; LLVM IR from tezc/sc :: sc (sc)

; 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"

; 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 i64 @sc_to_pow2(i64 noundef %0) #1 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  %5 = load i64, ptr %3, align 8, !tbaa !5
  %6 = icmp eq i64 %5, 0
  br i1 %6, label %7, label %8

7:                                                ; preds = %1
  store i64 1, ptr %2, align 8
  br label %30

8:                                                ; preds = %1
  %9 = load i64, ptr %3, align 8, !tbaa !5
  %10 = add i64 %9, -1
  store i64 %10, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 1, ptr %4, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %23, %8
  %12 = load i32, ptr %4, align 4, !tbaa !9
  %13 = zext i32 %12 to i64
  %14 = icmp ult i64 %13, 64
  br i1 %14, label %16, label %15

15:                                               ; preds = %11
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %26

16:                                               ; preds = %11
  %17 = load i64, ptr %3, align 8, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !9
  %19 = zext i32 %18 to i64
  %20 = lshr i64 %17, %19
  %21 = load i64, ptr %3, align 8, !tbaa !5
  %22 = or i64 %21, %20
  store i64 %22, ptr %3, align 8, !tbaa !5
  br label %23

23:                                               ; preds = %16
  %24 = load i32, ptr %4, align 4, !tbaa !9
  %25 = mul i32 %24, 2
  store i32 %25, ptr %4, align 4, !tbaa !9
  br label %11, !llvm.loop !11

26:                                               ; preds = %15
  %27 = load i64, ptr %3, align 8, !tbaa !5
  %28 = add i64 %27, 1
  store i64 %28, ptr %3, align 8, !tbaa !5
  %29 = load i64, ptr %3, align 8, !tbaa !5
  store i64 %29, ptr %2, align 8
  br label %30

30:                                               ; preds = %26, %7
  %31 = load i64, ptr %2, align 8
  ret i64 %31
}

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 = { 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local i64 @sc_to_pow2(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp eq i64 %0, 0
  br i1 %2, label %18, label %3

3:                                                ; preds = %1
  %4 = add i64 %0, -1
  %5 = lshr i64 %4, 1
  %6 = or i64 %5, %4
  %7 = lshr i64 %6, 2
  %8 = or i64 %7, %6
  %9 = lshr i64 %8, 4
  %10 = or i64 %9, %8
  %11 = lshr i64 %10, 8
  %12 = or i64 %11, %10
  %13 = lshr i64 %12, 16
  %14 = or i64 %13, %12
  %15 = lshr i64 %14, 32
  %16 = or i64 %15, %14
  %17 = add i64 %16, 1
  br label %18

18:                                               ; preds = %1, %3
  %.011 = phi i64 [ %17, %3 ], [ 1, %1 ]
  ret i64 %.011
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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)"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,LCSSAPass,LoopRotatePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass