; LLVM IR from whoiswelliton/Computer_Engineering_UTFPR-PB :: Embedded_Systems/TIVA Connected TM4C1294XL Projects/01 - lwIP_HTTPServer_on_TIVA (wait)

; 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 i32 @osKernelSysTick() #1

declare i32 @osSemaphoreWait(ptr noundef, i32 noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @sys_arch_sem_wait(ptr noundef %0, i32 noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %8 = call i32 @osKernelSysTick()
  store i32 %8, ptr %6, align 4, !tbaa !9
  %9 = load i32, ptr %5, align 4, !tbaa !9
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %22

11:                                               ; preds = %2
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load ptr, ptr %12, align 8, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = call i32 @osSemaphoreWait(ptr noundef %13, i32 noundef %14)
  %16 = icmp eq i32 %15, 0
  br i1 %16, label %17, label %21

17:                                               ; preds = %11
  %18 = call i32 @osKernelSysTick()
  %19 = load i32, ptr %6, align 4, !tbaa !9
  %20 = sub i32 %18, %19
  store i32 %20, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %33

21:                                               ; preds = %11
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %33

22:                                               ; preds = %2
  br label %23

23:                                               ; preds = %28, %22
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = load ptr, ptr %24, align 8, !tbaa !5
  %26 = call i32 @osSemaphoreWait(ptr noundef %25, i32 noundef -1)
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %28, label %29

28:                                               ; preds = %23
  br label %23, !llvm.loop !11

29:                                               ; preds = %23
  %30 = call i32 @osKernelSysTick()
  %31 = load i32, ptr %6, align 4, !tbaa !9
  %32 = sub i32 %30, %31
  store i32 %32, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %33

33:                                               ; preds = %29, %21, %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %34 = load i32, ptr %3, align 4
  ret i32 %34
}

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 = !{!"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 = distinct !{!11, !12}
!12 = !{!"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"

declare i32 @osKernelSysTick() local_unnamed_addr #0

declare i32 @osSemaphoreWait(ptr noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local i32 @sys_arch_sem_wait(ptr nocapture noundef readonly %0, i32 noundef %1) local_unnamed_addr #1 {
  %3 = tail call i32 @osKernelSysTick() #2
  %.not = icmp eq i32 %1, 0
  br i1 %.not, label %.preheader, label %4

4:                                                ; preds = %2
  %5 = load ptr, ptr %0, align 8, !tbaa !5
  %6 = tail call i32 @osSemaphoreWait(ptr noundef %5, i32 noundef %1) #2
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %.sink.split, label %12

.preheader:                                       ; preds = %2, %.preheader
  %8 = load ptr, ptr %0, align 8, !tbaa !5
  %9 = tail call i32 @osSemaphoreWait(ptr noundef %8, i32 noundef -1) #2
  %.not7 = icmp eq i32 %9, 0
  br i1 %.not7, label %.sink.split, label %.preheader, !llvm.loop !9

.sink.split:                                      ; preds = %.preheader, %4
  %10 = tail call i32 @osKernelSysTick() #2
  %11 = sub i32 %10, %3
  br label %12

12:                                               ; preds = %.sink.split, %4
  %.0 = phi i32 [ -1, %4 ], [ %11, %.sink.split ]
  ret i32 %.0
}

attributes #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" }
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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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