; LLVM IR from embeddednirvana/A-Rudimentary-RTOS-for-Satellite-Control :: device (driver_pio)

; 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._AT91S_PIO = type { i32, i32, i32, [1 x i32], i32, i32, i32, [1 x i32], i32, i32, i32, [1 x i32], i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, i32, [1 x i32], i32, i32, i32, [1 x i32], i32, i32, i32, [9 x i32], i32, i32, i32 }
%struct._pio_port = type { i32 }

; Function Attrs: nounwind uwtable
define dso_local i32 @pio_input(ptr noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load volatile i32, ptr getelementptr inbounds (%struct._AT91S_PIO, ptr inttoptr (i64 4294964224 to ptr), i32 0, i32 15), align 4, !tbaa !9
  %5 = xor i32 %4, -1
  %6 = load ptr, ptr %3, align 8, !tbaa !5
  %7 = getelementptr inbounds %struct._pio_port, ptr %6, i32 0, i32 0
  %8 = load i32, ptr %7, align 4, !tbaa !12
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = getelementptr inbounds %struct._pio_port, ptr %9, i32 0, i32 0
  %11 = load i32, ptr %10, align 4, !tbaa !12
  %12 = icmp eq i32 %8, %11
  %13 = zext i1 %12 to i32
  %14 = and i32 %5, %13
  %15 = icmp ne i32 %14, 0
  br i1 %15, label %16, label %17

16:                                               ; preds = %1
  store i32 1, ptr %2, align 4
  br label %18

17:                                               ; preds = %1
  store i32 0, ptr %2, align 4
  br label %18

18:                                               ; preds = %17, %16
  %19 = load i32, ptr %2, align 4
  ret i32 %19
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !11, i64 60}
!10 = !{!"_AT91S_PIO", !11, i64 0, !11, i64 4, !11, i64 8, !7, i64 12, !11, i64 16, !11, i64 20, !11, i64 24, !7, i64 28, !11, i64 32, !11, i64 36, !11, i64 40, !7, i64 44, !11, i64 48, !11, i64 52, !11, i64 56, !11, i64 60, !11, i64 64, !11, i64 68, !11, i64 72, !11, i64 76, !11, i64 80, !11, i64 84, !11, i64 88, !7, i64 92, !11, i64 96, !11, i64 100, !11, i64 104, !7, i64 108, !11, i64 112, !11, i64 116, !11, i64 120, !7, i64 124, !11, i64 160, !11, i64 164, !11, i64 168}
!11 = !{!"int", !7, i64 0}
!12 = !{!13, !11, i64 0}
!13 = !{!"_pio_port", !11, 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 range(i32 0, 2) i32 @pio_input(ptr nocapture noundef readnone %0) local_unnamed_addr #0 {
  %2 = load volatile i32, ptr inttoptr (i64 4294964284 to ptr), align 4, !tbaa !5
  %3 = and i32 %2, 1
  %. = xor i32 %3, 1
  ret i32 %.
}

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 60}
!6 = !{!"_AT91S_PIO", !7, i64 0, !7, i64 4, !7, i64 8, !8, i64 12, !7, i64 16, !7, i64 20, !7, i64 24, !8, i64 28, !7, i64 32, !7, i64 36, !7, i64 40, !8, i64 44, !7, i64 48, !7, i64 52, !7, i64 56, !7, i64 60, !7, i64 64, !7, i64 68, !7, i64 72, !7, i64 76, !7, i64 80, !7, i64 84, !7, i64 88, !8, i64 92, !7, i64 96, !7, i64 100, !7, i64 104, !8, i64 108, !7, i64 112, !7, i64 116, !7, i64 120, !8, i64 124, !7, i64 160, !7, i64 164, !7, i64 168}
!7 = !{!"int", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}


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