; LLVM IR from indygreg/python-zstandard :: zstd (zstd)

; 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: 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: nounwind uwtable
define dso_local i64 @ZSTD_compressBound(i64 noundef %0) #1 {
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  store i64 %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #2
  %6 = load i64, ptr %3, align 8, !tbaa !5
  %7 = icmp uge i64 %6, -71777214294589696
  br i1 %7, label %8, label %9

8:                                                ; preds = %1
  br label %24

9:                                                ; preds = %1
  %10 = load i64, ptr %3, align 8, !tbaa !5
  %11 = load i64, ptr %3, align 8, !tbaa !5
  %12 = lshr i64 %11, 8
  %13 = add i64 %10, %12
  %14 = load i64, ptr %3, align 8, !tbaa !5
  %15 = icmp ult i64 %14, 131072
  br i1 %15, label %16, label %20

16:                                               ; preds = %9
  %17 = load i64, ptr %3, align 8, !tbaa !5
  %18 = sub i64 131072, %17
  %19 = lshr i64 %18, 11
  br label %21

20:                                               ; preds = %9
  br label %21

21:                                               ; preds = %20, %16
  %22 = phi i64 [ %19, %16 ], [ 0, %20 ]
  %23 = add i64 %13, %22
  br label %24

24:                                               ; preds = %21, %8
  %25 = phi i64 [ 0, %8 ], [ %23, %21 ]
  store i64 %25, ptr %4, align 8, !tbaa !5
  %26 = load i64, ptr %4, align 8, !tbaa !5
  %27 = icmp eq i64 %26, 0
  br i1 %27, label %28, label %29

28:                                               ; preds = %24
  store i64 -72, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %31

29:                                               ; preds = %24
  %30 = load i64, ptr %4, align 8, !tbaa !5
  store i64 %30, ptr %2, align 8
  store i32 1, ptr %5, align 4
  br label %31

31:                                               ; preds = %29, %28
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #2
  %32 = load i64, ptr %2, align 8
  ret i64 %32
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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(none) uwtable
define dso_local range(i64 1, 0) i64 @ZSTD_compressBound(i64 noundef %0) local_unnamed_addr #0 {
  %2 = icmp ugt i64 %0, -71777214294589697
  br i1 %2, label %.thread, label %3

3:                                                ; preds = %1
  %4 = lshr i64 %0, 8
  %5 = add nuw i64 %4, %0
  %6 = icmp ult i64 %0, 131072
  %7 = sub nuw nsw i64 131072, %0
  %8 = lshr i64 %7, 11
  %9 = select i1 %6, i64 %8, i64 0
  %10 = add i64 %5, %9
  %.fr = freeze i64 %10
  %11 = icmp eq i64 %.fr, 0
  br i1 %11, label %.thread, label %12

.thread:                                          ; preds = %1, %3
  br label %12

12:                                               ; preds = %3, %.thread
  %13 = phi i64 [ -72, %.thread ], [ %.fr, %3 ]
  ret i64 %13
}

attributes #0 = { mustprogress nofree norecurse 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: CorrelatedValuePropagationPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass