; LLVM IR from narke/Aragveli :: src/kernel/lib/c (string)

; 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 @strchr(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %21, %2
  %7 = load ptr, ptr %4, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %7, i32 1
  store ptr %8, ptr %4, align 8, !tbaa !5
  %9 = load i8, ptr %7, align 1, !tbaa !11
  %10 = icmp ne i8 %9, 0
  br i1 %10, label %11, label %22

11:                                               ; preds = %6
  %12 = load ptr, ptr %4, align 8, !tbaa !5
  %13 = load i8, ptr %12, align 1, !tbaa !11
  %14 = sext i8 %13 to i32
  %15 = load i32, ptr %5, align 4, !tbaa !9
  %16 = trunc i32 %15 to i8
  %17 = sext i8 %16 to i32
  %18 = icmp eq i32 %14, %17
  br i1 %18, label %19, label %21

19:                                               ; preds = %11
  %20 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %20, ptr %3, align 8
  br label %23

21:                                               ; preds = %11
  br label %6, !llvm.loop !12

22:                                               ; preds = %6
  store ptr null, ptr %3, align 8
  br label %23

23:                                               ; preds = %22, %19
  %24 = load ptr, ptr %3, align 8
  ret ptr %24
}

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 = !{!"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 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"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: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local noundef ptr @strchr(ptr noundef readonly %0, i32 noundef %1) local_unnamed_addr #0 {
  %.pr = load i8, ptr %0, align 1, !tbaa !5
  %sext = shl i32 %1, 24
  %3 = ashr exact i32 %sext, 24
  br label %4

4:                                                ; preds = %6, %2
  %5 = phi i8 [ %8, %6 ], [ %.pr, %2 ]
  %.04 = phi ptr [ %7, %6 ], [ %0, %2 ]
  %.not = icmp eq i8 %5, 0
  br i1 %.not, label %11, label %6

6:                                                ; preds = %4
  %7 = getelementptr inbounds i8, ptr %.04, i64 1
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %9 = sext i8 %8 to i32
  %10 = icmp eq i32 %3, %9
  br i1 %10, label %11, label %4, !llvm.loop !8

11:                                               ; preds = %4, %6
  %.0 = phi ptr [ %7, %6 ], [ null, %4 ]
  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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


; Effective O3 passes: GlobalOptPass,InstCombinePass,JumpThreadingPass,LICMPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass