; LLVM IR from sysprog21/shecc :: src (ssa)

; 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"

%struct.arena_block = type { ptr, i32, i32, ptr }

@.str = external hidden unnamed_addr constant [43 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local ptr @arena_block_create(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  store i32 %0, ptr %2, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #7
  %4 = call noalias ptr @malloc(i64 noundef 24) #8
  store ptr %4, ptr %3, align 8, !tbaa !9
  %5 = load ptr, ptr %3, align 8, !tbaa !9
  %6 = icmp ne ptr %5, null
  br i1 %6, label %9, label %7

7:                                                ; preds = %1
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  call void @exit(i32 noundef 1) #9
  unreachable

9:                                                ; preds = %1
  %10 = load i32, ptr %2, align 4, !tbaa !5
  %11 = sext i32 %10 to i64
  %12 = call noalias ptr @calloc(i64 noundef %11, i64 noundef 1) #10
  %13 = load ptr, ptr %3, align 8, !tbaa !9
  %14 = getelementptr inbounds %struct.arena_block, ptr %13, i32 0, i32 0
  store ptr %12, ptr %14, align 8, !tbaa !11
  %15 = load ptr, ptr %3, align 8, !tbaa !9
  %16 = getelementptr inbounds %struct.arena_block, ptr %15, i32 0, i32 0
  %17 = load ptr, ptr %16, align 8, !tbaa !11
  %18 = icmp ne ptr %17, null
  br i1 %18, label %22, label %19

19:                                               ; preds = %9
  %20 = call i32 (ptr, ...) @printf(ptr noundef @.str)
  %21 = load ptr, ptr %3, align 8, !tbaa !9
  call void @free(ptr noundef %21) #7
  call void @exit(i32 noundef 1) #9
  unreachable

22:                                               ; preds = %9
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = load ptr, ptr %3, align 8, !tbaa !9
  %25 = getelementptr inbounds %struct.arena_block, ptr %24, i32 0, i32 1
  store i32 %23, ptr %25, align 8, !tbaa !13
  %26 = load ptr, ptr %3, align 8, !tbaa !9
  %27 = getelementptr inbounds %struct.arena_block, ptr %26, i32 0, i32 2
  store i32 0, ptr %27, align 4, !tbaa !14
  %28 = load ptr, ptr %3, align 8, !tbaa !9
  %29 = getelementptr inbounds %struct.arena_block, ptr %28, i32 0, i32 3
  store ptr null, ptr %29, align 8, !tbaa !15
  %30 = load ptr, ptr %3, align 8, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #7
  ret ptr %30
}

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

; Function Attrs: nounwind allocsize(0)
declare noalias ptr @malloc(i64 noundef) #2

declare i32 @printf(ptr noundef, ...) #3

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) #4

; Function Attrs: nounwind allocsize(0,1)
declare noalias ptr @calloc(i64 noundef, i64 noundef) #5

; Function Attrs: nounwind
declare void @free(ptr noundef) #6

; 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 = { nounwind allocsize(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 = { "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 #4 = { noreturn 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 #5 = { nounwind allocsize(0,1) "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 #6 = { 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 #7 = { nounwind }
attributes #8 = { nounwind allocsize(0) }
attributes #9 = { noreturn nounwind }
attributes #10 = { nounwind allocsize(0,1) }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !10, i64 0}
!12 = !{!"arena_block", !10, i64 0, !6, i64 8, !6, i64 12, !10, i64 16}
!13 = !{!12, !6, i64 8}
!14 = !{!12, !6, i64 12}
!15 = !{!12, !10, i64 16}


; 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 [43 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local noalias noundef ptr @arena_block_create(i32 noundef %0) local_unnamed_addr #0 {
  %2 = tail call noalias dereferenceable_or_null(24) ptr @malloc(i64 noundef 24) #6
  %.not = icmp eq ptr %2, null
  br i1 %.not, label %3, label %5

3:                                                ; preds = %1
  %4 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  tail call void @exit(i32 noundef 1) #7
  unreachable

5:                                                ; preds = %1
  %6 = sext i32 %0 to i64
  %7 = tail call noalias ptr @calloc(i64 noundef %6, i64 noundef 1) #8
  store ptr %7, ptr %2, align 8, !tbaa !5
  %.not9 = icmp eq ptr %7, null
  br i1 %.not9, label %8, label %10

8:                                                ; preds = %5
  %9 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str)
  tail call void @free(ptr noundef nonnull %2) #9
  tail call void @exit(i32 noundef 1) #7
  unreachable

10:                                               ; preds = %5
  %11 = getelementptr inbounds i8, ptr %2, i64 8
  store i32 %0, ptr %11, align 8, !tbaa !11
  %12 = getelementptr inbounds i8, ptr %2, i64 12
  store i32 0, ptr %12, align 4, !tbaa !12
  %13 = getelementptr inbounds i8, ptr %2, i64 16
  store ptr null, ptr %13, align 8, !tbaa !13
  ret ptr %2
}

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @malloc(i64 noundef) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: noreturn nounwind
declare void @exit(i32 noundef) local_unnamed_addr #3

; Function Attrs: mustprogress nofree nounwind willreturn allockind("alloc,zeroed") allocsize(0,1) memory(inaccessiblemem: readwrite)
declare noalias noundef ptr @calloc(i64 noundef, i64 noundef) local_unnamed_addr #4

; Function Attrs: mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite)
declare void @free(ptr allocptr nocapture noundef) local_unnamed_addr #5

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 nofree nounwind willreturn allockind("alloc,uninitialized") allocsize(0) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 = { 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 = { noreturn 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 #4 = { mustprogress nofree nounwind willreturn allockind("alloc,zeroed") allocsize(0,1) memory(inaccessiblemem: readwrite) "alloc-family"="malloc" "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 #5 = { mustprogress nounwind willreturn allockind("free") memory(argmem: readwrite, inaccessiblemem: readwrite) "alloc-family"="malloc" "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 #6 = { nounwind allocsize(0) }
attributes #7 = { noreturn nounwind }
attributes #8 = { nounwind allocsize(0,1) }
attributes #9 = { 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, !7, i64 0}
!6 = !{!"arena_block", !7, i64 0, !10, i64 8, !10, i64 12, !7, i64 16}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = !{!6, !10, i64 8}
!12 = !{!6, !10, i64 12}
!13 = !{!6, !7, i64 16}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass