; LLVM IR from 0intro/wmii :: lib/libstuff/util (trim)

; 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: nounwind uwtable
define dso_local void @trim(ptr noundef %0, ptr noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca ptr, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  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 8, ptr %5) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #2
  %8 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %8, ptr %6, align 8, !tbaa !5
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %9, ptr %7, align 8, !tbaa !5
  br label %10

10:                                               ; preds = %43, %2
  %11 = load ptr, ptr %6, align 8, !tbaa !5
  %12 = load i8, ptr %11, align 1, !tbaa !9
  %13 = icmp ne i8 %12, 0
  br i1 %13, label %14, label %46

14:                                               ; preds = %10
  %15 = load ptr, ptr %4, align 8, !tbaa !5
  store ptr %15, ptr %5, align 8, !tbaa !5
  br label %16

16:                                               ; preds = %30, %14
  %17 = load ptr, ptr %5, align 8, !tbaa !5
  %18 = load i8, ptr %17, align 1, !tbaa !9
  %19 = icmp ne i8 %18, 0
  br i1 %19, label %20, label %33

20:                                               ; preds = %16
  %21 = load ptr, ptr %6, align 8, !tbaa !5
  %22 = load i8, ptr %21, align 1, !tbaa !9
  %23 = sext i8 %22 to i32
  %24 = load ptr, ptr %5, align 8, !tbaa !5
  %25 = load i8, ptr %24, align 1, !tbaa !9
  %26 = sext i8 %25 to i32
  %27 = icmp eq i32 %23, %26
  br i1 %27, label %28, label %29

28:                                               ; preds = %20
  br label %33

29:                                               ; preds = %20
  br label %30

30:                                               ; preds = %29
  %31 = load ptr, ptr %5, align 8, !tbaa !5
  %32 = getelementptr inbounds i8, ptr %31, i32 1
  store ptr %32, ptr %5, align 8, !tbaa !5
  br label %16, !llvm.loop !10

33:                                               ; preds = %28, %16
  %34 = load ptr, ptr %5, align 8, !tbaa !5
  %35 = load i8, ptr %34, align 1, !tbaa !9
  %36 = icmp ne i8 %35, 0
  br i1 %36, label %42, label %37

37:                                               ; preds = %33
  %38 = load ptr, ptr %6, align 8, !tbaa !5
  %39 = load i8, ptr %38, align 1, !tbaa !9
  %40 = load ptr, ptr %7, align 8, !tbaa !5
  %41 = getelementptr inbounds i8, ptr %40, i32 1
  store ptr %41, ptr %7, align 8, !tbaa !5
  store i8 %39, ptr %40, align 1, !tbaa !9
  br label %42

42:                                               ; preds = %37, %33
  br label %43

43:                                               ; preds = %42
  %44 = load ptr, ptr %6, align 8, !tbaa !5
  %45 = getelementptr inbounds i8, ptr %44, i32 1
  store ptr %45, ptr %6, align 8, !tbaa !5
  br label %10, !llvm.loop !12

46:                                               ; preds = %10
  %47 = load ptr, ptr %7, align 8, !tbaa !5
  store i8 0, ptr %47, align 1, !tbaa !9
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  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: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { 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/C++ TBAA"}
!9 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; 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(readwrite, inaccessiblemem: none) uwtable
define dso_local void @trim(ptr nocapture noundef %0, ptr nocapture noundef readonly %1) local_unnamed_addr #0 {
  %3 = load i8, ptr %0, align 1, !tbaa !5
  %.not20 = icmp eq i8 %3, 0
  br i1 %.not20, label %._crit_edge23, label %.preheader

.preheader:                                       ; preds = %2, %.loopexit
  %4 = phi i8 [ %13, %.loopexit ], [ %3, %2 ]
  %.022 = phi ptr [ %.1, %.loopexit ], [ %0, %2 ]
  %.01321 = phi ptr [ %12, %.loopexit ], [ %0, %2 ]
  %5 = load i8, ptr %1, align 1, !tbaa !5
  %.not1618 = icmp eq i8 %5, 0
  br i1 %.not1618, label %._crit_edge, label %.lr.ph

6:                                                ; preds = %.lr.ph
  %7 = getelementptr inbounds i8, ptr %.01419, i64 1
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %.not16 = icmp eq i8 %8, 0
  br i1 %.not16, label %._crit_edge, label %.lr.ph, !llvm.loop !8

.lr.ph:                                           ; preds = %.preheader, %6
  %9 = phi i8 [ %8, %6 ], [ %5, %.preheader ]
  %.01419 = phi ptr [ %7, %6 ], [ %1, %.preheader ]
  %10 = icmp eq i8 %4, %9
  br i1 %10, label %.loopexit, label %6

._crit_edge:                                      ; preds = %6, %.preheader
  %11 = getelementptr inbounds i8, ptr %.022, i64 1
  store i8 %4, ptr %.022, align 1, !tbaa !5
  br label %.loopexit

.loopexit:                                        ; preds = %.lr.ph, %._crit_edge
  %.1 = phi ptr [ %11, %._crit_edge ], [ %.022, %.lr.ph ]
  %12 = getelementptr inbounds i8, ptr %.01321, i64 1
  %13 = load i8, ptr %12, align 1, !tbaa !5
  %.not = icmp eq i8 %13, 0
  br i1 %.not, label %._crit_edge23, label %.preheader, !llvm.loop !10

._crit_edge23:                                    ; preds = %.loopexit, %2
  %.0.lcssa = phi ptr [ %0, %2 ], [ %.1, %.loopexit ]
  store i8 0, ptr %.0.lcssa, align 1, !tbaa !5
  ret void
}

attributes #0 = { nofree norecurse nosync nounwind memory(readwrite, 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/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}
!10 = distinct !{!10, !9}


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