; LLVM IR from sysprog21/shecc :: src (ssa)

; 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"

%struct.block_list_t = type { ptr, ptr }
%struct.block = type { [1600 x %struct.var], i32, ptr, ptr, ptr, i32, ptr }
%struct.var = type { [32 x i8], [32 x i8], i32, i8, i8, i32, i32, i32, i32, i32, ptr, i32, [64 x ptr], i32, %struct.rename_t, %struct.ref_block_list, ptr, ptr, ptr, i32, i8, i8, i8 }
%struct.rename_t = type { i32, [64 x i32], i32 }
%struct.ref_block_list = type { ptr, ptr }

@BLOCKS = external dso_local global %struct.block_list_t, align 8

; 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 willreturn memory(read)
declare i32 @strcmp(ptr noundef, ptr noundef) #1

; Function Attrs: nounwind uwtable
define dso_local ptr @find_global_var(ptr noundef %0) #2 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  %7 = load ptr, ptr @BLOCKS, align 8, !tbaa !9
  store ptr %7, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !11
  br label %8

8:                                                ; preds = %33, %1
  %9 = load i32, ptr %5, align 4, !tbaa !11
  %10 = load ptr, ptr %4, align 8, !tbaa !5
  %11 = getelementptr inbounds %struct.block, ptr %10, i32 0, i32 1
  %12 = load i32, ptr %11, align 8, !tbaa !13
  %13 = icmp slt i32 %9, %12
  br i1 %13, label %15, label %14

14:                                               ; preds = %8
  store i32 2, ptr %6, align 4
  br label %36

15:                                               ; preds = %8
  %16 = load ptr, ptr %4, align 8, !tbaa !5
  %17 = getelementptr inbounds %struct.block, ptr %16, i32 0, i32 0
  %18 = load i32, ptr %5, align 4, !tbaa !11
  %19 = sext i32 %18 to i64
  %20 = getelementptr inbounds [1600 x %struct.var], ptr %17, i64 0, i64 %19
  %21 = getelementptr inbounds %struct.var, ptr %20, i32 0, i32 1
  %22 = getelementptr inbounds [32 x i8], ptr %21, i64 0, i64 0
  %23 = load ptr, ptr %3, align 8, !tbaa !5
  %24 = call i32 @strcmp(ptr noundef %22, ptr noundef %23) #4
  %25 = icmp ne i32 %24, 0
  br i1 %25, label %32, label %26

26:                                               ; preds = %15
  %27 = load ptr, ptr %4, align 8, !tbaa !5
  %28 = getelementptr inbounds %struct.block, ptr %27, i32 0, i32 0
  %29 = load i32, ptr %5, align 4, !tbaa !11
  %30 = sext i32 %29 to i64
  %31 = getelementptr inbounds [1600 x %struct.var], ptr %28, i64 0, i64 %30
  store ptr %31, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %36

32:                                               ; preds = %15
  br label %33

33:                                               ; preds = %32
  %34 = load i32, ptr %5, align 4, !tbaa !11
  %35 = add nsw i32 %34, 1
  store i32 %35, ptr %5, align 4, !tbaa !11
  br label %8, !llvm.loop !15

36:                                               ; preds = %26, %14
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  %37 = load i32, ptr %6, align 4
  switch i32 %37, label %39 [
    i32 2, label %38
  ]

38:                                               ; preds = %36
  store ptr null, ptr %2, align 8
  store i32 1, ptr %6, align 4
  br label %39

39:                                               ; preds = %38, %36
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %40 = load ptr, ptr %2, align 8
  ret ptr %40
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { nounwind willreturn memory(read) "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 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 }
attributes #4 = { nounwind willreturn memory(read) }

!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, !6, i64 0}
!10 = !{!"", !6, i64 0, !6, i64 8}
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !7, i64 0}
!13 = !{!14, !12, i64 1510400}
!14 = !{!"block", !7, i64 0, !12, i64 1510400, !6, i64 1510408, !6, i64 1510416, !6, i64 1510424, !12, i64 1510432, !6, i64 1510440}
!15 = distinct !{!15, !16}
!16 = !{!"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"

%struct.block_list_t = type { ptr, ptr }
%struct.var = type { [32 x i8], [32 x i8], i32, i8, i8, i32, i32, i32, i32, i32, ptr, i32, [64 x ptr], i32, %struct.rename_t, %struct.ref_block_list, ptr, ptr, ptr, i32, i8, i8, i8 }
%struct.rename_t = type { i32, [64 x i32], i32 }
%struct.ref_block_list = type { ptr, ptr }

@BLOCKS = external dso_local local_unnamed_addr global %struct.block_list_t, align 8

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i32 @strcmp(ptr nocapture noundef, ptr nocapture noundef) local_unnamed_addr #0

; Function Attrs: nofree nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local ptr @find_global_var(ptr nocapture noundef readonly %0) local_unnamed_addr #1 {
  %2 = load ptr, ptr @BLOCKS, align 8, !tbaa !5
  %3 = getelementptr inbounds i8, ptr %2, i64 1510400
  %4 = load i32, ptr %3, align 8, !tbaa !10
  %.not1112 = icmp sgt i32 %4, 0
  br i1 %.not1112, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %1
  %wide.trip.count = zext nneg i32 %4 to i64
  br label %.lr.ph

5:                                                ; preds = %.lr.ph
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !13

.lr.ph:                                           ; preds = %.lr.ph.preheader, %5
  %indvars.iv = phi i64 [ 0, %.lr.ph.preheader ], [ %indvars.iv.next, %5 ]
  %6 = getelementptr inbounds [1600 x %struct.var], ptr %2, i64 0, i64 %indvars.iv
  %7 = getelementptr inbounds i8, ptr %6, i64 32
  %8 = tail call i32 @strcmp(ptr noundef nonnull dereferenceable(1) %7, ptr noundef nonnull dereferenceable(1) %0) #2
  %.not = icmp eq i32 %8, 0
  br i1 %.not, label %._crit_edge, label %5

._crit_edge:                                      ; preds = %5, %.lr.ph, %1
  %spec.select = phi ptr [ null, %1 ], [ %6, %.lr.ph ], [ null, %5 ]
  ret ptr %spec.select
}

attributes #0 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 memory(read, inaccessiblemem: none) 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 willreturn memory(read) }

!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, !7, i64 0}
!6 = !{!"", !7, i64 0, !7, i64 8}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C/C++ TBAA"}
!10 = !{!11, !12, i64 1510400}
!11 = !{!"block", !8, i64 0, !12, i64 1510400, !7, i64 1510408, !7, i64 1510416, !7, i64 1510424, !12, i64 1510432, !7, i64 1510440}
!12 = !{!"int", !8, i64 0}
!13 = distinct !{!13, !14}
!14 = !{!"llvm.loop.mustprogress"}


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