; LLVM IR from fhanau/Efficient-Compression-Tool :: src/optipng (codec)

; 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"

@_ZL13opng_sig_acTL = external hidden constant [4 x i8], align 1
@_ZL13opng_sig_fcTL = external hidden constant [4 x i8], align 1
@_ZL13opng_sig_fdAT = external hidden constant [4 x i8], align 1

; Function Attrs: nounwind willreturn memory(read)
declare i32 @memcmp(ptr noundef, ptr noundef, i64 noundef) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local i32 @opng_is_apng_chunk(ptr noundef %0) #1 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  %4 = load ptr, ptr %3, align 8, !tbaa !5
  %5 = call i32 @memcmp(ptr noundef %4, ptr noundef @_ZL13opng_sig_acTL, i64 noundef 4) #2
  %6 = icmp eq i32 %5, 0
  br i1 %6, label %15, label %7

7:                                                ; preds = %1
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = call i32 @memcmp(ptr noundef %8, ptr noundef @_ZL13opng_sig_fcTL, i64 noundef 4) #2
  %10 = icmp eq i32 %9, 0
  br i1 %10, label %15, label %11

11:                                               ; preds = %7
  %12 = load ptr, ptr %3, align 8, !tbaa !5
  %13 = call i32 @memcmp(ptr noundef %12, ptr noundef @_ZL13opng_sig_fdAT, i64 noundef 4) #2
  %14 = icmp eq i32 %13, 0
  br i1 %14, label %15, label %16

15:                                               ; preds = %11, %7, %1
  store i32 1, ptr %2, align 4
  br label %17

16:                                               ; preds = %11
  store i32 0, ptr %2, align 4
  br label %17

17:                                               ; preds = %16, %15
  %18 = load i32, ptr %2, align 4
  ret i32 %18
}

attributes #0 = { nounwind willreturn memory(read) "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 = { 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 willreturn memory(read) }

!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"}


; 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"

@_ZL13opng_sig_acTL = external hidden constant [4 x i8], align 1
@_ZL13opng_sig_fcTL = external hidden constant [4 x i8], align 1
@_ZL13opng_sig_fdAT = external hidden constant [4 x i8], align 1

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read) uwtable
define dso_local range(i32 0, 2) i32 @opng_is_apng_chunk(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %bcmp = tail call i32 @bcmp(ptr noundef nonnull dereferenceable(4) %0, ptr noundef nonnull dereferenceable(4) @_ZL13opng_sig_acTL, i64 4)
  %2 = icmp eq i32 %bcmp, 0
  br i1 %2, label %7, label %3

3:                                                ; preds = %1
  %bcmp3 = tail call i32 @bcmp(ptr noundef nonnull dereferenceable(4) %0, ptr noundef nonnull dereferenceable(4) @_ZL13opng_sig_fcTL, i64 4)
  %4 = icmp eq i32 %bcmp3, 0
  br i1 %4, label %7, label %5

5:                                                ; preds = %3
  %bcmp4 = tail call i32 @bcmp(ptr noundef nonnull dereferenceable(4) %0, ptr noundef nonnull dereferenceable(4) @_ZL13opng_sig_fdAT, i64 4)
  %6 = icmp eq i32 %bcmp4, 0
  %spec.select = zext i1 %6 to i32
  br label %7

7:                                                ; preds = %5, %1, %3
  %.0 = phi i32 [ 1, %3 ], [ 1, %1 ], [ %spec.select, %5 ]
  ret i32 %.0
}

; Function Attrs: nofree nounwind willreturn memory(argmem: read)
declare i32 @bcmp(ptr nocapture, ptr nocapture, i64) local_unnamed_addr #1

attributes #0 = { mustprogress nofree 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" }
attributes #1 = { nofree nounwind willreturn memory(argmem: read) }

!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: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass