; LLVM IR from SSBMTonberry/pocketlzma :: ref_spec/lzma1900/CPP/Common/MyString.ll (Z21StringsAreEqual_AsciiPKwPKc)

; 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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #0

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef zeroext i1 @_Z21StringsAreEqual_AsciiPKwPKc(ptr noundef %0, ptr noundef %1) #1 {
  %3 = alloca i1, align 1
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca i8, align 1
  %7 = alloca i32, align 4
  store ptr %0, ptr %4, align 8, !tbaa !5
  store ptr %1, ptr %5, align 8, !tbaa !5
  br label %8

8:                                                ; preds = %29, %2
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #2
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = load i8, ptr %9, align 1, !tbaa !9
  store i8 %10, ptr %6, align 1, !tbaa !9
  %11 = load i8, ptr %6, align 1, !tbaa !9
  %12 = zext i8 %11 to i32
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = load i32, ptr %13, align 4, !tbaa !10
  %15 = icmp ne i32 %12, %14
  br i1 %15, label %16, label %17

16:                                               ; preds = %8
  store i1 false, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %27

17:                                               ; preds = %8
  %18 = load i8, ptr %6, align 1, !tbaa !9
  %19 = zext i8 %18 to i32
  %20 = icmp eq i32 %19, 0
  br i1 %20, label %21, label %22

21:                                               ; preds = %17
  store i1 true, ptr %3, align 1
  store i32 1, ptr %7, align 4
  br label %27

22:                                               ; preds = %17
  %23 = load ptr, ptr %5, align 8, !tbaa !5
  %24 = getelementptr inbounds i8, ptr %23, i32 1
  store ptr %24, ptr %5, align 8, !tbaa !5
  %25 = load ptr, ptr %4, align 8, !tbaa !5
  %26 = getelementptr inbounds i32, ptr %25, i32 1
  store ptr %26, ptr %4, align 8, !tbaa !5
  store i32 0, ptr %7, align 4
  br label %27

27:                                               ; preds = %22, %21, %16
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #2
  %28 = load i32, ptr %7, align 4
  switch i32 %28, label %32 [
    i32 0, label %29
    i32 1, label %30
  ]

29:                                               ; preds = %27
  br label %8, !llvm.loop !12

30:                                               ; preds = %27
  %31 = load i1, ptr %3, align 1
  ret i1 %31

32:                                               ; preds = %27
  unreachable
}

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 #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 = !{!11, !11, i64 0}
!11 = !{!"wchar_t", !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: mustprogress nofree norecurse nosync nounwind willreturn memory(read, inaccessiblemem: none) uwtable
define dso_local noundef zeroext i1 @_Z21StringsAreEqual_AsciiPKwPKc(ptr nocapture noundef readonly %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = load i8, ptr %1, align 1, !tbaa !5
  %4 = zext i8 %3 to i32
  %5 = load i32, ptr %0, align 4, !tbaa !8
  %.not19 = icmp eq i32 %5, %4
  %6 = icmp ne i8 %3, 0
  %or.cond21.not = and i1 %6, %.not19
  br i1 %or.cond21.not, label %.lr.ph, label %._crit_edge

.lr.ph:                                           ; preds = %2, %.lr.ph
  %.0823 = phi ptr [ %7, %.lr.ph ], [ %1, %2 ]
  %.01022 = phi ptr [ %8, %.lr.ph ], [ %0, %2 ]
  %7 = getelementptr inbounds i8, ptr %.0823, i64 1
  %8 = getelementptr inbounds i8, ptr %.01022, i64 4
  %9 = load i8, ptr %7, align 1, !tbaa !5
  %10 = zext i8 %9 to i32
  %11 = load i32, ptr %8, align 4, !tbaa !8
  %.not = icmp eq i32 %11, %10
  %12 = icmp ne i8 %9, 0
  %or.cond.not = and i1 %12, %.not
  br i1 %or.cond.not, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %.lr.ph, %2
  %.not.lcssa = phi i1 [ %.not19, %2 ], [ %.not, %.lr.ph ]
  ret i1 %.not.lcssa
}

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 = !{!9, !9, i64 0}
!9 = !{!"wchar_t", !6, i64 0}


; Effective O3 passes: CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,ReassociatePass,SROAPass,SimplifyCFGPass