; LLVM IR from venumb/ZSPACE :: cpp/depends/alglib/cpp/src/ap.ll (ZN6alglib13filter_spacesEPKc)

; 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: mustprogress uwtable
declare dso_local noundef ptr @_ZN11alglib_impl9ae_mallocEmPNS_8ae_stateE(i64 noundef, ptr noundef) #1

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

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN6alglib13filter_spacesEPKc(ptr noundef %0) #1 {
  %2 = alloca ptr, align 8
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca ptr, align 8
  %7 = alloca ptr, align 8
  %8 = alloca i32, align 4
  store ptr %0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %9 = load ptr, ptr %3, align 8, !tbaa !5
  %10 = call i64 @strlen(ptr noundef %9) #4
  store i64 %10, ptr %5, align 8, !tbaa !9
  %11 = load i64, ptr %5, align 8, !tbaa !9
  %12 = add i64 %11, 1
  %13 = call noundef ptr @_ZN11alglib_impl9ae_mallocEmPNS_8ae_stateE(i64 noundef %12, ptr noundef null)
  store ptr %13, ptr %6, align 8, !tbaa !5
  %14 = load ptr, ptr %6, align 8, !tbaa !5
  %15 = icmp eq ptr %14, null
  br i1 %15, label %16, label %18

16:                                               ; preds = %1
  %17 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %17, ptr %2, align 8
  store i32 1, ptr %8, align 4
  br label %44

18:                                               ; preds = %1
  store i64 0, ptr %4, align 8, !tbaa !9
  %19 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %19, ptr %7, align 8, !tbaa !5
  br label %20

20:                                               ; preds = %37, %18
  %21 = load i64, ptr %4, align 8, !tbaa !9
  %22 = load i64, ptr %5, align 8, !tbaa !9
  %23 = icmp ule i64 %21, %22
  br i1 %23, label %24, label %42

24:                                               ; preds = %20
  %25 = load ptr, ptr %3, align 8, !tbaa !5
  %26 = load i8, ptr %25, align 1, !tbaa !11
  %27 = sext i8 %26 to i32
  %28 = call i32 @isspace(i32 noundef %27) #4
  %29 = icmp ne i32 %28, 0
  br i1 %29, label %36, label %30

30:                                               ; preds = %24
  %31 = load ptr, ptr %3, align 8, !tbaa !5
  %32 = load i8, ptr %31, align 1, !tbaa !11
  %33 = load ptr, ptr %7, align 8, !tbaa !5
  store i8 %32, ptr %33, align 1, !tbaa !11
  %34 = load ptr, ptr %7, align 8, !tbaa !5
  %35 = getelementptr inbounds i8, ptr %34, i32 1
  store ptr %35, ptr %7, align 8, !tbaa !5
  br label %36

36:                                               ; preds = %30, %24
  br label %37

37:                                               ; preds = %36
  %38 = load i64, ptr %4, align 8, !tbaa !9
  %39 = add i64 %38, 1
  store i64 %39, ptr %4, align 8, !tbaa !9
  %40 = load ptr, ptr %3, align 8, !tbaa !5
  %41 = getelementptr inbounds i8, ptr %40, i32 1
  store ptr %41, ptr %3, align 8, !tbaa !5
  br label %20, !llvm.loop !12

42:                                               ; preds = %20
  %43 = load ptr, ptr %6, align 8, !tbaa !5
  store ptr %43, ptr %2, align 8
  store i32 1, ptr %8, align 4
  br label %44

44:                                               ; preds = %42, %16
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %6) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  %45 = load ptr, ptr %2, align 8
  ret ptr %45
}

; Function Attrs: nounwind willreturn memory(read)
declare i32 @isspace(i32 noundef) #2

attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #1 = { mustprogress 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 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 = !{!"long", !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: mustprogress uwtable
declare dso_local noundef ptr @_ZN11alglib_impl9ae_mallocEmPNS_8ae_stateE(i64 noundef, ptr noundef) local_unnamed_addr #0

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

; Function Attrs: mustprogress uwtable
define dso_local noundef ptr @_ZN6alglib13filter_spacesEPKc(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = tail call i64 @strlen(ptr noundef nonnull dereferenceable(1) %0) #4
  %3 = add i64 %2, 1
  %4 = tail call noundef ptr @_ZN11alglib_impl9ae_mallocEmPNS_8ae_stateE(i64 noundef %3, ptr noundef null)
  %5 = icmp eq ptr %4, null
  br i1 %5, label %.loopexit, label %.preheader.preheader

.preheader.preheader:                             ; preds = %1
  %umax = tail call i64 @llvm.umax.i64(i64 %3, i64 1)
  br label %.preheader

.preheader:                                       ; preds = %.preheader.preheader, %11
  %.021 = phi ptr [ %.1, %11 ], [ %4, %.preheader.preheader ]
  %.01520 = phi ptr [ %13, %11 ], [ %0, %.preheader.preheader ]
  %.01619 = phi i64 [ %12, %11 ], [ 0, %.preheader.preheader ]
  %6 = load i8, ptr %.01520, align 1, !tbaa !5
  %7 = sext i8 %6 to i32
  %8 = tail call i32 @isspace(i32 noundef %7) #4
  %.not18 = icmp eq i32 %8, 0
  br i1 %.not18, label %9, label %11

9:                                                ; preds = %.preheader
  store i8 %6, ptr %.021, align 1, !tbaa !5
  %10 = getelementptr inbounds i8, ptr %.021, i64 1
  br label %11

11:                                               ; preds = %.preheader, %9
  %.1 = phi ptr [ %.021, %.preheader ], [ %10, %9 ]
  %12 = add nuw i64 %.01619, 1
  %13 = getelementptr inbounds i8, ptr %.01520, i64 1
  %exitcond = icmp eq i64 %12, %umax
  br i1 %exitcond, label %.loopexit, label %.preheader, !llvm.loop !8

.loopexit:                                        ; preds = %11, %1
  ret ptr %4
}

; Function Attrs: mustprogress nofree nounwind willreturn memory(read)
declare i32 @isspace(i32 noundef) local_unnamed_addr #2

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i64 @llvm.umax.i64(i64, i64) #3

attributes #0 = { mustprogress 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 = { mustprogress nofree 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 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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