; LLVM IR from devicehive/esp8266-firmware :: firmware-src/sources/DH (onewire)

; 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"

@mOneWirePin = external hidden global i32, align 4

; 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
declare hidden void @lock_int() #1

; Function Attrs: nounwind uwtable
declare hidden void @unlock_int() #1

; Function Attrs: nounwind uwtable
declare hidden i32 @onewire_act_byte(i32 noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @dh_onewire_read(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @lock_int()
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %7 = load i32, ptr @mOneWirePin, align 4, !tbaa !9
  %8 = zext i32 %7 to i64
  %9 = shl i64 1, %8
  %10 = trunc i64 %9 to i32
  store i32 %10, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %11, ptr %6, align 8, !tbaa !5
  br label %12

12:                                               ; preds = %16, %2
  %13 = load i32, ptr %4, align 4, !tbaa !9
  %14 = add i32 %13, -1
  store i32 %14, ptr %4, align 4, !tbaa !9
  %15 = icmp ne i32 %13, 0
  br i1 %15, label %16, label %22

16:                                               ; preds = %12
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = call i32 @onewire_act_byte(i32 noundef 255, i32 noundef %17)
  %19 = trunc i32 %18 to i8
  %20 = load ptr, ptr %6, align 8, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %20, i32 1
  store ptr %21, ptr %6, align 8, !tbaa !5
  store i8 %19, ptr %20, align 1, !tbaa !11
  br label %12, !llvm.loop !12

22:                                               ; preds = %12
  call void @unlock_int()
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 0
}

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 = !{!"int", !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"

@mOneWirePin = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nounwind uwtable
declare hidden void @lock_int() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden void @unlock_int() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare hidden i32 @onewire_act_byte(i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local noundef i32 @dh_onewire_read(ptr nocapture noundef writeonly %0, i32 noundef %1) local_unnamed_addr #0 {
  tail call void @lock_int()
  %3 = load i32, ptr @mOneWirePin, align 4, !tbaa !5
  %4 = zext nneg i32 %3 to i64
  %5 = shl nuw i64 1, %4
  %6 = trunc i64 %5 to i32
  %.not4 = icmp eq i32 %1, 0
  br i1 %.not4, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.06 = phi ptr [ %10, %.lr.ph ], [ %0, %2 ]
  %.035 = phi i32 [ %7, %.lr.ph ], [ %1, %2 ]
  %7 = add i32 %.035, -1
  %8 = tail call i32 @onewire_act_byte(i32 noundef 255, i32 noundef %6)
  %9 = trunc i32 %8 to i8
  %10 = getelementptr inbounds i8, ptr %.06, i64 1
  store i8 %9, ptr %.06, align 1, !tbaa !9
  %.not = icmp eq i32 %7, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !10

._crit_edge:                                      ; preds = %.lr.ph, %2
  tail call void @unlock_int()
  ret i32 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)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}


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