; LLVM IR from lolosssss/leetcode :: c (290_word_pattern)

; 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 i8 @hash(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i8, align 1
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 1, ptr %3) #2
  store i8 0, ptr %3, align 1, !tbaa !9
  br label %4

4:                                                ; preds = %28, %1
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = load i8, ptr %5, align 1, !tbaa !9
  %7 = sext i8 %6 to i32
  %8 = icmp ne i32 %7, 0
  br i1 %8, label %9, label %14

9:                                                ; preds = %4
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  %11 = load i8, ptr %10, align 1, !tbaa !9
  %12 = sext i8 %11 to i32
  %13 = icmp ne i32 %12, 32
  br label %14

14:                                               ; preds = %9, %4
  %15 = phi i1 [ false, %4 ], [ %13, %9 ]
  br i1 %15, label %16, label %31

16:                                               ; preds = %14
  %17 = load i8, ptr %3, align 1, !tbaa !9
  %18 = zext i8 %17 to i32
  %19 = mul nsw i32 31, %18
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = load i8, ptr %20, align 1, !tbaa !9
  %22 = sext i8 %21 to i32
  %23 = add nsw i32 %19, %22
  %24 = load i8, ptr %3, align 1, !tbaa !9
  %25 = zext i8 %24 to i32
  %26 = add nsw i32 %25, %23
  %27 = trunc i32 %26 to i8
  store i8 %27, ptr %3, align 1, !tbaa !9
  br label %28

28:                                               ; preds = %16
  %29 = load ptr, ptr %2, align 8, !tbaa !5
  %30 = getelementptr inbounds i8, ptr %29, i32 1
  store ptr %30, ptr %2, align 8, !tbaa !5
  br label %4, !llvm.loop !10

31:                                               ; preds = %14
  %32 = load i8, ptr %3, align 1, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 1, ptr %3) #2
  ret i8 %32
}

; 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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"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 zeroext i8 @hash(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  br label %2

2:                                                ; preds = %4, %1
  %.06 = phi ptr [ %0, %1 ], [ %8, %4 ]
  %.0 = phi i8 [ 0, %1 ], [ %7, %4 ]
  %3 = load i8, ptr %.06, align 1, !tbaa !5
  switch i8 %3, label %4 [
    i8 0, label %.critedge
    i8 32, label %.critedge
  ]

4:                                                ; preds = %2
  %5 = mul i8 %.0, 31
  %6 = add i8 %3, %.0
  %7 = add i8 %6, %5
  %8 = getelementptr inbounds i8, ptr %.06, i64 1
  br label %2, !llvm.loop !8

.critedge:                                        ; preds = %2, %2
  ret i8 %.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: EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,LCSSAPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass