; LLVM IR from ritikbanger/Hacktoberfest2022-DSA :: 05. Searching/Find the position of element in an infinite sorted array.ll (Z8positionPii)

; 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
declare dso_local noundef i32 @_Z12BinarySearchPiiii(ptr noundef, i32 noundef, i32 noundef, i32 noundef) #0

; 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

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8positionPii(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  store i32 0, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %7

7:                                                ; preds = %15, %2
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = load i32, ptr %6, align 4, !tbaa !9
  %11 = sext i32 %10 to i64
  %12 = getelementptr inbounds i32, ptr %9, i64 %11
  %13 = load i32, ptr %12, align 4, !tbaa !9
  %14 = icmp sgt i32 %8, %13
  br i1 %14, label %15, label %19

15:                                               ; preds = %7
  %16 = load i32, ptr %6, align 4, !tbaa !9
  store i32 %16, ptr %5, align 4, !tbaa !9
  %17 = load i32, ptr %6, align 4, !tbaa !9
  %18 = mul nsw i32 %17, 2
  store i32 %18, ptr %6, align 4, !tbaa !9
  br label %7, !llvm.loop !11

19:                                               ; preds = %7
  %20 = load ptr, ptr %3, align 8, !tbaa !5
  %21 = load i32, ptr %5, align 4, !tbaa !9
  %22 = load i32, ptr %6, align 4, !tbaa !9
  %23 = load i32, ptr %4, align 4, !tbaa !9
  %24 = call noundef i32 @_Z12BinarySearchPiiii(ptr noundef %20, i32 noundef %21, i32 noundef %22, i32 noundef %23)
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret i32 %24
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple 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 uwtable
declare dso_local noundef i32 @_Z12BinarySearchPiiii(ptr noundef, i32 noundef, i32 noundef, i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_Z8positionPii(ptr noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  br label %3

3:                                                ; preds = %3, %2
  %.08 = phi i32 [ 0, %2 ], [ %.0, %3 ]
  %.0 = phi i32 [ 1, %2 ], [ %8, %3 ]
  %4 = zext nneg i32 %.0 to i64
  %5 = getelementptr inbounds i32, ptr %0, i64 %4
  %6 = load i32, ptr %5, align 4, !tbaa !5
  %7 = icmp slt i32 %6, %1
  %8 = shl nsw i32 %.0, 1
  br i1 %7, label %3, label %9, !llvm.loop !9

9:                                                ; preds = %3
  %10 = tail call noundef i32 @_Z12BinarySearchPiiii(ptr noundef nonnull %0, i32 noundef %.08, i32 noundef %.0, i32 noundef %1)
  ret i32 %10
}

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" }

!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++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: CorrelatedValuePropagationPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopRotatePass,LoopUnrollPass,SROAPass,TailCallElimPass