; LLVM IR from mncoppola/rpef :: utilities_src/squashfs4.1/squashfs-tools (compressor)

; 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.compressor = type { ptr, ptr, i32, ptr, i32 }

@compressor = external dso_local global [4 x %struct.compressor], align 16

; Function Attrs: nounwind uwtable
define dso_local ptr @lookup_compressor(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  store i32 0, ptr %3, align 4, !tbaa !9
  br label %4

4:                                                ; preds = %22, %1
  %5 = load i32, ptr %3, align 4, !tbaa !9
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [4 x %struct.compressor], ptr @compressor, i64 0, i64 %6
  %8 = getelementptr inbounds %struct.compressor, ptr %7, i32 0, i32 2
  %9 = load i32, ptr %8, align 8, !tbaa !11
  %10 = icmp ne i32 %9, 0
  br i1 %10, label %11, label %25

11:                                               ; preds = %4
  %12 = load i32, ptr %3, align 4, !tbaa !9
  %13 = sext i32 %12 to i64
  %14 = getelementptr inbounds [4 x %struct.compressor], ptr @compressor, i64 0, i64 %13
  %15 = getelementptr inbounds %struct.compressor, ptr %14, i32 0, i32 3
  %16 = load ptr, ptr %15, align 8, !tbaa !13
  %17 = load ptr, ptr %2, align 8, !tbaa !5
  %18 = call i32 @strcmp(ptr noundef %16, ptr noundef %17) #4
  %19 = icmp eq i32 %18, 0
  br i1 %19, label %20, label %21

20:                                               ; preds = %11
  br label %25

21:                                               ; preds = %11
  br label %22

22:                                               ; preds = %21
  %23 = load i32, ptr %3, align 4, !tbaa !9
  %24 = add nsw i32 %23, 1
  store i32 %24, ptr %3, align 4, !tbaa !9
  br label %4, !llvm.loop !14

25:                                               ; preds = %20, %4
  %26 = load i32, ptr %3, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds [4 x %struct.compressor], ptr @compressor, i64 0, i64 %27
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret ptr %28
}

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

; Function Attrs: nounwind willreturn memory(read)
declare i32 @strcmp(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 = { 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 #3 = { nounwind }
attributes #4 = { 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/C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !10, i64 16}
!12 = !{!"compressor", !6, i64 0, !6, i64 8, !10, i64 16, !6, i64 24, !10, i64 32}
!13 = !{!12, !6, i64 24}
!14 = distinct !{!14, !15}
!15 = !{!"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"

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

@compressor = external dso_local global [4 x %struct.compressor], align 16

; Function Attrs: nofree nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local nonnull ptr @lookup_compressor(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i32, ptr getelementptr inbounds (i8, ptr @compressor, i64 16), align 16, !tbaa !5
  %.not4 = icmp eq i32 %2, 0
  br i1 %.not4, label %._crit_edge, label %.lr.ph

3:                                                ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %4 = getelementptr inbounds [4 x %struct.compressor], ptr @compressor, i64 0, i64 %indvars.iv.next
  %5 = getelementptr inbounds i8, ptr %4, i64 16
  %6 = load i32, ptr %5, align 8, !tbaa !5
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

.lr.ph:                                           ; preds = %1, %3
  %indvars.iv = phi i64 [ %indvars.iv.next, %3 ], [ 0, %1 ]
  %7 = phi ptr [ %4, %3 ], [ @compressor, %1 ]
  %8 = getelementptr inbounds i8, ptr %7, i64 24
  %9 = load ptr, ptr %8, align 8, !tbaa !13
  %10 = tail call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %9, ptr noundef nonnull dereferenceable(1) %0) #2
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %._crit_edge, label %3

._crit_edge:                                      ; preds = %3, %.lr.ph, %1
  %.lcssa = phi ptr [ @compressor, %1 ], [ %7, %.lr.ph ], [ %4, %3 ]
  ret ptr %.lcssa
}

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

attributes #0 = { nofree nounwind memory(read, inaccessiblemem: none) 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 memory(argmem: 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 #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, !10, i64 16}
!6 = !{!"compressor", !7, i64 0, !7, i64 8, !10, i64 16, !7, i64 24, !10, i64 32}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!"int", !8, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = !{!6, !7, i64 24}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,IndVarSimplifyPass,InferAlignmentPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass