; LLVM IR from simonaertssen/MIT-6.172-Performance-Engineering-of-Software-Systems :: Week 4 Multicore programming/homework (queens)

; 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"

@count = external hidden global i32, align 4

; Function Attrs: nounwind uwtable
define dso_local void @try(i32 noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %9 = load i32, ptr %4, align 4, !tbaa !5
  %10 = icmp eq i32 %9, 255
  br i1 %10, label %11, label %14

11:                                               ; preds = %3
  %12 = load i32, ptr @count, align 4, !tbaa !5
  %13 = add nsw i32 %12, 1
  store i32 %13, ptr @count, align 4, !tbaa !5
  br label %46

14:                                               ; preds = %3
  %15 = load i32, ptr %4, align 4, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !5
  %17 = or i32 %15, %16
  %18 = load i32, ptr %6, align 4, !tbaa !5
  %19 = or i32 %17, %18
  %20 = xor i32 %19, -1
  %21 = and i32 %20, 255
  store i32 %21, ptr %7, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %25, %14
  %23 = load i32, ptr %7, align 4, !tbaa !5
  %24 = icmp ne i32 %23, 0
  br i1 %24, label %25, label %45

25:                                               ; preds = %22
  %26 = load i32, ptr %7, align 4, !tbaa !5
  %27 = load i32, ptr %7, align 4, !tbaa !5
  %28 = sub nsw i32 0, %27
  %29 = and i32 %26, %28
  store i32 %29, ptr %8, align 4, !tbaa !5
  %30 = load i32, ptr %4, align 4, !tbaa !5
  %31 = load i32, ptr %8, align 4, !tbaa !5
  %32 = or i32 %30, %31
  %33 = load i32, ptr %5, align 4, !tbaa !5
  %34 = load i32, ptr %8, align 4, !tbaa !5
  %35 = or i32 %33, %34
  %36 = shl i32 %35, 1
  %37 = load i32, ptr %6, align 4, !tbaa !5
  %38 = load i32, ptr %8, align 4, !tbaa !5
  %39 = or i32 %37, %38
  %40 = ashr i32 %39, 1
  call void @try(i32 noundef %32, i32 noundef %36, i32 noundef %40)
  %41 = load i32, ptr %8, align 4, !tbaa !5
  %42 = xor i32 %41, -1
  %43 = load i32, ptr %7, align 4, !tbaa !5
  %44 = and i32 %43, %42
  store i32 %44, ptr %7, align 4, !tbaa !5
  br label %22, !llvm.loop !9

45:                                               ; preds = %22
  br label %46

46:                                               ; preds = %45, %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = distinct !{!9, !10}
!10 = !{!"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"

@count = external hidden local_unnamed_addr global i32, align 4

; Function Attrs: nofree nosync nounwind memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @try(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp eq i32 %0, 255
  br i1 %4, label %5, label %8

5:                                                ; preds = %3
  %6 = load i32, ptr @count, align 4, !tbaa !5
  %7 = add nsw i32 %6, 1
  store i32 %7, ptr @count, align 4, !tbaa !5
  br label %.loopexit

8:                                                ; preds = %3
  %9 = or i32 %1, %0
  %10 = or i32 %9, %2
  %11 = and i32 %10, 255
  %.not16 = icmp eq i32 %11, 255
  br i1 %.not16, label %.loopexit, label %.lr.ph.preheader

.lr.ph.preheader:                                 ; preds = %8
  %12 = xor i32 %11, 255
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.lr.ph
  %.017 = phi i32 [ %20, %.lr.ph ], [ %12, %.lr.ph.preheader ]
  %13 = sub nsw i32 0, %.017
  %14 = and i32 %.017, %13
  %15 = or i32 %14, %0
  %16 = or i32 %14, %1
  %17 = shl i32 %16, 1
  %18 = or i32 %14, %2
  %19 = ashr i32 %18, 1
  tail call void @try(i32 noundef %15, i32 noundef %17, i32 noundef %19)
  %20 = xor i32 %14, %.017
  %.not = icmp eq i32 %14, %.017
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !9

.loopexit:                                        ; preds = %.lr.ph, %8, %5
  ret void
}

attributes #0 = { nofree nosync nounwind memory(readwrite, 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, !6, i64 0}
!6 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass