; LLVM IR from sp-nitech/SPTK :: third_party/SWIPE/vector.ll (ZN4sptk5swipe8bisectivENS0_9intvectorEi)

; 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"

%"struct.sptk::swipe::intvector" = type { i32, ptr }

; 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: mustprogress nounwind uwtable
define dso_local noundef i32 @_ZN4sptk5swipe8bisectivENS0_9intvectorEi(i32 %0, ptr %1, i32 noundef %2) #1 {
  %4 = alloca %"struct.sptk::swipe::intvector", align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = getelementptr inbounds { i32, ptr }, ptr %4, i32 0, i32 0
  store i32 %0, ptr %9, align 8
  %10 = getelementptr inbounds { i32, ptr }, ptr %4, i32 0, i32 1
  store ptr %1, ptr %10, align 8
  store i32 %2, ptr %5, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  store i32 1, ptr %7, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #2
  %11 = getelementptr inbounds %"struct.sptk::swipe::intvector", ptr %4, i32 0, i32 0
  %12 = load i32, ptr %11, align 8, !tbaa !9
  store i32 %12, ptr %8, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %35, %3
  %14 = load i32, ptr %8, align 4, !tbaa !5
  %15 = load i32, ptr %7, align 4, !tbaa !5
  %16 = sub nsw i32 %14, %15
  %17 = icmp sgt i32 %16, 1
  br i1 %17, label %18, label %36

18:                                               ; preds = %13
  %19 = load i32, ptr %8, align 4, !tbaa !5
  %20 = load i32, ptr %7, align 4, !tbaa !5
  %21 = add nsw i32 %19, %20
  %22 = ashr i32 %21, 1
  store i32 %22, ptr %6, align 4, !tbaa !5
  %23 = getelementptr inbounds %"struct.sptk::swipe::intvector", ptr %4, i32 0, i32 1
  %24 = load ptr, ptr %23, align 8, !tbaa !12
  %25 = load i32, ptr %6, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds i32, ptr %24, i64 %26
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = load i32, ptr %5, align 4, !tbaa !5
  %30 = icmp sgt i32 %28, %29
  br i1 %30, label %31, label %33

31:                                               ; preds = %18
  %32 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %32, ptr %8, align 4, !tbaa !5
  br label %35

33:                                               ; preds = %18
  %34 = load i32, ptr %6, align 4, !tbaa !5
  store i32 %34, ptr %7, align 4, !tbaa !5
  br label %35

35:                                               ; preds = %33, %31
  br label %13, !llvm.loop !13

36:                                               ; preds = %13
  %37 = load i32, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  ret i32 %37
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 0}
!10 = !{!"_ZTSN4sptk5swipe9intvectorE", !6, i64 0, !11, i64 8}
!11 = !{!"any pointer", !7, i64 0}
!12 = !{!10, !11, i64 8}
!13 = distinct !{!13, !14}
!14 = !{!"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(argmem: read) uwtable
define dso_local noundef i32 @_ZN4sptk5swipe8bisectivENS0_9intvectorEi(i32 %0, ptr nocapture readonly %1, i32 noundef %2) local_unnamed_addr #0 {
  %4 = icmp sgt i32 %0, 2
  br i1 %4, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %3, %.lr.ph
  %.012 = phi i32 [ %..0, %.lr.ph ], [ %0, %3 ]
  %.0911 = phi i32 [ %.09., %.lr.ph ], [ 1, %3 ]
  %5 = add nsw i32 %.012, %.0911
  %6 = ashr i32 %5, 1
  %7 = sext i32 %6 to i64
  %8 = getelementptr inbounds i32, ptr %1, i64 %7
  %9 = load i32, ptr %8, align 4, !tbaa !5
  %10 = icmp sgt i32 %9, %2
  %.09. = select i1 %10, i32 %.0911, i32 %6
  %..0 = select i1 %10, i32 %6, i32 %.012
  %11 = sub nsw i32 %..0, %.09.
  %12 = icmp sgt i32 %11, 1
  br i1 %12, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %3
  %.0.lcssa = phi i32 [ %0, %3 ], [ %..0, %.lr.ph ]
  ret i32 %.0.lcssa
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass