; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (2124)

; 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 zeroext i1 @checkString(ptr noundef %0) #0 {
  %2 = alloca i1, align 1
  %3 = alloca ptr, align 8
  store ptr %0, ptr %3, align 8, !tbaa !5
  br label %4

4:                                                ; preds = %15, %1
  %5 = load ptr, ptr %3, align 8, !tbaa !5
  %6 = load i8, ptr %5, align 1, !tbaa !9
  %7 = icmp ne i8 %6, 0
  br i1 %7, label %8, label %16

8:                                                ; preds = %4
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %9, i32 1
  store ptr %10, ptr %3, align 8, !tbaa !5
  %11 = load i8, ptr %9, align 1, !tbaa !9
  %12 = sext i8 %11 to i32
  %13 = icmp eq i32 %12, 98
  br i1 %13, label %14, label %15

14:                                               ; preds = %8
  br label %16

15:                                               ; preds = %8
  br label %4, !llvm.loop !10

16:                                               ; preds = %14, %4
  br label %17

17:                                               ; preds = %28, %16
  %18 = load ptr, ptr %3, align 8, !tbaa !5
  %19 = load i8, ptr %18, align 1, !tbaa !9
  %20 = icmp ne i8 %19, 0
  br i1 %20, label %21, label %29

21:                                               ; preds = %17
  %22 = load ptr, ptr %3, align 8, !tbaa !5
  %23 = getelementptr inbounds i8, ptr %22, i32 1
  store ptr %23, ptr %3, align 8, !tbaa !5
  %24 = load i8, ptr %22, align 1, !tbaa !9
  %25 = sext i8 %24 to i32
  %26 = icmp eq i32 %25, 97
  br i1 %26, label %27, label %28

27:                                               ; preds = %21
  store i1 false, ptr %2, align 1
  br label %30

28:                                               ; preds = %21
  br label %17, !llvm.loop !12

29:                                               ; preds = %17
  store i1 true, ptr %2, align 1
  br label %30

30:                                               ; preds = %29, %27
  %31 = load i1, ptr %2, align 1
  ret i1 %31
}

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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; 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 zeroext i1 @checkString(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %4, %1
  %.0 = phi ptr [ %0, %1 ], [ %5, %4 ]
  %3 = load i8, ptr %.0, align 1, !tbaa !5
  %.not = icmp eq i8 %3, 0
  br i1 %.not, label %.preheader, label %4

4:                                                ; preds = %2
  %5 = getelementptr inbounds i8, ptr %.0, i64 1
  %6 = icmp eq i8 %3, 98
  br i1 %6, label %.preheader, label %2, !llvm.loop !8

.preheader:                                       ; preds = %4, %2
  %.2.ph = phi ptr [ %.0, %2 ], [ %5, %4 ]
  br label %7

7:                                                ; preds = %.preheader, %7
  %.2 = phi ptr [ %9, %7 ], [ %.2.ph, %.preheader ]
  %8 = load i8, ptr %.2, align 1, !tbaa !5
  %9 = getelementptr inbounds i8, ptr %.2, i64 1
  switch i8 %8, label %7 [
    i8 97, label %10
    i8 0, label %10
  ]

10:                                               ; preds = %7, %7
  %.not8 = icmp eq i8 %8, 0
  ret i1 %.not8
}

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: EarlyCSEPass,GVNPass,GlobalOptPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass