; LLVM IR from zhemao/libds :: strutils (str_strip)

; 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: nounwind uwtable
define dso_local void @str_strip(ptr noundef %0, i32 noundef %1) #1 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i8, align 1
  store ptr %0, ptr %3, align 8, !tbaa !5
  store i32 %1, ptr %4, align 4, !tbaa !9
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 1, ptr %6) #2
  %7 = load i32, ptr %4, align 4, !tbaa !9
  %8 = sub nsw i32 %7, 1
  store i32 %8, ptr %5, align 4, !tbaa !9
  br label %9

9:                                                ; preds = %40, %2
  %10 = load i32, ptr %5, align 4, !tbaa !9
  %11 = icmp sge i32 %10, 0
  br i1 %11, label %12, label %43

12:                                               ; preds = %9
  %13 = load ptr, ptr %3, align 8, !tbaa !5
  %14 = load i32, ptr %5, align 4, !tbaa !9
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i8, ptr %13, i64 %15
  %17 = load i8, ptr %16, align 1, !tbaa !11
  store i8 %17, ptr %6, align 1, !tbaa !11
  %18 = load i8, ptr %6, align 1, !tbaa !11
  %19 = sext i8 %18 to i32
  %20 = icmp eq i32 %19, 10
  br i1 %20, label %33, label %21

21:                                               ; preds = %12
  %22 = load i8, ptr %6, align 1, !tbaa !11
  %23 = sext i8 %22 to i32
  %24 = icmp eq i32 %23, 13
  br i1 %24, label %33, label %25

25:                                               ; preds = %21
  %26 = load i8, ptr %6, align 1, !tbaa !11
  %27 = sext i8 %26 to i32
  %28 = icmp eq i32 %27, 9
  br i1 %28, label %33, label %29

29:                                               ; preds = %25
  %30 = load i8, ptr %6, align 1, !tbaa !11
  %31 = sext i8 %30 to i32
  %32 = icmp eq i32 %31, 32
  br i1 %32, label %33, label %38

33:                                               ; preds = %29, %25, %21, %12
  %34 = load ptr, ptr %3, align 8, !tbaa !5
  %35 = load i32, ptr %5, align 4, !tbaa !9
  %36 = sext i32 %35 to i64
  %37 = getelementptr inbounds i8, ptr %34, i64 %36
  store i8 0, ptr %37, align 1, !tbaa !11
  br label %39

38:                                               ; preds = %29
  br label %43

39:                                               ; preds = %33
  br label %40

40:                                               ; preds = %39
  %41 = load i32, ptr %5, align 4, !tbaa !9
  %42 = add nsw i32 %41, -1
  store i32 %42, ptr %5, align 4, !tbaa !9
  br label %9, !llvm.loop !12

43:                                               ; preds = %38, %9
  call void @llvm.lifetime.end.p0(i64 1, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  ret void
}

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 = { 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 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = !{!7, !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: nofree norecurse nosync nounwind memory(argmem: readwrite) uwtable
define dso_local void @str_strip(ptr nocapture noundef %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = icmp sgt i32 %1, 0
  br i1 %3, label %.lr.ph.preheader, label %._crit_edge

.lr.ph.preheader:                                 ; preds = %2
  %4 = zext nneg i32 %1 to i64
  br label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph.preheader, %7
  %indvars.iv = phi i64 [ %4, %.lr.ph.preheader ], [ %indvars.iv.next, %7 ]
  %indvars.iv.next = add nsw i64 %indvars.iv, -1
  %5 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  %6 = load i8, ptr %5, align 1, !tbaa !5
  switch i8 %6, label %._crit_edge [
    i8 32, label %7
    i8 13, label %7
    i8 10, label %7
    i8 9, label %7
  ]

7:                                                ; preds = %.lr.ph, %.lr.ph, %.lr.ph, %.lr.ph
  store i8 0, ptr %5, align 1, !tbaa !5
  %8 = icmp ugt i64 %indvars.iv, 1
  br i1 %8, label %.lr.ph, label %._crit_edge, !llvm.loop !8

._crit_edge:                                      ; preds = %7, %.lr.ph, %2
  ret void
}

attributes #0 = { nofree norecurse nosync 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" }

!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: CorrelatedValuePropagationPass,EarlyCSEPass,GlobalOptPass,IPSCCPPass,IndVarSimplifyPass,InferFunctionAttrsPass,InstCombinePass,JumpThreadingPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass