; LLVM IR from SSBMTonberry/pocketlzma :: ref_spec/lzma1900/CPP/Common/MyString.ll (Z19FindCharPosInStringPKcc)

; 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 i32 @_Z19FindCharPosInStringPKcc(ptr noundef %0, i8 noundef signext %1) #0 {
  %3 = alloca i32, align 4
  %4 = alloca ptr, align 8
  %5 = alloca i8, align 1
  %6 = alloca ptr, align 8
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i8 %1, ptr %5, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  %8 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %8, ptr %6, align 8, !tbaa !5
  br label %9

9:                                                ; preds = %30, %2
  %10 = load ptr, ptr %6, align 8, !tbaa !5
  %11 = load i8, ptr %10, align 1, !tbaa !9
  %12 = sext i8 %11 to i32
  %13 = load i8, ptr %5, align 1, !tbaa !9
  %14 = sext i8 %13 to i32
  %15 = icmp eq i32 %12, %14
  br i1 %15, label %16, label %23

16:                                               ; preds = %9
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  %18 = load ptr, ptr %4, align 8, !tbaa !5
  %19 = ptrtoint ptr %17 to i64
  %20 = ptrtoint ptr %18 to i64
  %21 = sub i64 %19, %20
  %22 = trunc i64 %21 to i32
  store i32 %22, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %33

23:                                               ; preds = %9
  %24 = load ptr, ptr %6, align 8, !tbaa !5
  %25 = load i8, ptr %24, align 1, !tbaa !9
  %26 = sext i8 %25 to i32
  %27 = icmp eq i32 %26, 0
  br i1 %27, label %28, label %29

28:                                               ; preds = %23
  store i32 -1, ptr %3, align 4
  store i32 1, ptr %7, align 4
  br label %33

29:                                               ; preds = %23
  br label %30

30:                                               ; preds = %29
  %31 = load ptr, ptr %6, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %31, i32 1
  store ptr %32, ptr %6, align 8, !tbaa !5
  br label %9, !llvm.loop !10

33:                                               ; preds = %28, %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  %34 = load i32, ptr %3, align 4
  ret i32 %34
}

; 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 = !{!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: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef i32 @_Z19FindCharPosInStringPKcc(ptr noundef %0, i8 noundef signext %1) local_unnamed_addr #0 {
  %3 = load i8, ptr %0, align 1, !tbaa !5
  %4 = icmp eq i8 %3, %1
  br i1 %4, label %._crit_edge, label %.lr.ph

._crit_edge:                                      ; preds = %11, %2
  %.0.lcssa = phi ptr [ %0, %2 ], [ %12, %11 ]
  %5 = ptrtoint ptr %.0.lcssa to i64
  %6 = ptrtoint ptr %0 to i64
  %7 = sub i64 %5, %6
  %8 = trunc i64 %7 to i32
  br label %.loopexit

.lr.ph:                                           ; preds = %2, %11
  %9 = phi i8 [ %13, %11 ], [ %3, %2 ]
  %.010 = phi ptr [ %12, %11 ], [ %0, %2 ]
  %10 = icmp eq i8 %9, 0
  br i1 %10, label %.loopexit, label %11

11:                                               ; preds = %.lr.ph
  %12 = getelementptr inbounds i8, ptr %.010, i64 1
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %14 = icmp eq i8 %13, %1
  br i1 %14, label %._crit_edge, label %.lr.ph, !llvm.loop !8

.loopexit:                                        ; preds = %.lr.ph, %._crit_edge
  %.07 = phi i32 [ %8, %._crit_edge ], [ -1, %.lr.ph ]
  ret i32 %.07
}

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,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass