; LLVM IR from petecoup/argon :: src/codec (ppm_codec)

; 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
declare dso_local zeroext i1 @is_eof(ptr noundef) #0

; Function Attrs: nounwind uwtable
declare dso_local signext i8 @ar_peek(ptr noundef) #0

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

declare i32 @fgetc(ptr noundef) #2

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

; Function Attrs: nounwind uwtable
define dso_local void @scan_to_eol(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i8, align 1
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #3
  br label %4

4:                                                ; preds = %20, %1
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = call zeroext i1 @is_eof(ptr noundef %5)
  br i1 %6, label %18, label %7

7:                                                ; preds = %4
  %8 = load ptr, ptr %2, align 8, !tbaa !5
  %9 = call signext i8 @ar_peek(ptr noundef %8)
  store i8 %9, ptr %3, align 1, !tbaa !9
  %10 = sext i8 %9 to i32
  %11 = icmp ne i32 %10, -1
  br i1 %11, label %12, label %16

12:                                               ; preds = %7
  %13 = load i8, ptr %3, align 1, !tbaa !9
  %14 = sext i8 %13 to i32
  %15 = icmp ne i32 %14, 10
  br label %16

16:                                               ; preds = %12, %7
  %17 = phi i1 [ false, %7 ], [ %15, %12 ]
  br label %18

18:                                               ; preds = %16, %4
  %19 = phi i1 [ false, %4 ], [ %17, %16 ]
  br i1 %19, label %20, label %24

20:                                               ; preds = %18
  %21 = load ptr, ptr %2, align 8, !tbaa !5
  %22 = call i32 @fgetc(ptr noundef %21)
  %23 = trunc i32 %22 to i8
  store i8 %23, ptr %3, align 1, !tbaa !9
  br label %4, !llvm.loop !10

24:                                               ; preds = %18
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #3
  ret void
}

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}
!10 = distinct !{!10, !11}
!11 = !{!"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"

; Function Attrs: nounwind uwtable
declare dso_local zeroext i1 @is_eof(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
declare dso_local signext i8 @ar_peek(ptr noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind
declare noundef i32 @fgetc(ptr nocapture noundef) local_unnamed_addr #1

; Function Attrs: nounwind uwtable
define dso_local void @scan_to_eol(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call zeroext i1 @is_eof(ptr noundef %0)
  br i1 %2, label %.critedge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %4
  %3 = tail call signext i8 @ar_peek(ptr noundef %0)
  switch i8 %3, label %4 [
    i8 -1, label %.critedge
    i8 10, label %.critedge
  ]

4:                                                ; preds = %.lr.ph
  %5 = tail call i32 @fgetc(ptr noundef %0)
  %6 = tail call zeroext i1 @is_eof(ptr noundef %0)
  br i1 %6, label %.critedge, label %.lr.ph, !llvm.loop !5

.critedge:                                        ; preds = %4, %.lr.ph, %.lr.ph, %1
  ret void
}

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 = { 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" }

!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: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,SROAPass,SimplifyCFGPass,TailCallElimPass