; LLVM IR from Nigh/Basic-Compression-Library :: src (bfc)

; 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: nounwind uwtable
define dso_local i32 @ReadWord32(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca [4 x i8], align 1
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  %4 = getelementptr inbounds [4 x i8], ptr %3, i64 0, i64 0
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = call i64 @fread(ptr noundef %4, i64 noundef 4, i64 noundef 1, ptr noundef %5)
  %7 = getelementptr inbounds [4 x i8], ptr %3, i64 0, i64 0
  %8 = load i8, ptr %7, align 1, !tbaa !9
  %9 = zext i8 %8 to i32
  %10 = shl i32 %9, 24
  %11 = getelementptr inbounds [4 x i8], ptr %3, i64 0, 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 %10, %14
  %16 = getelementptr inbounds [4 x i8], ptr %3, i64 0, i64 2
  %17 = load i8, ptr %16, align 1, !tbaa !9
  %18 = zext i8 %17 to i32
  %19 = shl i32 %18, 8
  %20 = add i32 %15, %19
  %21 = getelementptr inbounds [4 x i8], ptr %3, i64 0, i64 3
  %22 = load i8, ptr %21, align 1, !tbaa !9
  %23 = zext i8 %22 to i32
  %24 = add i32 %20, %23
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %24
}

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

declare i64 @fread(ptr noundef, i64 noundef, i64 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}


; 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: nofree nounwind uwtable
define dso_local i32 @ReadWord32(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = alloca [4 x i8], align 1
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #3
  %3 = call i64 @fread(ptr noundef nonnull %2, i64 noundef 4, i64 noundef 1, ptr noundef %0)
  %4 = load i8, ptr %2, align 1, !tbaa !5
  %5 = zext i8 %4 to i32
  %6 = shl nuw i32 %5, 24
  %7 = getelementptr inbounds i8, ptr %2, i64 1
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %9 = zext i8 %8 to i32
  %10 = shl nuw nsw i32 %9, 16
  %11 = or disjoint i32 %10, %6
  %12 = getelementptr inbounds i8, ptr %2, i64 2
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %14 = zext i8 %13 to i32
  %15 = shl nuw nsw i32 %14, 8
  %16 = or disjoint i32 %11, %15
  %17 = getelementptr inbounds i8, ptr %2, i64 3
  %18 = load i8, ptr %17, align 1, !tbaa !5
  %19 = zext i8 %18 to i32
  %20 = or disjoint i32 %16, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #3
  ret i32 %20
}

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

; Function Attrs: nofree nounwind
declare noundef i64 @fread(ptr nocapture noundef, i64 noundef, i64 noundef, ptr nocapture noundef) local_unnamed_addr #2

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

attributes #0 = { nofree 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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { nofree nounwind "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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}


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