; LLVM IR from cornell-zhang/rosetta :: optical-flow/imageLib/ImageIO.ll (Z12skip_commentP8_IO_FILE)

; 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: mustprogress uwtable
define dso_local void @_Z12skip_commentP8_IO_FILE(ptr noundef %0) #1 {
  %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 = %16, %1
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = call i32 @getc(ptr noundef %5)
  %7 = trunc i32 %6 to i8
  store i8 %7, ptr %3, align 1, !tbaa !9
  %8 = sext i8 %7 to i32
  %9 = icmp eq i32 %8, 35
  br i1 %9, label %10, label %17

10:                                               ; preds = %4
  br label %11

11:                                               ; preds = %15, %10
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = call i32 @getc(ptr noundef %12)
  %14 = icmp ne i32 %13, 10
  br i1 %14, label %15, label %16

15:                                               ; preds = %11
  br label %11, !llvm.loop !10

16:                                               ; preds = %11
  br label %4, !llvm.loop !12

17:                                               ; preds = %4
  %18 = load i8, ptr %3, align 1, !tbaa !9
  %19 = sext i8 %18 to i32
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = call i32 @ungetc(i32 noundef %19, ptr noundef %20)
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #3
  ret void
}

declare i32 @getc(ptr noundef) #2

declare i32 @ungetc(i32 noundef, ptr noundef) #2

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


; 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: mustprogress nofree nounwind uwtable
define dso_local void @_Z12skip_commentP8_IO_FILE(ptr nocapture noundef %0) local_unnamed_addr #0 {
  %2 = tail call i32 @getc(ptr noundef %0)
  %sext3 = shl i32 %2, 24
  %3 = icmp eq i32 %sext3, 587202560
  br i1 %3, label %.preheader, label %._crit_edge

.preheader:                                       ; preds = %1, %.preheader.backedge
  %4 = tail call i32 @getc(ptr noundef %0)
  %.not = icmp eq i32 %4, 10
  br i1 %.not, label %5, label %.preheader.backedge

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

5:                                                ; preds = %.preheader
  %6 = tail call i32 @getc(ptr noundef %0)
  %sext = shl i32 %6, 24
  %7 = icmp eq i32 %sext, 587202560
  br i1 %7, label %.preheader.backedge, label %._crit_edge

._crit_edge:                                      ; preds = %5, %1
  %sext.lcssa = phi i32 [ %sext3, %1 ], [ %sext, %5 ]
  %8 = ashr exact i32 %sext.lcssa, 24
  %9 = tail call i32 @ungetc(i32 noundef %8, ptr noundef %0)
  ret void
}

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

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

attributes #0 = { mustprogress nofree 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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass