; LLVM IR from smwikipedia/EmbeddedAndRTOSSamples :: C2.6 (t)

; 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.uart = type { ptr, i32, [128 x i8], i32, i32, i32, i32, [128 x i8], i32, i32, i32, i32, i32 }

@uart = external global [4 x %struct.uart], align 16

; 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 void @IRQ_handler() #1 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %1) #3
  %2 = load i32, ptr inttoptr (i64 269746176 to ptr), align 4, !tbaa !5
  store i32 %2, ptr %1, align 4, !tbaa !5
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = and i32 %3, 4096
  %5 = icmp ne i32 %4, 0
  br i1 %5, label %6, label %7

6:                                                ; preds = %0
  call void @uart_handler(ptr noundef @uart)
  br label %7

7:                                                ; preds = %6, %0
  %8 = load i32, ptr %1, align 4, !tbaa !5
  %9 = and i32 %8, 8192
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %12

11:                                               ; preds = %7
  call void @uart_handler(ptr noundef getelementptr inbounds ([4 x %struct.uart], ptr @uart, i64 0, i64 1))
  br label %12

12:                                               ; preds = %11, %7
  call void @llvm.lifetime.end.p0(i64 4, ptr %1) #3
  ret void
}

declare void @uart_handler(ptr noundef) #2

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 = { "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 #3 = { 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"}


; 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.uart = type { ptr, i32, [128 x i8], i32, i32, i32, i32, [128 x i8], i32, i32, i32, i32, i32 }

@uart = external global [4 x %struct.uart], align 16

; Function Attrs: nounwind uwtable
define dso_local void @IRQ_handler() local_unnamed_addr #0 {
  %1 = load i32, ptr inttoptr (i64 269746176 to ptr), align 262144, !tbaa !5
  %2 = and i32 %1, 4096
  %.not = icmp eq i32 %2, 0
  br i1 %.not, label %4, label %3

3:                                                ; preds = %0
  tail call void @uart_handler(ptr noundef nonnull @uart) #2
  br label %4

4:                                                ; preds = %3, %0
  %5 = and i32 %1, 8192
  %.not2 = icmp eq i32 %5, 0
  br i1 %.not2, label %7, label %6

6:                                                ; preds = %4
  tail call void @uart_handler(ptr noundef nonnull getelementptr inbounds (i8, ptr @uart, i64 304)) #2
  br label %7

7:                                                ; preds = %6, %4
  ret void
}

declare void @uart_handler(ptr noundef) local_unnamed_addr #1

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" }
attributes #1 = { "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"}


; Effective O3 passes: GlobalOptPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,SROAPass,TailCallElimPass