; LLVM IR from Nonoum/ECL :: ECL_common (ECL_LogRoundUp)

; 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: nounwind uwtable
define dso_local zeroext i8 @ECL_LogRoundUp(i32 noundef %0) #0 {
  %2 = alloca i8, align 1
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i8, align 1
  %6 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #2
  %7 = load i32, ptr %3, align 4, !tbaa !5
  %8 = icmp ult i32 %7, 2
  br i1 %8, label %9, label %10

9:                                                ; preds = %1
  store i8 1, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %27

10:                                               ; preds = %1
  store i8 32, ptr %5, align 1, !tbaa !9
  store i32 1, ptr %4, align 4, !tbaa !5
  %11 = load i8, ptr %5, align 1, !tbaa !9
  %12 = zext i8 %11 to i32
  %13 = sub nsw i32 %12, 1
  %14 = load i32, ptr %4, align 4, !tbaa !5
  %15 = shl i32 %14, %13
  store i32 %15, ptr %4, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %20, %10
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = load i32, ptr %4, align 4, !tbaa !5
  %19 = icmp ule i32 %17, %18
  br i1 %19, label %20, label %25

20:                                               ; preds = %16
  %21 = load i32, ptr %4, align 4, !tbaa !5
  %22 = lshr i32 %21, 1
  store i32 %22, ptr %4, align 4, !tbaa !5
  %23 = load i8, ptr %5, align 1, !tbaa !9
  %24 = add i8 %23, -1
  store i8 %24, ptr %5, align 1, !tbaa !9
  br label %16, !llvm.loop !10

25:                                               ; preds = %16
  %26 = load i8, ptr %5, align 1, !tbaa !9
  store i8 %26, ptr %2, align 1
  store i32 1, ptr %6, align 4
  br label %27

27:                                               ; preds = %25, %9
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  %28 = load i8, ptr %2, align 1
  ret i8 %28
}

; 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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"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: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local zeroext i8 @ECL_LogRoundUp(i32 noundef %0) local_unnamed_addr #0 {
  %2 = icmp ult i32 %0, 2
  br i1 %2, label %.loopexit, label %.preheader

.preheader:                                       ; preds = %1
  %.not12 = icmp ugt i32 %0, -2147483648
  br i1 %.not12, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %.014 = phi i8 [ %4, %.lr.ph ], [ 32, %.preheader ]
  %.0913 = phi i32 [ %3, %.lr.ph ], [ -2147483648, %.preheader ]
  %3 = lshr i32 %.0913, 1
  %4 = add i8 %.014, -1
  %.not = icmp ult i32 %3, %0
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !5

.loopexit:                                        ; preds = %.lr.ph, %.preheader, %1
  %.010 = phi i8 [ 1, %1 ], [ 32, %.preheader ], [ %4, %.lr.ph ]
  ret i8 %.010
}

attributes #0 = { nofree norecurse nosync nounwind 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)"}
!5 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass