; LLVM IR from facebookresearch/habitat-sim :: src/deps/basis-universal/encoder/jpgd.ll (ZN4jpgd12jpeg_decoder11next_markerEv)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZN4jpgd12jpeg_decoder8get_bitsEi(ptr noundef nonnull align 8 dereferenceable(13523), i32 noundef) #1 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef i32 @_ZN4jpgd12jpeg_decoder11next_markerEv(ptr noundef nonnull align 8 dereferenceable(13523) %0) #2 align 2 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  %5 = load ptr, ptr %2, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #3
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #3
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %21, %1
  br label %7

7:                                                ; preds = %11, %6
  %8 = load i32, ptr %4, align 4, !tbaa !9
  %9 = add i32 %8, 1
  store i32 %9, ptr %4, align 4, !tbaa !9
  %10 = call noundef i32 @_ZN4jpgd12jpeg_decoder8get_bitsEi(ptr noundef nonnull align 8 dereferenceable(13523) %5, i32 noundef 8)
  store i32 %10, ptr %3, align 4, !tbaa !9
  br label %11

11:                                               ; preds = %7
  %12 = load i32, ptr %3, align 4, !tbaa !9
  %13 = icmp ne i32 %12, 255
  br i1 %13, label %7, label %14, !llvm.loop !11

14:                                               ; preds = %11
  br label %15

15:                                               ; preds = %17, %14
  %16 = call noundef i32 @_ZN4jpgd12jpeg_decoder8get_bitsEi(ptr noundef nonnull align 8 dereferenceable(13523) %5, i32 noundef 8)
  store i32 %16, ptr %3, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %15
  %18 = load i32, ptr %3, align 4, !tbaa !9
  %19 = icmp eq i32 %18, 255
  br i1 %19, label %15, label %20, !llvm.loop !13

20:                                               ; preds = %17
  br label %21

21:                                               ; preds = %20
  %22 = load i32, ptr %3, align 4, !tbaa !9
  %23 = icmp eq i32 %22, 0
  br i1 %23, label %6, label %24, !llvm.loop !14

24:                                               ; preds = %21
  %25 = load i32, ptr %3, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #3
  ret i32 %25
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { inlinehint mustprogress 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 #2 = { mustprogress 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 #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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}
!14 = distinct !{!14, !12}


; 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: inlinehint mustprogress uwtable
declare dso_local noundef i32 @_ZN4jpgd12jpeg_decoder8get_bitsEi(ptr noundef nonnull align 8 dereferenceable(13523), i32 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
define dso_local noundef range(i32 256, 255) i32 @_ZN4jpgd12jpeg_decoder11next_markerEv(ptr noundef nonnull align 8 dereferenceable(13523) %0) local_unnamed_addr #1 align 2 {
  br label %.loopexit

.loopexit:                                        ; preds = %.loopexit.backedge, %1
  %2 = tail call noundef i32 @_ZN4jpgd12jpeg_decoder8get_bitsEi(ptr noundef nonnull align 8 dereferenceable(13523) %0, i32 noundef 8)
  %.not = icmp eq i32 %2, 255
  br i1 %.not, label %.preheader, label %.loopexit.backedge

.loopexit.backedge:                               ; preds = %.preheader, %.loopexit
  br label %.loopexit, !llvm.loop !5

.preheader:                                       ; preds = %.loopexit, %.preheader
  %3 = tail call noundef i32 @_ZN4jpgd12jpeg_decoder8get_bitsEi(ptr noundef nonnull align 8 dereferenceable(13523) %0, i32 noundef 8)
  switch i32 %3, label %4 [
    i32 255, label %.preheader
    i32 0, label %.loopexit.backedge
  ]

4:                                                ; preds = %.preheader
  ret i32 %3
}

attributes #0 = { inlinehint mustprogress 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 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" }

!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 = distinct !{!5, !6}
!6 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: BDCEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass