; LLVM IR from lfarcaro/ARINC653_ARMV7A_AM335X :: Hardware (dcan)

; 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

; Function Attrs: nounwind uwtable
define dso_local i32 @DCANTxRqstStatGet(i32 noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  store i32 1, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  br label %6

6:                                                ; preds = %29, %1
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp ult i32 %7, 128
  br i1 %8, label %9, label %32

9:                                                ; preds = %6
  %10 = load i32, ptr %3, align 4, !tbaa !5
  %11 = sub i32 %10, 1
  %12 = udiv i32 %11, 32
  store i32 %12, ptr %4, align 4, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !5
  %14 = sub i32 %13, 1
  %15 = urem i32 %14, 32
  store i32 %15, ptr %5, align 4, !tbaa !5
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = load i32, ptr %4, align 4, !tbaa !5
  %18 = mul i32 %17, 4
  %19 = add i32 136, %18
  %20 = add i32 %16, %19
  %21 = zext i32 %20 to i64
  %22 = inttoptr i64 %21 to ptr
  %23 = load volatile i32, ptr %22, align 4, !tbaa !5
  %24 = load i32, ptr %5, align 4, !tbaa !5
  %25 = shl i32 1, %24
  %26 = and i32 %23, %25
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %29, label %28

28:                                               ; preds = %9
  br label %32

29:                                               ; preds = %9
  %30 = load i32, ptr %3, align 4, !tbaa !5
  %31 = add i32 %30, 1
  store i32 %31, ptr %3, align 4, !tbaa !5
  br label %6, !llvm.loop !9

32:                                               ; preds = %28, %6
  %33 = load i32, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %33
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

; Function Attrs: nofree norecurse nounwind uwtable
define dso_local i32 @DCANTxRqstStatGet(i32 noundef %0) local_unnamed_addr #0 {
  %2 = add i32 %0, 136
  br label %3

3:                                                ; preds = %26, %1
  %.08 = phi i32 [ 1, %1 ], [ %27, %26 ]
  %4 = add nsw i32 %.08, -1
  %5 = and i32 %4, 31
  %6 = lshr i32 %4, 3
  %7 = and i32 %6, 536870908
  %8 = add i32 %2, %7
  %9 = zext i32 %8 to i64
  %10 = inttoptr i64 %9 to ptr
  %11 = load volatile i32, ptr %10, align 4, !tbaa !5
  %12 = shl nuw i32 1, %5
  %13 = and i32 %11, %12
  %.not = icmp eq i32 %13, 0
  br i1 %.not, label %28, label %14

14:                                               ; preds = %3
  %15 = add nuw nsw i32 %.08, 1
  %exitcond.not = icmp eq i32 %15, 128
  br i1 %exitcond.not, label %28, label %16, !llvm.loop !9

16:                                               ; preds = %14
  %17 = and i32 %.08, 31
  %18 = lshr i32 %.08, 3
  %19 = and i32 %18, 268435452
  %20 = add i32 %2, %19
  %21 = zext i32 %20 to i64
  %22 = inttoptr i64 %21 to ptr
  %23 = load volatile i32, ptr %22, align 4, !tbaa !5
  %24 = shl nuw i32 1, %17
  %25 = and i32 %23, %24
  %.not.1 = icmp eq i32 %25, 0
  br i1 %.not.1, label %28, label %26

26:                                               ; preds = %16
  %27 = add nuw nsw i32 %.08, 2
  br label %3

28:                                               ; preds = %16, %3, %14
  %.0.lcssa = phi i32 [ %.08, %3 ], [ 128, %14 ], [ %15, %16 ]
  ret i32 %.0.lcssa
}

attributes #0 = { nofree norecurse 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 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LICMPass,LoopRotatePass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass