; LLVM IR from graycatlabs/serbus :: src (i2cdriver)

; 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

declare i64 @read(i32 noundef, ptr noundef, i64 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @I2C_readTransaction(i32 noundef %0, i8 noundef zeroext %1, ptr noundef %2, i32 noundef %3) #2 {
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i8, align 1
  %8 = alloca ptr, align 8
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  %11 = alloca i32, align 4
  store i32 %0, ptr %6, align 4, !tbaa !5
  store i8 %1, ptr %7, align 1, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !10
  store i32 %3, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #3
  %12 = load i32, ptr %6, align 4, !tbaa !5
  %13 = call i64 @write(i32 noundef %12, ptr noundef %7, i64 noundef 1)
  %14 = trunc i64 %13 to i32
  store i32 %14, ptr %10, align 4, !tbaa !5
  %15 = load i32, ptr %10, align 4, !tbaa !5
  %16 = icmp slt i32 %15, 0
  br i1 %16, label %17, label %19

17:                                               ; preds = %4
  %18 = load i32, ptr %10, align 4, !tbaa !5
  store i32 %18, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %31

19:                                               ; preds = %4
  %20 = load i32, ptr %6, align 4, !tbaa !5
  %21 = load ptr, ptr %8, align 8, !tbaa !10
  %22 = load i32, ptr %9, align 4, !tbaa !5
  %23 = sext i32 %22 to i64
  %24 = call i64 @read(i32 noundef %20, ptr noundef %21, i64 noundef %23)
  %25 = trunc i64 %24 to i32
  store i32 %25, ptr %10, align 4, !tbaa !5
  %26 = load i32, ptr %10, align 4, !tbaa !5
  %27 = icmp slt i32 %26, 0
  br i1 %27, label %28, label %30

28:                                               ; preds = %19
  %29 = load i32, ptr %10, align 4, !tbaa !5
  store i32 %29, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %31

30:                                               ; preds = %19
  store i32 0, ptr %5, align 4
  store i32 1, ptr %11, align 4
  br label %31

31:                                               ; preds = %30, %28, %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #3
  %32 = load i32, ptr %5, align 4
  ret i32 %32
}

declare i64 @write(i32 noundef, ptr noundef, i64 noundef) #1

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { "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 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 #3 = { 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"}
!9 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"any pointer", !7, i64 0}


; 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
declare noundef i64 @read(i32 noundef, ptr nocapture noundef, i64 noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind uwtable
define dso_local range(i32 -2147483648, 1) i32 @I2C_readTransaction(i32 noundef %0, i8 noundef zeroext %1, ptr nocapture noundef %2, i32 noundef %3) local_unnamed_addr #1 {
  %5 = alloca i8, align 1
  store i8 %1, ptr %5, align 1, !tbaa !5
  %6 = call i64 @write(i32 noundef %0, ptr noundef nonnull %5, i64 noundef 1) #3
  %7 = trunc i64 %6 to i32
  %8 = icmp slt i32 %7, 0
  br i1 %8, label %13, label %9

9:                                                ; preds = %4
  %10 = sext i32 %3 to i64
  %11 = tail call i64 @read(i32 noundef %0, ptr noundef %2, i64 noundef %10) #3
  %12 = trunc i64 %11 to i32
  %. = tail call i32 @llvm.smin.i32(i32 %12, i32 0)
  br label %13

13:                                               ; preds = %9, %4
  %.0 = phi i32 [ %7, %4 ], [ %., %9 ]
  ret i32 %.0
}

; Function Attrs: nofree
declare noundef i64 @write(i32 noundef, ptr nocapture noundef readonly, i64 noundef) local_unnamed_addr #0

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smin.i32(i32, i32) #2

attributes #0 = { nofree "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 = { nofree 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #3 = { 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


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