; LLVM IR from Lakhankumawat/LearnCPP :: D-DivideAndConquerAlgorithms/Pow.ll (Z7myPow_hdi)

; 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: mustprogress uwtable
define dso_local noundef double @_Z7myPow_hdi(double noundef %0, i32 noundef %1) #0 {
  %3 = alloca double, align 8
  %4 = alloca double, align 8
  %5 = alloca i32, align 4
  %6 = alloca double, align 8
  %7 = alloca i32, align 4
  store double %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  %8 = load i32, ptr %5, align 4, !tbaa !9
  %9 = icmp eq i32 %8, 0
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store double 1.000000e+00, ptr %3, align 8
  br label %30

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %12 = load double, ptr %4, align 8, !tbaa !5
  %13 = load i32, ptr %5, align 4, !tbaa !9
  %14 = sdiv i32 %13, 2
  %15 = call noundef double @_Z7myPow_hdi(double noundef %12, i32 noundef %14)
  store double %15, ptr %6, align 8, !tbaa !5
  %16 = load i32, ptr %5, align 4, !tbaa !9
  %17 = srem i32 %16, 2
  %18 = icmp eq i32 %17, 0
  br i1 %18, label %19, label %23

19:                                               ; preds = %11
  %20 = load double, ptr %6, align 8, !tbaa !5
  %21 = load double, ptr %6, align 8, !tbaa !5
  %22 = fmul double %20, %21
  store double %22, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %29

23:                                               ; preds = %11
  %24 = load double, ptr %6, align 8, !tbaa !5
  %25 = load double, ptr %6, align 8, !tbaa !5
  %26 = fmul double %24, %25
  %27 = load double, ptr %4, align 8, !tbaa !5
  %28 = fmul double %26, %27
  store double %28, ptr %3, align 8
  store i32 1, ptr %7, align 4
  br label %29

29:                                               ; preds = %23, %19
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  br label %30

30:                                               ; preds = %29, %10
  %31 = load double, ptr %3, align 8
  ret double %31
}

; 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 = { mustprogress 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 = !{!"double", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}


; 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 nosync nounwind willreturn memory(none) uwtable
define dso_local noundef double @_Z7myPow_hdi(double noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %1, 0
  br i1 %3, label %common.ret10, label %4

common.ret10:                                     ; preds = %2, %4
  %common.ret10.op = phi double [ %.0, %4 ], [ 1.000000e+00, %2 ]
  ret double %common.ret10.op

4:                                                ; preds = %2
  %5 = sdiv i32 %1, 2
  %6 = tail call noundef double @_Z7myPow_hdi(double noundef %0, i32 noundef %5)
  %7 = and i32 %1, 1
  %8 = icmp eq i32 %7, 0
  %9 = fmul double %6, %6
  %10 = fmul double %9, %0
  %.0 = select i1 %8, double %9, double %10
  br label %common.ret10
}

attributes #0 = { mustprogress nofree 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,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass,TailCallElimPass