; LLVM IR from DimitrisJim/leetcode_solutions :: C/Algorithms (1689)

; 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 i32 @minPartitions(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  %5 = load ptr, ptr %2, align 8, !tbaa !5
  %6 = getelementptr inbounds i8, ptr %5, i32 1
  store ptr %6, ptr %2, align 8, !tbaa !5
  %7 = load i8, ptr %5, align 1, !tbaa !9
  %8 = sext i8 %7 to i32
  store i32 %8, ptr %3, align 4, !tbaa !10
  br label %9

9:                                                ; preds = %23, %1
  %10 = load ptr, ptr %2, align 8, !tbaa !5
  %11 = load i8, ptr %10, align 1, !tbaa !9
  %12 = icmp ne i8 %11, 0
  br i1 %12, label %13, label %24

13:                                               ; preds = %9
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %14 = load ptr, ptr %2, align 8, !tbaa !5
  %15 = getelementptr inbounds i8, ptr %14, i32 1
  store ptr %15, ptr %2, align 8, !tbaa !5
  %16 = load i8, ptr %14, align 1, !tbaa !9
  %17 = sext i8 %16 to i32
  store i32 %17, ptr %4, align 4, !tbaa !10
  %18 = load i32, ptr %4, align 4, !tbaa !10
  %19 = load i32, ptr %3, align 4, !tbaa !10
  %20 = icmp sgt i32 %18, %19
  br i1 %20, label %21, label %23

21:                                               ; preds = %13
  %22 = load i32, ptr %4, align 4, !tbaa !10
  store i32 %22, ptr %3, align 4, !tbaa !10
  br label %23

23:                                               ; preds = %21, %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  br label %9, !llvm.loop !12

24:                                               ; preds = %9
  %25 = load i32, ptr %3, align 4, !tbaa !10
  %26 = sub nsw i32 %25, 48
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %26
}

; 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 = !{!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"

; Function Attrs: nofree norecurse nosync nounwind memory(read, inaccessiblemem: none) uwtable
define dso_local range(i32 -176, 80) i32 @minPartitions(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i8, ptr %0, align 1, !tbaa !5
  %3 = sext i8 %2 to i32
  %.09 = getelementptr inbounds i8, ptr %0, i64 1
  %4 = load i8, ptr %.09, align 1, !tbaa !5
  %.not10 = icmp eq i8 %4, 0
  br i1 %.not10, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %5 = phi i8 [ %7, %.lr.ph ], [ %4, %1 ]
  %.012 = phi ptr [ %.0, %.lr.ph ], [ %.09, %1 ]
  %.0611 = phi i32 [ %spec.select, %.lr.ph ], [ %3, %1 ]
  %6 = sext i8 %5 to i32
  %spec.select = tail call i32 @llvm.smax.i32(i32 %.0611, i32 %6)
  %.0 = getelementptr inbounds i8, ptr %.012, i64 1
  %7 = load i8, ptr %.0, align 1, !tbaa !5
  %.not = icmp eq i8 %7, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.06.lcssa = phi i32 [ %3, %1 ], [ %spec.select, %.lr.ph ]
  %8 = add nsw i32 %.06.lcssa, -48
  ret i32 %8
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #1

attributes #0 = { nofree norecurse nosync nounwind memory(read, 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" }
attributes #1 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }

!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,IPSCCPPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass