; LLVM IR from evanxg852000/rockstartdev :: modern-cpp (lc3)

; 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"

@memory = external dso_local global [65535 x i16], align 16

; Function Attrs: nounwind uwtable
declare dso_local zeroext i16 @swap16(i16 noundef zeroext) #0

; Function Attrs: nounwind uwtable
define dso_local void @read_image_file(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i16, align 2
  %4 = alloca i16, align 2
  %5 = alloca ptr, align 8
  %6 = alloca i64, align 8
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 2, ptr %3) #3
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = call i64 @fread(ptr noundef %3, i64 noundef 2, i64 noundef 1, ptr noundef %7)
  %9 = load i16, ptr %3, align 2, !tbaa !9
  %10 = call zeroext i16 @swap16(i16 noundef zeroext %9)
  store i16 %10, ptr %3, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 2, ptr %4) #3
  %11 = load i16, ptr %3, align 2, !tbaa !9
  %12 = zext i16 %11 to i32
  %13 = sub nsw i32 65535, %12
  %14 = trunc i32 %13 to i16
  store i16 %14, ptr %4, align 2, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  %15 = load i16, ptr %3, align 2, !tbaa !9
  %16 = zext i16 %15 to i32
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i16, ptr @memory, i64 %17
  store ptr %18, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  %19 = load ptr, ptr %5, align 8, !tbaa !5
  %20 = load i16, ptr %4, align 2, !tbaa !9
  %21 = zext i16 %20 to i64
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = call i64 @fread(ptr noundef %19, i64 noundef 2, i64 noundef %21, ptr noundef %22)
  store i64 %23, ptr %6, align 8, !tbaa !11
  br label %24

24:                                               ; preds = %28, %1
  %25 = load i64, ptr %6, align 8, !tbaa !11
  %26 = add i64 %25, -1
  store i64 %26, ptr %6, align 8, !tbaa !11
  %27 = icmp ugt i64 %25, 0
  br i1 %27, label %28, label %35

28:                                               ; preds = %24
  %29 = load ptr, ptr %5, align 8, !tbaa !5
  %30 = load i16, ptr %29, align 2, !tbaa !9
  %31 = call zeroext i16 @swap16(i16 noundef zeroext %30)
  %32 = load ptr, ptr %5, align 8, !tbaa !5
  store i16 %31, ptr %32, align 2, !tbaa !9
  %33 = load ptr, ptr %5, align 8, !tbaa !5
  %34 = getelementptr inbounds i16, ptr %33, i32 1
  store ptr %34, ptr %5, align 8, !tbaa !5
  br label %24, !llvm.loop !13

35:                                               ; preds = %24
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 2, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 2, ptr %3) #3
  ret void
}

; 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 = !{!10, !10, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


; 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"

@memory = external dso_local global [65535 x i16], align 16

; Function Attrs: nounwind uwtable
declare dso_local zeroext i16 @swap16(i16 noundef zeroext) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local void @read_image_file(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = alloca i16, align 2
  call void @llvm.lifetime.start.p0(i64 2, ptr nonnull %2) #3
  %3 = call i64 @fread(ptr noundef nonnull %2, i64 noundef 2, i64 noundef 1, ptr noundef %0)
  %4 = load i16, ptr %2, align 2, !tbaa !5
  %5 = tail call zeroext i16 @swap16(i16 noundef zeroext %4)
  %6 = xor i16 %5, -1
  %7 = zext i16 %5 to i64
  %8 = getelementptr inbounds i16, ptr @memory, i64 %7
  %9 = zext i16 %6 to i64
  %10 = tail call i64 @fread(ptr noundef nonnull %8, i64 noundef 2, i64 noundef %9, ptr noundef %0)
  %.not8 = icmp eq i64 %10, 0
  br i1 %.not8, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %.010 = phi i64 [ %11, %.lr.ph ], [ %10, %1 ]
  %.079 = phi ptr [ %14, %.lr.ph ], [ %8, %1 ]
  %11 = add i64 %.010, -1
  %12 = load i16, ptr %.079, align 2, !tbaa !5
  %13 = tail call zeroext i16 @swap16(i16 noundef zeroext %12)
  store i16 %13, ptr %.079, align 2, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %.079, i64 2
  %.not = icmp eq i64 %11, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !9

._crit_edge:                                      ; preds = %.lr.ph, %1
  call void @llvm.lifetime.end.p0(i64 2, ptr nonnull %2) #3
  ret void
}

; 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 = { 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 = !{!"short", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: DSEPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass