; LLVM IR from af-jk/rtos :: src (stos)

; 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.stos_kernel = type { ptr, ptr, ptr, ptr, %struct.stos_tcb }
%struct.stos_tcb = type { ptr, ptr, i32, i32, i32, i32, ptr, ptr }

@stos_ker = external hidden global %struct.stos_kernel, align 8

; Function Attrs: nounwind uwtable
define dso_local void @STOS_Sleep(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %3 = load i32, ptr %2, align 4, !tbaa !5
  %4 = load ptr, ptr getelementptr inbounds (%struct.stos_kernel, ptr @stos_ker, i32 0, i32 3), align 8, !tbaa !9
  %5 = getelementptr inbounds %struct.stos_tcb, ptr %4, i32 0, i32 5
  store i32 %3, ptr %5, align 4, !tbaa !13
  br label %6

6:                                                ; preds = %11, %1
  %7 = load ptr, ptr getelementptr inbounds (%struct.stos_kernel, ptr @stos_ker, i32 0, i32 3), align 8, !tbaa !9
  %8 = getelementptr inbounds %struct.stos_tcb, ptr %7, i32 0, i32 5
  %9 = load i32, ptr %8, align 4, !tbaa !13
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %6
  br label %6, !llvm.loop !14

12:                                               ; preds = %6
  ret void
}

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 = !{!10, !11, i64 24}
!10 = !{!"stos_kernel", !11, i64 0, !11, i64 8, !11, i64 16, !11, i64 24, !12, i64 32}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!"stos_tcb", !11, i64 0, !11, i64 8, !6, i64 16, !6, i64 20, !6, i64 24, !6, i64 28, !11, i64 32, !11, i64 40}
!13 = !{!12, !6, i64 28}
!14 = distinct !{!14, !15}
!15 = !{!"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"

%struct.stos_kernel = type { ptr, ptr, ptr, ptr, %struct.stos_tcb }
%struct.stos_tcb = type { ptr, ptr, i32, i32, i32, i32, ptr, ptr }

@stos_ker = external hidden local_unnamed_addr global %struct.stos_kernel, align 8

; Function Attrs: nofree norecurse nosync nounwind memory(readwrite, argmem: write, inaccessiblemem: none) uwtable
define dso_local void @STOS_Sleep(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load ptr, ptr getelementptr inbounds (i8, ptr @stos_ker, i64 24), align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 28
  store i32 %0, ptr %3, align 4, !tbaa !12
  %.not = icmp eq i32 %0, 0
  br i1 %.not, label %4, label %.split, !llvm.loop !13

.split:                                           ; preds = %1, %.split
  br label %.split

4:                                                ; preds = %1
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, argmem: write, inaccessiblemem: none) 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 24}
!6 = !{!"stos_kernel", !7, i64 0, !7, i64 8, !7, i64 16, !7, i64 24, !10, i64 32}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"stos_tcb", !7, i64 0, !7, i64 8, !11, i64 16, !11, i64 20, !11, i64 24, !11, i64 28, !7, i64 32, !7, i64 40}
!11 = !{!"int", !8, i64 0}
!12 = !{!10, !11, i64 28}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InstCombinePass,LICMPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass