; LLVM IR from openxla/xla :: xla/tsl/platform/testdata (test_echo)

; 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"

@stdin = external global ptr, align 8
@stdout = external global ptr, align 8

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %4

4:                                                ; preds = %18, %0
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  %5 = load ptr, ptr @stdin, align 8, !tbaa !5
  %6 = call i32 @fgetc(ptr noundef %5)
  store i32 %6, ptr %2, align 4, !tbaa !9
  %7 = load i32, ptr %2, align 4, !tbaa !9
  %8 = icmp sle i32 %7, 0
  br i1 %8, label %9, label %10

9:                                                ; preds = %4
  store i32 3, ptr %3, align 4
  br label %16

10:                                               ; preds = %4
  %11 = load i32, ptr %2, align 4, !tbaa !9
  %12 = trunc i32 %11 to i8
  %13 = sext i8 %12 to i32
  %14 = load ptr, ptr @stdout, align 8, !tbaa !5
  %15 = call i32 @fputc(i32 noundef %13, ptr noundef %14)
  store i32 0, ptr %3, align 4
  br label %16

16:                                               ; preds = %10, %9
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  %17 = load i32, ptr %3, align 4
  switch i32 %17, label %20 [
    i32 0, label %18
    i32 3, label %19
  ]

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

19:                                               ; preds = %16
  ret i32 0

20:                                               ; preds = %16
  unreachable
}

; 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

declare i32 @fputc(i32 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 = { mustprogress norecurse 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"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"

@stdin = external local_unnamed_addr global ptr, align 8
@stdout = external local_unnamed_addr global ptr, align 8

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = load ptr, ptr @stdin, align 8, !tbaa !5
  %2 = tail call i32 @fgetc(ptr noundef %1)
  %3 = icmp slt i32 %2, 1
  br i1 %3, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  %4 = phi i32 [ %9, %.lr.ph ], [ %2, %0 ]
  %sext = shl i32 %4, 24
  %5 = ashr exact i32 %sext, 24
  %6 = load ptr, ptr @stdout, align 8, !tbaa !5
  %7 = tail call i32 @fputc(i32 noundef %5, ptr noundef %6)
  %8 = load ptr, ptr @stdin, align 8, !tbaa !5
  %9 = tail call i32 @fgetc(ptr noundef %8)
  %10 = icmp slt i32 %9, 1
  br i1 %10, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %.lr.ph, %0
  ret i32 0
}

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

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

attributes #0 = { mustprogress nofree norecurse 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 = !{!6, !6, i64 0}
!6 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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