; LLVM IR from MiRoboticsLab/cyberdog_ros2 :: cyberdog_common/cyberdog_utils/src/can (socket_can_common)

; 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.fd_set = type { [16 x i64] }

; 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: mustprogress nounwind uwtable
define dso_local void @_ZN7drivers9socketcan10single_setEi(ptr dead_on_unwind noalias writable sret(%struct.fd_set) align 8 %0, i32 noundef %1) #1 {
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  store i32 %1, ptr %3, align 4, !tbaa !5
  br label %6

6:                                                ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #2
  store ptr %0, ptr %5, align 8, !tbaa !9
  store i32 0, ptr %4, align 4, !tbaa !5
  br label %7

7:                                                ; preds = %17, %6
  %8 = load i32, ptr %4, align 4, !tbaa !5
  %9 = zext i32 %8 to i64
  %10 = icmp ult i64 %9, 16
  br i1 %10, label %11, label %20

11:                                               ; preds = %7
  %12 = load ptr, ptr %5, align 8, !tbaa !9
  %13 = getelementptr inbounds %struct.fd_set, ptr %12, i32 0, i32 0
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = zext i32 %14 to i64
  %16 = getelementptr inbounds [16 x i64], ptr %13, i64 0, i64 %15
  store i64 0, ptr %16, align 8, !tbaa !11
  br label %17

17:                                               ; preds = %11
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = add i32 %18, 1
  store i32 %19, ptr %4, align 4, !tbaa !5
  br label %7, !llvm.loop !13

20:                                               ; preds = %7
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %21

21:                                               ; preds = %20
  br label %22

22:                                               ; preds = %21
  %23 = load i32, ptr %3, align 4, !tbaa !5
  %24 = srem i32 %23, 64
  %25 = zext i32 %24 to i64
  %26 = shl i64 1, %25
  %27 = getelementptr inbounds %struct.fd_set, ptr %0, i32 0, i32 0
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = sdiv i32 %28, 64
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [16 x i64], ptr %27, i64 0, i64 %30
  %32 = load i64, ptr %31, align 8, !tbaa !11
  %33 = or i64 %32, %26
  store i64 %33, ptr %31, align 8, !tbaa !11
  ret void
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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" }
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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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"

%struct.fd_set = type { [16 x i64] }

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) uwtable
define dso_local void @_ZN7drivers9socketcan10single_setEi(ptr dead_on_unwind noalias nocapture writable sret(%struct.fd_set) align 8 %0, i32 noundef %1) local_unnamed_addr #0 {
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 8 dereferenceable(128) %0, i8 0, i64 128, i1 false), !tbaa !5
  %3 = srem i32 %1, 64
  %4 = zext nneg i32 %3 to i64
  %5 = shl nuw i64 1, %4
  %6 = sdiv i32 %1, 64
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds [16 x i64], ptr %0, i64 0, i64 %7
  %9 = load i64, ptr %8, align 8, !tbaa !5
  %10 = or i64 %9, %5
  store i64 %10, ptr %8, align 8, !tbaa !5
  ret void
}

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: readwrite) 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 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,LoopIdiomRecognizePass,LoopRotatePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass