; LLVM IR from whoiswelliton/Computer_Engineering_UTFPR-PB :: Embedded_Systems/TIVA Connected TM4C1294XL Projects/00 - freeRTOS10_on_TIVA (xStreamBufferSpacesAvailable)

; 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"

%struct.StreamBufferDef_t = type { i64, i64, i64, i64, ptr, ptr, ptr, i8 }

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

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

; 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
define dso_local i64 @xStreamBufferSpacesAvailable(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  store ptr %5, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = icmp eq ptr %6, null
  br i1 %7, label %8, label %10

8:                                                ; preds = %1
  call void @vPortRaiseBASEPRI()
  br label %9

9:                                                ; preds = %9, %8
  br label %9

10:                                               ; preds = %1
  %11 = load ptr, ptr %3, align 8, !tbaa !5
  %12 = getelementptr inbounds %struct.StreamBufferDef_t, ptr %11, i32 0, i32 2
  %13 = load i64, ptr %12, align 8, !tbaa !9
  %14 = load ptr, ptr %3, align 8, !tbaa !5
  %15 = getelementptr inbounds %struct.StreamBufferDef_t, ptr %14, i32 0, i32 0
  %16 = load volatile i64, ptr %15, align 8, !tbaa !12
  %17 = add i64 %13, %16
  store i64 %17, ptr %4, align 8, !tbaa !13
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = getelementptr inbounds %struct.StreamBufferDef_t, ptr %18, i32 0, i32 1
  %20 = load volatile i64, ptr %19, align 8, !tbaa !14
  %21 = load i64, ptr %4, align 8, !tbaa !13
  %22 = sub i64 %21, %20
  store i64 %22, ptr %4, align 8, !tbaa !13
  %23 = load i64, ptr %4, align 8, !tbaa !13
  %24 = sub i64 %23, 1
  store i64 %24, ptr %4, align 8, !tbaa !13
  %25 = load i64, ptr %4, align 8, !tbaa !13
  %26 = load ptr, ptr %3, align 8, !tbaa !5
  %27 = getelementptr inbounds %struct.StreamBufferDef_t, ptr %26, i32 0, i32 2
  %28 = load i64, ptr %27, align 8, !tbaa !9
  %29 = icmp uge i64 %25, %28
  br i1 %29, label %30, label %36

30:                                               ; preds = %10
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = getelementptr inbounds %struct.StreamBufferDef_t, ptr %31, i32 0, i32 2
  %33 = load i64, ptr %32, align 8, !tbaa !9
  %34 = load i64, ptr %4, align 8, !tbaa !13
  %35 = sub i64 %34, %33
  store i64 %35, ptr %4, align 8, !tbaa !13
  br label %37

36:                                               ; preds = %10
  br label %37

37:                                               ; preds = %36, %30
  %38 = load i64, ptr %4, align 8, !tbaa !13
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  ret i64 %38
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { alwaysinline 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 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 16}
!10 = !{!"StreamBufferDef_t", !11, i64 0, !11, i64 8, !11, i64 16, !11, i64 24, !6, i64 32, !6, i64 40, !6, i64 48, !7, i64 56}
!11 = !{!"long", !7, i64 0}
!12 = !{!10, !11, i64 0}
!13 = !{!11, !11, i64 0}
!14 = !{!10, !11, i64 8}


; 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: alwaysinline nounwind uwtable
declare hidden void @vPortRaiseBASEPRI() local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i64 @xStreamBufferSpacesAvailable(ptr noundef %0) local_unnamed_addr #1 {
  %2 = icmp eq ptr %0, null
  br i1 %2, label %3, label %5

3:                                                ; preds = %1
  tail call void @vPortRaiseBASEPRI()
  br label %4

4:                                                ; preds = %4, %3
  br label %4

5:                                                ; preds = %1
  %6 = getelementptr inbounds i8, ptr %0, i64 16
  %7 = load i64, ptr %6, align 8, !tbaa !5
  %8 = load volatile i64, ptr %0, align 8, !tbaa !11
  %9 = add i64 %8, %7
  %10 = getelementptr inbounds i8, ptr %0, i64 8
  %11 = load volatile i64, ptr %10, align 8, !tbaa !12
  %12 = xor i64 %11, -1
  %13 = add i64 %9, %12
  %.not = icmp ult i64 %13, %7
  %14 = select i1 %.not, i64 0, i64 %7
  %spec.select = sub i64 %13, %14
  ret i64 %spec.select
}

attributes #0 = { alwaysinline 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 = { 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, !7, i64 16}
!6 = !{!"StreamBufferDef_t", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !10, i64 32, !10, i64 40, !10, i64 48, !8, i64 56}
!7 = !{!"long", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"any pointer", !8, i64 0}
!11 = !{!6, !7, i64 0}
!12 = !{!6, !7, i64 8}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass