; LLVM IR from 0intro/wmii :: lib/libutf (runestrchr)

; 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
define dso_local ptr @runestrchr(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %9 = load i32, ptr %5, align 4, !tbaa !9
  store i32 %9, ptr %6, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = icmp eq i32 %10, 0
  br i1 %11, label %12, label %22

12:                                               ; preds = %2
  br label %13

13:                                               ; preds = %18, %12
  %14 = load ptr, ptr %4, align 8, !tbaa !5
  %15 = getelementptr inbounds i32, ptr %14, i32 1
  store ptr %15, ptr %4, align 8, !tbaa !5
  %16 = load i32, ptr %14, align 4, !tbaa !9
  %17 = icmp ne i32 %16, 0
  br i1 %17, label %18, label %19

18:                                               ; preds = %13
  br label %13, !llvm.loop !11

19:                                               ; preds = %13
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds i32, ptr %20, i64 -1
  store ptr %21, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %37

22:                                               ; preds = %2
  br label %23

23:                                               ; preds = %35, %22
  %24 = load ptr, ptr %4, align 8, !tbaa !5
  %25 = getelementptr inbounds i32, ptr %24, i32 1
  store ptr %25, ptr %4, align 8, !tbaa !5
  %26 = load i32, ptr %24, align 4, !tbaa !9
  store i32 %26, ptr %7, align 4, !tbaa !9
  %27 = icmp ne i32 %26, 0
  br i1 %27, label %28, label %36

28:                                               ; preds = %23
  %29 = load i32, ptr %7, align 4, !tbaa !9
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = icmp eq i32 %29, %30
  br i1 %31, label %32, label %35

32:                                               ; preds = %28
  %33 = load ptr, ptr %4, align 8, !tbaa !5
  %34 = getelementptr inbounds i32, ptr %33, i64 -1
  store ptr %34, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %37

35:                                               ; preds = %28
  br label %23, !llvm.loop !13

36:                                               ; preds = %23
  store ptr null, ptr %3, align 8
  store i32 1, ptr %8, align 4
  br label %37

37:                                               ; preds = %36, %32, %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  %38 = load ptr, ptr %3, align 8
  ret ptr %38
}

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

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

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 = { 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 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; 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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @runestrchr(ptr noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp eq i32 %1, 0
  br i1 %3, label %.preheader, label %.preheader11

.preheader:                                       ; preds = %2, %.preheader
  %.08 = phi ptr [ %4, %.preheader ], [ %0, %2 ]
  %4 = getelementptr inbounds i8, ptr %.08, i64 4
  %5 = load i32, ptr %.08, align 4, !tbaa !5
  %.not10 = icmp eq i32 %5, 0
  br i1 %.not10, label %.loopexit, label %.preheader, !llvm.loop !9

.preheader11:                                     ; preds = %2, %7
  %.1 = phi ptr [ %8, %7 ], [ %0, %2 ]
  %6 = load i32, ptr %.1, align 4, !tbaa !5
  %.not = icmp eq i32 %6, 0
  br i1 %.not, label %.loopexit, label %7

7:                                                ; preds = %.preheader11
  %8 = getelementptr inbounds i8, ptr %.1, i64 4
  %9 = icmp eq i32 %6, %1
  br i1 %9, label %.loopexit, label %.preheader11, !llvm.loop !11

.loopexit:                                        ; preds = %.preheader11, %7, %.preheader
  %.0 = phi ptr [ %.08, %.preheader ], [ null, %.preheader11 ], [ %.1, %7 ]
  ret ptr %.0
}

attributes #0 = { nofree norecurse nosync 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" }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; Effective O3 passes: GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass