; LLVM IR from kmilo17pet/QuarkTS-cpp :: src/util.ll (ZN3qOS4util6strchrEPKcim)

; 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: mustprogress nounwind uwtable
define dso_local noundef ptr @_ZN3qOS4util6strchrEPKcim(ptr noundef %0, i32 noundef %1, i64 noundef %2) #0 {
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i64, align 8
  %7 = alloca ptr, align 8
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  store i64 %2, ptr %6, align 8, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  store ptr null, ptr %7, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %28, %3
  %9 = load ptr, ptr %4, align 8, !tbaa !5
  %10 = load i8, ptr %9, align 1, !tbaa !13
  %11 = sext i8 %10 to i32
  %12 = load i32, ptr %5, align 4, !tbaa !9
  %13 = icmp eq i32 %11, %12
  br i1 %13, label %14, label %16

14:                                               ; preds = %8
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %15, ptr %7, align 8, !tbaa !5
  br label %30

16:                                               ; preds = %8
  %17 = load i64, ptr %6, align 8, !tbaa !11
  %18 = add i64 %17, -1
  store i64 %18, ptr %6, align 8, !tbaa !11
  br label %19

19:                                               ; preds = %16
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  %21 = getelementptr inbounds i8, ptr %20, i32 1
  store ptr %21, ptr %4, align 8, !tbaa !5
  %22 = load i8, ptr %20, align 1, !tbaa !13
  %23 = sext i8 %22 to i32
  %24 = icmp ne i32 0, %23
  br i1 %24, label %25, label %28

25:                                               ; preds = %19
  %26 = load i64, ptr %6, align 8, !tbaa !11
  %27 = icmp ugt i64 %26, 0
  br label %28

28:                                               ; preds = %25, %19
  %29 = phi i1 [ false, %19 ], [ %27, %25 ]
  br i1 %29, label %8, label %30, !llvm.loop !14

30:                                               ; preds = %28, %14
  %31 = load ptr, ptr %7, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  ret ptr %31
}

; 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 = { mustprogress 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++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"long", !7, i64 0}
!13 = !{!7, !7, i64 0}
!14 = distinct !{!14, !15}
!15 = !{!"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"

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @_ZN3qOS4util6strchrEPKcim(ptr noundef readonly %0, i32 noundef %1, i64 noundef %2) local_unnamed_addr #0 {
  br label %4

4:                                                ; preds = %8, %3
  %.07 = phi ptr [ %0, %3 ], [ %10, %8 ]
  %.06 = phi i64 [ %2, %3 ], [ %9, %8 ]
  %5 = load i8, ptr %.07, align 1, !tbaa !5
  %6 = sext i8 %5 to i32
  %7 = icmp eq i32 %6, %1
  br i1 %7, label %14, label %8

8:                                                ; preds = %4
  %9 = add i64 %.06, -1
  %10 = getelementptr inbounds i8, ptr %.07, i64 1
  %11 = icmp ne i8 %5, 0
  %12 = icmp ne i64 %9, 0
  %13 = select i1 %11, i1 %12, i1 false
  br i1 %13, label %4, label %14, !llvm.loop !8

14:                                               ; preds = %4, %8
  %.0 = phi ptr [ null, %8 ], [ %.07, %4 ]
  ret ptr %.0
}

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn 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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: EarlyCSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass