; LLVM IR from aap/pdp6 :: tools (dtr2dta)

; 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"

@blockbuf = external dso_local global [73984 x i64], align 16

; 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: nounwind uwtable
declare dso_local i64 @readsimh(ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local i32 @readdta(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca i64, align 8
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  store i32 0, ptr %4, align 4, !tbaa !9
  br label %5

5:                                                ; preds = %15, %1
  %6 = load ptr, ptr %2, align 8, !tbaa !5
  %7 = call i64 @readsimh(ptr noundef %6)
  store i64 %7, ptr %3, align 8, !tbaa !11
  %8 = load i64, ptr %3, align 8, !tbaa !11
  %9 = icmp ne i64 %8, -1
  br i1 %9, label %10, label %13

10:                                               ; preds = %5
  %11 = load i32, ptr %4, align 4, !tbaa !9
  %12 = icmp slt i32 %11, 73984
  br label %13

13:                                               ; preds = %10, %5
  %14 = phi i1 [ false, %5 ], [ %12, %10 ]
  br i1 %14, label %15, label %21

15:                                               ; preds = %13
  %16 = load i64, ptr %3, align 8, !tbaa !11
  %17 = load i32, ptr %4, align 4, !tbaa !9
  %18 = add nsw i32 %17, 1
  store i32 %18, ptr %4, align 4, !tbaa !9
  %19 = sext i32 %17 to i64
  %20 = getelementptr inbounds [73984 x i64], ptr @blockbuf, i64 0, i64 %19
  store i64 %16, ptr %20, align 8, !tbaa !11
  br label %5, !llvm.loop !13

21:                                               ; preds = %13
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = icmp ne i32 %22, 73984
  %24 = zext i1 %23 to i32
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #2
  ret i32 %24
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #2 = { 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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"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"

@blockbuf = external dso_local local_unnamed_addr global [73984 x i64], align 16

; Function Attrs: nounwind uwtable
declare dso_local i64 @readsimh(ptr noundef) local_unnamed_addr #0

; Function Attrs: nounwind uwtable
define dso_local range(i32 0, 2) i32 @readdta(ptr noundef %0) local_unnamed_addr #0 {
  %2 = tail call i64 @readsimh(ptr noundef %0)
  %.not = icmp eq i64 %2, -1
  br i1 %.not, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %1 ]
  %3 = phi i64 [ %5, %.lr.ph ], [ %2, %1 ]
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %4 = getelementptr inbounds [73984 x i64], ptr @blockbuf, i64 0, i64 %indvars.iv
  store i64 %3, ptr %4, align 8, !tbaa !5
  %5 = tail call i64 @readsimh(ptr noundef %0)
  %6 = icmp ne i64 %5, -1
  %7 = icmp ult i64 %indvars.iv, 73983
  %8 = and i1 %6, %7
  br i1 %8, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !9

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %9 = icmp ne i64 %indvars.iv.next, 73984
  %10 = zext i1 %9 to i32
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %1
  %.0.lcssa = phi i32 [ 1, %1 ], [ %10, %._crit_edge.loopexit ]
  ret i32 %.0.lcssa
}

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" }

!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 = !{!"long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}


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