; LLVM IR from niessner/Matterport :: code/gaps/pkgs/png (pngrutil)

; 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"

@.str = external hidden unnamed_addr constant [34 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @png_get_uint_31(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %6 = load ptr, ptr %4, align 8, !tbaa !5
  %7 = load i8, ptr %6, align 1, !tbaa !9
  %8 = zext i8 %7 to i32
  %9 = shl i32 %8, 24
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds i8, ptr %10, i64 1
  %12 = load i8, ptr %11, align 1, !tbaa !9
  %13 = zext i8 %12 to i32
  %14 = shl i32 %13, 16
  %15 = add i32 %9, %14
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = getelementptr inbounds i8, ptr %16, i64 2
  %18 = load i8, ptr %17, align 1, !tbaa !9
  %19 = zext i8 %18 to i32
  %20 = shl i32 %19, 8
  %21 = add i32 %15, %20
  %22 = load ptr, ptr %4, align 8, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %22, i64 3
  %24 = load i8, ptr %23, align 1, !tbaa !9
  %25 = zext i8 %24 to i32
  %26 = add i32 %21, %25
  store i32 %26, ptr %5, align 4, !tbaa !10
  %27 = load i32, ptr %5, align 4, !tbaa !10
  %28 = icmp ugt i32 %27, 2147483647
  br i1 %28, label %29, label %31

29:                                               ; preds = %2
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  call void @png_error(ptr noundef %30, ptr noundef @.str)
  br label %31

31:                                               ; preds = %29, %2
  %32 = load i32, ptr %5, align 4, !tbaa !10
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %32
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare void @png_error(ptr noundef, ptr noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1

attributes #0 = { 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 = !{!7, !7, i64 0}
!10 = !{!11, !11, i64 0}
!11 = !{!"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"

@.str = external hidden unnamed_addr constant [34 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @png_get_uint_31(ptr noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = load i8, ptr %1, align 1, !tbaa !5
  %4 = zext i8 %3 to i32
  %5 = shl nuw i32 %4, 24
  %6 = getelementptr inbounds i8, ptr %1, i64 1
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %1, i64 2
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %1, i64 3
  %11 = load i8, ptr %10, align 1, !tbaa !5
  %12 = icmp slt i32 %5, 0
  br i1 %12, label %13, label %14

13:                                               ; preds = %2
  tail call void @png_error(ptr noundef %0, ptr noundef nonnull @.str) #2
  br label %14

14:                                               ; preds = %13, %2
  %15 = zext i8 %7 to i32
  %16 = shl nuw nsw i32 %15, 16
  %17 = zext i8 %9 to i32
  %18 = shl nuw nsw i32 %17, 8
  %19 = zext i8 %11 to i32
  %20 = or disjoint i32 %16, %19
  %21 = or disjoint i32 %20, %18
  %22 = or disjoint i32 %21, %5
  ret i32 %22
}

declare void @png_error(ptr noundef, ptr noundef) local_unnamed_addr #1

attributes #0 = { 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 = { "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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


; Effective O3 passes: GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,TailCallElimPass