; 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: inlinehint nounwind uwtable
declare hidden i32 @MEM_readLE32(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @ZSTD_isFrame(ptr noundef %0, i64 noundef %1) #2 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i64 %1, ptr %5, align 8, !tbaa !9
  %8 = load i64, ptr %5, align 8, !tbaa !9
  %9 = icmp ult i64 %8, 4
  br i1 %9, label %10, label %11

10:                                               ; preds = %2
  store i32 0, ptr %3, align 4
  br label %26

11:                                               ; preds = %2
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = call i32 @MEM_readLE32(ptr noundef %12)
  store i32 %13, ptr %6, align 4, !tbaa !11
  %14 = load i32, ptr %6, align 4, !tbaa !11
  %15 = icmp eq i32 %14, -47205080
  br i1 %15, label %16, label %17

16:                                               ; preds = %11
  store i32 1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %23

17:                                               ; preds = %11
  %18 = load i32, ptr %6, align 4, !tbaa !11
  %19 = and i32 %18, -16
  %20 = icmp eq i32 %19, 407710288
  br i1 %20, label %21, label %22

21:                                               ; preds = %17
  store i32 1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %23

22:                                               ; preds = %17
  store i32 0, ptr %7, align 4
  br label %23

23:                                               ; preds = %22, %21, %16
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  %24 = load i32, ptr %7, align 4
  switch i32 %24, label %28 [
    i32 0, label %25
    i32 1, label %26
  ]

25:                                               ; preds = %23
  store i32 0, ptr %3, align 4
  br label %26

26:                                               ; preds = %25, %23, %10
  %27 = load i32, ptr %3, align 4
  ret i32 %27

28:                                               ; preds = %23
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint 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 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 #3 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"long", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"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: inlinehint nounwind uwtable
declare hidden i32 @MEM_readLE32(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local range(i32 0, 2) i32 @ZSTD_isFrame(ptr noundef %0, i64 noundef %1) local_unnamed_addr #1 {
  %3 = icmp ult i64 %1, 4
  br i1 %3, label %.thread, label %4

4:                                                ; preds = %2
  %5 = tail call i32 @MEM_readLE32(ptr noundef %0)
  %.fr10 = freeze i32 %5
  %6 = icmp eq i32 %.fr10, -47205080
  br i1 %6, label %.thread, label %7

7:                                                ; preds = %4
  %8 = and i32 %.fr10, -16
  %.not = icmp eq i32 %8, 407710288
  %spec.select = zext i1 %.not to i32
  br label %.thread

.thread:                                          ; preds = %7, %4, %2
  %.1 = phi i32 [ 0, %2 ], [ 1, %4 ], [ %spec.select, %7 ]
  ret i32 %.1
}

attributes #0 = { inlinehint 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 #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" }

!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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,SROAPass,SimplifyCFGPass,TailCallElimPass