; 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 @strncmp(ptr noundef nonnull %0, ptr noundef nonnull %1, i64 noundef %2) #1 {
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  store i64 %2, ptr %6, align 8, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 0, ptr %7, align 4, !tbaa !11
  br label %8

8:                                                ; preds = %28, %3
  %9 = load i64, ptr %6, align 8, !tbaa !9
  %10 = icmp ugt i64 %9, 0
  br i1 %10, label %11, label %31

11:                                               ; preds = %8
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load i8, ptr %12, align 1, !tbaa !13
  %14 = sext i8 %13 to i32
  %15 = load ptr, ptr %5, align 8, !tbaa !5
  %16 = getelementptr inbounds i8, ptr %15, i32 1
  store ptr %16, ptr %5, align 8, !tbaa !5
  %17 = load i8, ptr %15, align 1, !tbaa !13
  %18 = sext i8 %17 to i32
  %19 = sub nsw i32 %14, %18
  store i32 %19, ptr %7, align 4, !tbaa !11
  %20 = icmp ne i32 %19, 0
  br i1 %20, label %26, label %21

21:                                               ; preds = %11
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %22, i32 1
  store ptr %23, ptr %4, align 8, !tbaa !5
  %24 = load i8, ptr %22, align 1, !tbaa !13
  %25 = icmp ne i8 %24, 0
  br i1 %25, label %27, label %26

26:                                               ; preds = %21, %11
  br label %31

27:                                               ; preds = %21
  br label %28

28:                                               ; preds = %27
  %29 = load i64, ptr %6, align 8, !tbaa !9
  %30 = add i64 %29, -1
  store i64 %30, ptr %6, align 8, !tbaa !9
  br label %8, !llvm.loop !14

31:                                               ; preds = %26, %8
  %32 = load i32, ptr %7, align 4, !tbaa !11
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret i32 %32
}

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 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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 -255, 256) i32 @strncmp(ptr nocapture noundef nonnull readonly %0, ptr nocapture noundef nonnull readonly %1, i64 noundef %2) local_unnamed_addr #0 {
  %.not12 = icmp eq i64 %2, 0
  br i1 %.not12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %3, %9
  %.0515 = phi i64 [ %12, %9 ], [ %2, %3 ]
  %.0614 = phi ptr [ %10, %9 ], [ %1, %3 ]
  %.0713 = phi ptr [ %11, %9 ], [ %0, %3 ]
  %4 = load i8, ptr %.0713, align 1, !tbaa !5
  %5 = sext i8 %4 to i32
  %6 = load i8, ptr %.0614, align 1, !tbaa !5
  %7 = sext i8 %6 to i32
  %8 = sub nsw i32 %5, %7
  %.not10 = icmp eq i32 %8, 0
  br i1 %.not10, label %9, label %._crit_edge

9:                                                ; preds = %.lr.ph
  %10 = getelementptr inbounds i8, ptr %.0614, i64 1
  %.not11 = icmp eq i8 %4, 0
  %11 = getelementptr inbounds i8, ptr %.0713, i64 1
  %12 = add i64 %.0515, -1
  %.not = icmp eq i64 %12, 0
  %or.cond = select i1 %.not11, i1 true, i1 %.not
  br i1 %or.cond, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %9, %.lr.ph, %3
  %.1 = phi i32 [ 0, %3 ], [ %8, %.lr.ph ], [ 0, %9 ]
  ret i32 %.1
}

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