; LLVM IR from googlecreativelab/open-nsynth-super :: app/open-nsynth/src/Gpio.ll (ZN4Gpio4readEi)

; 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"

%class.Gpio = type { ptr }

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_ZN4Gpio4readEi(ptr noundef nonnull align 8 dereferenceable(8) %0, i32 noundef %1) #0 align 2 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %6 = load ptr, ptr %4, align 8
  %7 = getelementptr inbounds %class.Gpio, ptr %6, i32 0, i32 0
  %8 = load ptr, ptr %7, align 8, !tbaa !11
  %9 = icmp ne ptr %8, null
  br i1 %9, label %10, label %16

10:                                               ; preds = %2
  %11 = load i32, ptr %5, align 4, !tbaa !9
  %12 = icmp slt i32 %11, 2
  br i1 %12, label %16, label %13

13:                                               ; preds = %10
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = icmp sgt i32 %14, 27
  br i1 %15, label %16, label %17

16:                                               ; preds = %13, %10, %2
  store i1 false, ptr %3, align 1
  br label %27

17:                                               ; preds = %13
  %18 = getelementptr inbounds %class.Gpio, ptr %6, i32 0, i32 0
  %19 = load ptr, ptr %18, align 8, !tbaa !11
  %20 = getelementptr inbounds i32, ptr %19, i64 13
  %21 = load volatile i32, ptr %20, align 4, !tbaa !9
  %22 = load i32, ptr %5, align 4, !tbaa !9
  %23 = and i32 %22, 31
  %24 = shl i32 1, %23
  %25 = and i32 %21, %24
  %26 = icmp ne i32 %25, 0
  store i1 %26, ptr %3, align 1
  br label %27

27:                                               ; preds = %17, %16
  %28 = load i1, ptr %3, align 1
  ret i1 %28
}

attributes #0 = { mustprogress 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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !6, i64 0}
!12 = !{!"_ZTS4Gpio", !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"

; Function Attrs: mustprogress nofree norecurse nounwind willreturn uwtable
define dso_local noundef zeroext i1 @_ZN4Gpio4readEi(ptr nocapture noundef nonnull readonly align 8 dereferenceable(8) %0, i32 noundef %1) local_unnamed_addr #0 align 2 {
  %3 = load ptr, ptr %0, align 8, !tbaa !5
  %4 = icmp eq ptr %3, null
  %5 = add i32 %1, -28
  %6 = icmp ult i32 %5, -26
  %or.cond3 = or i1 %6, %4
  br i1 %or.cond3, label %13, label %7

7:                                                ; preds = %2
  %8 = getelementptr inbounds i8, ptr %3, i64 52
  %9 = load volatile i32, ptr %8, align 4, !tbaa !10
  %10 = shl nuw nsw i32 1, %1
  %11 = and i32 %9, %10
  %12 = icmp ne i32 %11, 0
  br label %13

13:                                               ; preds = %2, %7
  %.0 = phi i1 [ %12, %7 ], [ false, %2 ]
  ret i1 %.0
}

attributes #0 = { mustprogress nofree norecurse nounwind willreturn 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 = !{!"_ZTS4Gpio", !7, i64 0}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!11, !11, i64 0}
!11 = !{!"int", !8, i64 0}


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