; LLVM IR from koshkin-sergey/mbOS :: Device/ADI/ADuC7023/Driver (IRQ_ADUC7023)

; 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.IRQ_MODE_INFO_s = type { i32 }

@irq_mode = external hidden global %struct.IRQ_MODE_INFO_s, align 4

; 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 @IRQ_GetMode(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 %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %6 = load i32, ptr %3, align 4, !tbaa !5
  %7 = icmp slt i32 %6, 0
  br i1 %7, label %11, label %8

8:                                                ; preds = %1
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = icmp sge i32 %9, 22
  br i1 %10, label %11, label %12

11:                                               ; preds = %8, %1
  store i32 -2147483648, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %24

12:                                               ; preds = %8
  %13 = load i32, ptr @irq_mode, align 4, !tbaa !9
  %14 = zext i32 %13 to i64
  %15 = load i32, ptr %3, align 4, !tbaa !5
  %16 = zext i32 %15 to i64
  %17 = shl i64 1, %16
  %18 = and i64 %14, %17
  %19 = icmp eq i64 %18, 0
  br i1 %19, label %20, label %21

20:                                               ; preds = %12
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %22

21:                                               ; preds = %12
  store i32 8, ptr %4, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %21, %20
  %23 = load i32, ptr %4, align 4, !tbaa !5
  store i32 %23, ptr %2, align 4
  store i32 1, ptr %5, align 4
  br label %24

24:                                               ; preds = %22, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %25 = load i32, ptr %2, align 4
  ret i32 %25
}

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 = !{!10, !6, i64 0}
!10 = !{!"IRQ_MODE_INFO_s", !6, 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"

%struct.IRQ_MODE_INFO_s = type { i32 }

@irq_mode = external hidden local_unnamed_addr global %struct.IRQ_MODE_INFO_s, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, inaccessiblemem: none) uwtable
define dso_local range(i32 0, -2147483647) i32 @IRQ_GetMode(i32 noundef %0) local_unnamed_addr #0 {
  %or.cond = icmp ugt i32 %0, 21
  br i1 %or.cond, label %9, label %2

2:                                                ; preds = %1
  %3 = load i32, ptr @irq_mode, align 4, !tbaa !5
  %4 = zext i32 %3 to i64
  %5 = zext nneg i32 %0 to i64
  %6 = shl nuw nsw i64 1, %5
  %7 = and i64 %6, %4
  %8 = icmp eq i64 %7, 0
  %. = select i1 %8, i32 0, i32 8
  br label %9

9:                                                ; preds = %1, %2
  %.06 = phi i32 [ %., %2 ], [ -2147483648, %1 ]
  ret i32 %.06
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(read, argmem: none, 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 0}
!6 = !{!"IRQ_MODE_INFO_s", !7, i64 0}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass