; LLVM IR from xing1357/SimpleOS :: src (string)

; 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"

@.str = external hidden unnamed_addr constant [2 x i8], align 1

; 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: nounwind uwtable
define dso_local i32 @strsplit(ptr noundef %0, i8 noundef signext %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i8, align 1
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i8 %1, ptr %4, align 1, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #3
  store i32 0, ptr %5, align 4, !tbaa !10
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #3
  store i32 0, ptr %6, align 4, !tbaa !10
  br label %7

7:                                                ; preds = %31, %2
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  %9 = load i32, ptr %6, align 4, !tbaa !10
  %10 = zext i32 %9 to i64
  %11 = getelementptr inbounds i8, ptr %8, i64 %10
  %12 = load i8, ptr %11, align 1, !tbaa !9
  %13 = icmp ne i8 %12, 0
  br i1 %13, label %14, label %34

14:                                               ; preds = %7
  %15 = load ptr, ptr %3, align 8, !tbaa !5
  %16 = load i32, ptr %6, align 4, !tbaa !10
  %17 = zext i32 %16 to i64
  %18 = getelementptr inbounds i8, ptr %15, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !9
  %20 = sext i8 %19 to i32
  %21 = load i8, ptr %4, align 1, !tbaa !9
  %22 = sext i8 %21 to i32
  %23 = icmp eq i32 %20, %22
  br i1 %23, label %24, label %31

24:                                               ; preds = %14
  call void (ptr, ...) @printf(ptr noundef @.str)
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load i32, ptr %6, align 4, !tbaa !10
  %27 = zext i32 %26 to i64
  %28 = getelementptr inbounds i8, ptr %25, i64 %27
  store i8 0, ptr %28, align 1, !tbaa !9
  %29 = load i32, ptr %5, align 4, !tbaa !10
  %30 = add i32 %29, 1
  store i32 %30, ptr %5, align 4, !tbaa !10
  br label %31

31:                                               ; preds = %24, %14
  %32 = load i32, ptr %6, align 4, !tbaa !10
  %33 = add i32 %32, 1
  store i32 %33, ptr %6, align 4, !tbaa !10
  br label %7, !llvm.loop !12

34:                                               ; preds = %7
  %35 = load i32, ptr %5, align 4, !tbaa !10
  %36 = add i32 %35, 1
  store i32 %36, ptr %5, align 4, !tbaa !10
  %37 = load i32, ptr %5, align 4, !tbaa !10
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #3
  ret i32 %37
}

declare void @printf(ptr noundef, ...) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { 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 = { "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 }

!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 = !{!11, !11, i64 0}
!11 = !{!"int", !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"

@.str = external hidden unnamed_addr constant [2 x i8], align 1

; Function Attrs: nounwind uwtable
define dso_local i32 @strsplit(ptr nocapture noundef %0, i8 noundef signext %1) local_unnamed_addr #0 {
  %3 = load i8, ptr %0, align 1, !tbaa !5
  %.not12 = icmp eq i8 %3, 0
  br i1 %.not12, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %2, %9
  %4 = phi i8 [ %13, %9 ], [ %3, %2 ]
  %5 = phi ptr [ %12, %9 ], [ %0, %2 ]
  %.014 = phi i32 [ %10, %9 ], [ 0, %2 ]
  %.01013 = phi i32 [ %.1, %9 ], [ 0, %2 ]
  %6 = icmp eq i8 %4, %1
  br i1 %6, label %7, label %9

7:                                                ; preds = %.lr.ph
  tail call void (ptr, ...) @printf(ptr noundef nonnull @.str) #2
  store i8 0, ptr %5, align 1, !tbaa !5
  %8 = add i32 %.01013, 1
  br label %9

9:                                                ; preds = %7, %.lr.ph
  %.1 = phi i32 [ %8, %7 ], [ %.01013, %.lr.ph ]
  %10 = add i32 %.014, 1
  %11 = zext i32 %10 to i64
  %12 = getelementptr inbounds i8, ptr %0, i64 %11
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %.not = icmp eq i8 %13, 0
  br i1 %.not, label %._crit_edge.loopexit, label %.lr.ph, !llvm.loop !8

._crit_edge.loopexit:                             ; preds = %9
  %14 = add i32 %.1, 1
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %2
  %.010.lcssa = phi i32 [ 1, %2 ], [ %14, %._crit_edge.loopexit ]
  ret i32 %.010.lcssa
}

declare void @printf(ptr noundef, ...) local_unnamed_addr #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 = { "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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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