; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1816)

; 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 ptr @truncateSentence(ptr noundef %0, i32 noundef %1) #0 {
  %3 = alloca ptr, align 8
  %4 = alloca i32, align 4
  %5 = alloca ptr, align 8
  %6 = alloca i32, align 4
  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 8, ptr %5) #2
  %7 = load ptr, ptr %3, align 8, !tbaa !5
  store ptr %7, ptr %5, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  store i32 0, ptr %6, align 4, !tbaa !9
  br label %8

8:                                                ; preds = %29, %2
  %9 = load ptr, ptr %5, align 8, !tbaa !5
  %10 = load i8, ptr %9, align 1, !tbaa !11
  %11 = icmp ne i8 %10, 0
  br i1 %11, label %12, label %32

12:                                               ; preds = %8
  %13 = load ptr, ptr %5, align 8, !tbaa !5
  %14 = getelementptr inbounds i8, ptr %13, i32 1
  store ptr %14, ptr %5, align 8, !tbaa !5
  %15 = load i8, ptr %13, align 1, !tbaa !11
  %16 = sext i8 %15 to i32
  %17 = icmp eq i32 %16, 32
  br i1 %17, label %18, label %21

18:                                               ; preds = %12
  %19 = load i32, ptr %4, align 4, !tbaa !9
  %20 = add nsw i32 %19, -1
  store i32 %20, ptr %4, align 4, !tbaa !9
  br label %21

21:                                               ; preds = %18, %12
  %22 = load i32, ptr %4, align 4, !tbaa !9
  %23 = icmp eq i32 %22, 0
  br i1 %23, label %24, label %29

24:                                               ; preds = %21
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load i32, ptr %6, align 4, !tbaa !9
  %27 = sext i32 %26 to i64
  %28 = getelementptr inbounds i8, ptr %25, i64 %27
  store i8 0, ptr %28, align 1, !tbaa !11
  br label %32

29:                                               ; preds = %21
  %30 = load i32, ptr %6, align 4, !tbaa !9
  %31 = add nsw i32 %30, 1
  store i32 %31, ptr %6, align 4, !tbaa !9
  br label %8, !llvm.loop !12

32:                                               ; preds = %24, %8
  %33 = load ptr, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #2
  ret ptr %33
}

; 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 = !{!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(read, argmem: readwrite, inaccessiblemem: none) uwtable
define dso_local noundef ptr @truncateSentence(ptr noundef returned %0, i32 noundef %1) local_unnamed_addr #0 {
  %3 = load i8, ptr %0, align 1, !tbaa !5
  %.not12 = icmp eq i8 %3, 0
  br i1 %.not12, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %2, %11
  %4 = phi i8 [ %14, %11 ], [ %3, %2 ]
  %.015 = phi i32 [ %13, %11 ], [ 0, %2 ]
  %.0814 = phi ptr [ %12, %11 ], [ %0, %2 ]
  %.0913 = phi i32 [ %spec.select, %11 ], [ %1, %2 ]
  %5 = icmp eq i8 %4, 32
  %6 = sext i1 %5 to i32
  %spec.select = add nsw i32 %.0913, %6
  %7 = icmp eq i32 %spec.select, 0
  br i1 %7, label %8, label %11

8:                                                ; preds = %.lr.ph
  %9 = zext nneg i32 %.015 to i64
  %10 = getelementptr inbounds i8, ptr %0, i64 %9
  store i8 0, ptr %10, align 1, !tbaa !5
  br label %.loopexit

11:                                               ; preds = %.lr.ph
  %12 = getelementptr inbounds i8, ptr %.0814, i64 1
  %13 = add nuw nsw i32 %.015, 1
  %14 = load i8, ptr %12, align 1, !tbaa !5
  %.not = icmp eq i8 %14, 0
  br i1 %.not, label %.loopexit, label %.lr.ph, !llvm.loop !8

.loopexit:                                        ; preds = %11, %2, %8
  ret ptr %0
}

attributes #0 = { nofree norecurse nosync nounwind memory(read, argmem: 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"}


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