; LLVM IR from QunShanHe/JLURoboVision :: Serial/Serial.ll (Z10UART0_SendiPci)

; 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"

@.str.21 = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

declare i32 @printf(ptr noundef, ...) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z10UART0_SendiPci(i32 noundef %0, ptr noundef %1, i32 noundef %2) #2 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  store i32 %0, ptr %5, align 4, !tbaa !5
  store ptr %1, ptr %6, align 8, !tbaa !9
  store i32 %2, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  store i32 0, ptr %8, align 4, !tbaa !5
  %10 = load i32, ptr %5, align 4, !tbaa !5
  %11 = load ptr, ptr %6, align 8, !tbaa !9
  %12 = load i32, ptr %7, align 4, !tbaa !5
  %13 = sext i32 %12 to i64
  %14 = call i64 @write(i32 noundef %10, ptr noundef %11, i64 noundef %13)
  %15 = trunc i64 %14 to i32
  store i32 %15, ptr %8, align 4, !tbaa !5
  %16 = load i32, ptr %8, align 4, !tbaa !5
  %17 = load i32, ptr %7, align 4, !tbaa !5
  %18 = icmp eq i32 %16, %17
  br i1 %18, label %19, label %23

19:                                               ; preds = %3
  %20 = load ptr, ptr %6, align 8, !tbaa !9
  %21 = call i32 (ptr, ...) @printf(ptr noundef @.str.21, ptr noundef %20)
  %22 = load i32, ptr %8, align 4, !tbaa !5
  store i32 %22, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %26

23:                                               ; preds = %3
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = call i32 @tcflush(i32 noundef %24, i32 noundef 1) #4
  store i32 -1, ptr %4, align 4
  store i32 1, ptr %9, align 4
  br label %26

26:                                               ; preds = %23, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  %27 = load i32, ptr %4, align 4
  ret i32 %27
}

; Function Attrs: nounwind
declare i32 @tcflush(i32 noundef, i32 noundef) #3

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 = { mustprogress 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 "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 #4 = { 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"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"

@.str.21 = external hidden unnamed_addr constant [17 x i8], align 1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z10UART0_SendiPci(i32 noundef %0, ptr noundef %1, i32 noundef %2) local_unnamed_addr #1 {
  %4 = sext i32 %2 to i64
  %5 = tail call i64 @write(i32 noundef %0, ptr noundef %1, i64 noundef %4)
  %6 = trunc i64 %5 to i32
  %7 = icmp eq i32 %6, %2
  br i1 %7, label %8, label %10

8:                                                ; preds = %3
  %9 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.21, ptr noundef %1)
  br label %12

10:                                               ; preds = %3
  %11 = tail call i32 @tcflush(i32 noundef %0, i32 noundef 1) #4
  br label %12

12:                                               ; preds = %10, %8
  %.0 = phi i32 [ %2, %8 ], [ -1, %10 ]
  ret i32 %.0
}

; Function Attrs: nounwind
declare i32 @tcflush(i32 noundef, i32 noundef) local_unnamed_addr #2

; Function Attrs: nofree
declare noundef i64 @write(i32 noundef, ptr nocapture noundef readonly, i64 noundef) local_unnamed_addr #3

attributes #0 = { nofree nounwind "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 = { mustprogress 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 "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 = { 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 #4 = { 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)"}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,TailCallElimPass