; LLVM IR from sunkafei/xcpc-algorithm-templates :: 算法/字符串算法/KMP算法.ll (Z7getfailPcPi)

; 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 void @_Z7getfailPcPi(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store ptr %1, ptr %4, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = call i64 @strlen(ptr noundef %8) #4
  %10 = trunc i64 %9 to i32
  store i32 %10, ptr %5, align 4, !tbaa !9
  %11 = load ptr, ptr %4, align 8, !tbaa !5
  %12 = getelementptr inbounds i32, ptr %11, i64 0
  store i32 0, ptr %12, align 4, !tbaa !9
  %13 = load ptr, ptr %4, align 8, !tbaa !5
  %14 = getelementptr inbounds i32, ptr %13, i64 1
  store i32 0, ptr %14, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 1, ptr %6, align 4, !tbaa !9
  br label %15

15:                                               ; preds = %76, %2
  %16 = load i32, ptr %6, align 4, !tbaa !9
  %17 = load i32, ptr %5, align 4, !tbaa !9
  %18 = icmp slt i32 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  br label %79

20:                                               ; preds = %15
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #3
  %21 = load ptr, ptr %4, align 8, !tbaa !5
  %22 = load i32, ptr %6, align 4, !tbaa !9
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i32, ptr %21, i64 %23
  %25 = load i32, ptr %24, align 4, !tbaa !9
  store i32 %25, ptr %7, align 4, !tbaa !9
  br label %26

26:                                               ; preds = %45, %20
  %27 = load i32, ptr %7, align 4, !tbaa !9
  %28 = icmp ne i32 %27, 0
  br i1 %28, label %29, label %43

29:                                               ; preds = %26
  %30 = load ptr, ptr %3, align 8, !tbaa !5
  %31 = load i32, ptr %7, align 4, !tbaa !9
  %32 = sext i32 %31 to i64
  %33 = getelementptr inbounds i8, ptr %30, i64 %32
  %34 = load i8, ptr %33, align 1, !tbaa !11
  %35 = sext i8 %34 to i32
  %36 = load ptr, ptr %3, align 8, !tbaa !5
  %37 = load i32, ptr %6, align 4, !tbaa !9
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i8, ptr %36, i64 %38
  %40 = load i8, ptr %39, align 1, !tbaa !11
  %41 = sext i8 %40 to i32
  %42 = icmp ne i32 %35, %41
  br label %43

43:                                               ; preds = %29, %26
  %44 = phi i1 [ false, %26 ], [ %42, %29 ]
  br i1 %44, label %45, label %51

45:                                               ; preds = %43
  %46 = load ptr, ptr %4, align 8, !tbaa !5
  %47 = load i32, ptr %7, align 4, !tbaa !9
  %48 = sext i32 %47 to i64
  %49 = getelementptr inbounds i32, ptr %46, i64 %48
  %50 = load i32, ptr %49, align 4, !tbaa !9
  store i32 %50, ptr %7, align 4, !tbaa !9
  br label %26, !llvm.loop !12

51:                                               ; preds = %43
  %52 = load ptr, ptr %3, align 8, !tbaa !5
  %53 = load i32, ptr %7, align 4, !tbaa !9
  %54 = sext i32 %53 to i64
  %55 = getelementptr inbounds i8, ptr %52, i64 %54
  %56 = load i8, ptr %55, align 1, !tbaa !11
  %57 = sext i8 %56 to i32
  %58 = load ptr, ptr %3, align 8, !tbaa !5
  %59 = load i32, ptr %6, align 4, !tbaa !9
  %60 = sext i32 %59 to i64
  %61 = getelementptr inbounds i8, ptr %58, i64 %60
  %62 = load i8, ptr %61, align 1, !tbaa !11
  %63 = sext i8 %62 to i32
  %64 = icmp eq i32 %57, %63
  br i1 %64, label %65, label %68

65:                                               ; preds = %51
  %66 = load i32, ptr %7, align 4, !tbaa !9
  %67 = add nsw i32 %66, 1
  br label %69

68:                                               ; preds = %51
  br label %69

69:                                               ; preds = %68, %65
  %70 = phi i32 [ %67, %65 ], [ 0, %68 ]
  %71 = load ptr, ptr %4, align 8, !tbaa !5
  %72 = load i32, ptr %6, align 4, !tbaa !9
  %73 = add nsw i32 %72, 1
  %74 = sext i32 %73 to i64
  %75 = getelementptr inbounds i32, ptr %71, i64 %74
  store i32 %70, ptr %75, align 4, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #3
  br label %76

76:                                               ; preds = %69
  %77 = load i32, ptr %6, align 4, !tbaa !9
  %78 = add nsw i32 %77, 1
  store i32 %78, ptr %6, align 4, !tbaa !9
  br label %15, !llvm.loop !14

79:                                               ; preds = %19
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret void
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind willreturn memory(read)
declare i64 @strlen(ptr noundef) #2

; 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 willreturn memory(read) "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 #3 = { nounwind }
attributes #4 = { nounwind willreturn memory(read) }

!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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !7, i64 0}
!12 = distinct !{!12, !13}
!13 = !{!"llvm.loop.mustprogress"}
!14 = distinct !{!14, !13}


; 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 nounwind memory(argmem: readwrite) uwtable
define dso_local void @_Z7getfailPcPi(ptr nocapture noundef readonly %0, ptr nocapture noundef %1) local_unnamed_addr #0 {
  %3 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #2
  %4 = trunc i64 %3 to i32
  store i32 0, ptr %1, align 4, !tbaa !5
  %5 = getelementptr inbounds i8, ptr %1, i64 4
  store i32 0, ptr %5, align 4, !tbaa !5
  %6 = icmp sgt i32 %4, 1
  br i1 %6, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %wide.trip.count = and i64 %3, 2147483647
  br label %.lr.ph

._crit_edge:                                      ; preds = %.critedge, %2
  ret void

.lr.ph:                                           ; preds = %.lr.ph.preheader, %.critedge
  %indvars.iv = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next, %.critedge ]
  %7 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv
  br label %8

8:                                                ; preds = %9, %.lr.ph
  %.pn = phi i64 [ %indvars.iv, %.lr.ph ], [ %10, %9 ]
  %.0.in = getelementptr inbounds i32, ptr %1, i64 %.pn
  %.0 = load i32, ptr %.0.in, align 4, !tbaa !5
  %.not = icmp eq i32 %.0, 0
  br i1 %.not, label %..critedge_crit_edge, label %9

..critedge_crit_edge:                             ; preds = %8
  %.pre = load i8, ptr %0, align 1, !tbaa !9
  %.pre25 = load i8, ptr %7, align 1, !tbaa !9
  br label %.critedge

9:                                                ; preds = %8
  %10 = sext i32 %.0 to i64
  %11 = getelementptr inbounds i8, ptr %0, i64 %10
  %12 = load i8, ptr %11, align 1, !tbaa !9
  %13 = load i8, ptr %7, align 1, !tbaa !9
  %.not22 = icmp eq i8 %12, %13
  br i1 %.not22, label %.critedge, label %8, !llvm.loop !10

.critedge:                                        ; preds = %9, %..critedge_crit_edge
  %14 = phi i8 [ %.pre25, %..critedge_crit_edge ], [ %12, %9 ]
  %15 = phi i8 [ %.pre, %..critedge_crit_edge ], [ %12, %9 ]
  %16 = icmp eq i8 %15, %14
  %17 = add nsw i32 %.0, 1
  %18 = select i1 %16, i32 %17, i32 0
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %19 = getelementptr inbounds i32, ptr %1, i64 %indvars.iv.next
  store i32 %18, ptr %19, align 4, !tbaa !5
  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
  br i1 %exitcond.not, label %._crit_edge, label %.lr.ph, !llvm.loop !12
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(argmem: read)
declare i64 @strlen(ptr nocapture noundef) local_unnamed_addr #1

attributes #0 = { mustprogress nofree nounwind memory(argmem: readwrite) 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 = { mustprogress nofree nounwind willreturn memory(argmem: read) "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 willreturn memory(read) }

!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 = !{!"int", !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"}
!12 = distinct !{!12, !11}


; Effective O3 passes: BDCEPass,CorrelatedValuePropagationPass,EarlyCSEPass,GVNPass,GlobalOptPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LICMPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass