; LLVM IR from sca-secure-library-sca25519/sca25519 :: libopencm3/lib/cm3 (systick)

; 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: nounwind uwtable
declare dso_local void @systick_set_reload(i32 noundef) #0

; Function Attrs: nounwind uwtable
define dso_local zeroext i1 @systick_set_frequency(i32 noundef %0, i32 noundef %1) #0 {
  %3 = alloca i1, align 1
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %8 = load i32, ptr %5, align 4, !tbaa !5
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = udiv i32 %8, %9
  store i32 %10, ptr %6, align 4, !tbaa !5
  %11 = load i32, ptr %6, align 4, !tbaa !5
  %12 = icmp uge i32 %11, 134217720
  br i1 %12, label %13, label %14

13:                                               ; preds = %2
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %25

14:                                               ; preds = %2
  %15 = load i32, ptr %6, align 4, !tbaa !5
  %16 = icmp uge i32 %15, 16777215
  br i1 %16, label %17, label %20

17:                                               ; preds = %14
  %18 = load i32, ptr %6, align 4, !tbaa !5
  %19 = udiv i32 %18, 8
  store i32 %19, ptr %6, align 4, !tbaa !5
  call void @systick_set_clocksource(i8 noundef zeroext 0)
  br label %21

20:                                               ; preds = %14
  call void @systick_set_clocksource(i8 noundef zeroext 4)
  br label %21

21:                                               ; preds = %20, %17
  br label %22

22:                                               ; preds = %21
  %23 = load i32, ptr %6, align 4, !tbaa !5
  %24 = sub i32 %23, 1
  call void @systick_set_reload(i32 noundef %24)
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %25

25:                                               ; preds = %22, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %26 = load i1, ptr %3, align 1
  ret i1 %26
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare dso_local void @systick_set_clocksource(i8 noundef zeroext) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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"}


; 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
declare dso_local void @systick_set_reload(i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef zeroext i1 @systick_set_frequency(i32 noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = udiv i32 %1, %0
  %4 = icmp ult i32 %3, 134217720
  br i1 %4, label %5, label %9

5:                                                ; preds = %2
  %6 = icmp ugt i32 %3, 16777214
  %7 = lshr i32 %3, 3
  %.sink = select i1 %6, i8 0, i8 4
  %.0 = select i1 %6, i32 %7, i32 %3
  tail call void @systick_set_clocksource(i8 noundef zeroext %.sink)
  %8 = add nsw i32 %.0, -1
  tail call void @systick_set_reload(i32 noundef %8)
  br label %9

9:                                                ; preds = %2, %5
  ret i1 %4
}

; Function Attrs: nounwind uwtable
declare dso_local void @systick_set_clocksource(i8 noundef zeroext) local_unnamed_addr #0

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" }

!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)"}


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