4
  store ptr %0, ptr %5, align 8, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !5
  store i64 %2, ptr %7, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %8) #2
  %11 = load ptr, ptr %5, align 8, !tbaa !5
  store ptr %11, ptr %8, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %9) #2
  %12 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %12, ptr %9, align 8, !tbaa !5
  br label %13

13:                                               ; preds = %36, %3
  %14 = load i64, ptr %7, align 8, !tbaa !9
  %15 = add i64 %14, -1
  store i64 %15, ptr %7, align 8, !tbaa !9
  %16 = icmp ugt i64 %14, 0
  br i1 %16, label %17, label %41

17:                                               ; preds = %13
  %18 = load ptr, ptr %8, align 8, !tbaa !5
  %19 = load i8, ptr %18, align 1, !tbaa !11
  %20 = zext i8 %19 to i32
  %21 = load ptr, ptr %9, align 8, !tbaa !5
  %22 = load i8, ptr %21, align 1, !tbaa !11
  %23 = zext i8 %22 to i32
  %24 = icmp slt i32 %20, %23
  br i1 %24, label %25, label %26

25:                                               ; preds = %17
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %42

26:                                               ; preds = %17
  %27 = load ptr, ptr %8, align 8, !tbaa !5
  %28 = load i8, ptr %27, align 1, !tbaa !11
  %29 = zext i8 %28 to i32
  %30 = load ptr, ptr %9, align 8, !tbaa !5
  %31 = load i8, ptr %30, align 1, !tbaa !11
  %32 = zext i8 %31 to i32
  %33 = icmp sgt i32 %29, %32
  br i1 %33, label %34, label %35

34:                                               ; preds = %26
  store i32 1, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %42

35:                                               ; preds = %26
  br label %36

36:                                               ; preds = %35
  %37 = load ptr, ptr %8, align 8, !tbaa !5
  %38 = getelementptr inbounds i8, ptr %37, i32 1
  store ptr %38, ptr %8, align 8, !tbaa !5
  %39 = load ptr, ptr %9, align 8, !tbaa !5
  %40 = getelementptr inbounds i8, ptr %39, i32 1
  store ptr %40, ptr %9, align 8, !tbaa !5
  br label %13, !llvm.loop !12

41:                                               ; preds = %13
  store i32 0, ptr %4, align 4
  store i32 1, ptr %10, align 4
  br label %42

42:                                               ; preds = %41, %34, %25
  call void @llvm.lifetime.end.p0(i64 8, ptr %9) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %8) #2
  %43 = load i32, ptr %4, align 4
  ret i32 %43
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind willreturn memory(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" }
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 = !{!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: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local range(i32 -1, 2) i32 @memcmp(ptr nocapture noundef nonnull readonly %0, ptr nocapture noundef nonnull readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %.not14 = icmp eq i64 %2, 0
  br i1 %.not14, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %10
  %.in = phi i64 [ %4, %10 ], [ %2, %3 ]
  %.016 = phi ptr [ %12, %10 ], [ %1, %3 ]
  %.0915 = phi ptr [ %11, %10 ], [ %0, %3 ]
  %4 = add i64 %.in, -1
  %5 = load i8, ptr %.0915, align 1, !tbaa !5
  %6 = load i8, ptr %.016, align 1, !tbaa !5
  %7 = icmp ult i8 %5, %6
  br i1 %7, label %._crit_edge, label %8

8:                                                ; preds = %.lr.ph
  %9 = icmp ugt i8 %5, %6
  br i1 %9, label %._crit_edge, label %10

10:                                               ; preds = %8
  %11 = getelementptr inbounds i8, ptr %.0915, i64 1
  %12 = getelementptr inbounds i8, ptr %.016, i64 1
  %.not = icmp eq i64 %4, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %8, %10, %3
  %.011 = phi i32 [ 0, %3 ], [ 0, %10 ], [ 1, %8 ], [ -1, %.lr.ph ]
  ret i32 %.011
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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, !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: EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass