; LLVM IR from lolosssss/leetcode :: c (326_power_of_three)

; 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 i1 @isPowerOfThree(i32 noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca i32, align 4
  store i32 %0, ptr %3, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %13, %1
  %5 = load i32, ptr %3, align 4, !tbaa !5
  %6 = srem i32 %5, 3
  %7 = icmp eq i32 %6, 0
  br i1 %7, label %8, label %11

8:                                                ; preds = %4
  %9 = load i32, ptr %3, align 4, !tbaa !5
  %10 = icmp ne i32 %9, 0
  br label %11

11:                                               ; preds = %8, %4
  %12 = phi i1 [ false, %4 ], [ %10, %8 ]
  br i1 %12, label %13, label %16

13:                                               ; preds = %11
  %14 = load i32, ptr %3, align 4, !tbaa !5
  %15 = sdiv i32 %14, 3
  store i32 %15, ptr %3, align 4, !tbaa !5
  br label %4, !llvm.loop !9

16:                                               ; preds = %11
  %17 = load i32, ptr %3, align 4, !tbaa !5
  %18 = icmp eq i32 %17, 1
  br i1 %18, label %19, label %20

19:                                               ; preds = %16
  store i1 true, ptr %2, align 1
  br label %21

20:                                               ; preds = %16
  store i1 false, ptr %2, align 1
  br label %21

21:                                               ; preds = %20, %19
  %22 = load i1, ptr %2, align 1
  ret i1 %22
}

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" }

!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"

; Function Attrs: nofree norecurse nosync nounwind memory(none) uwtable
define dso_local zeroext i1 @isPowerOfThree(i32 noundef %0) local_unnamed_addr #0 {
  %2 = srem i32 %0, 3
  %3 = icmp eq i32 %2, 0
  %4 = icmp ne i32 %0, 0
  %5 = and i1 %4, %3
  br i1 %5, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.05 = phi i32 [ %6, %.lr.ph ], [ %0, %1 ]
  %6 = sdiv i32 %.05, 3
  %7 = srem i32 %6, 3
  %8 = icmp eq i32 %7, 0
  %9 = add i32 %.05, -3
  %10 = icmp ult i32 %9, -5
  %11 = and i1 %10, %8
  br i1 %11, label %.lr.ph, label %._crit_edge, !llvm.loop !5

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.0.lcssa = phi i32 [ %0, %1 ], [ %6, %.lr.ph ]
  %12 = icmp eq i32 %.0.lcssa, 1
  ret i1 %12
}

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: GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass