; LLVM IR from LeetCode-in-C/LeetCode-in-C :: src/main/c/g0001_0100/s0084_largest_rectangle_in_histogram (Solution)

; 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 @maxOfThreeNums(i32 noundef %0, i32 noundef %1, i32 noundef %2) #0 {
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store i32 %0, ptr %4, align 4, !tbaa !5
  store i32 %1, ptr %5, align 4, !tbaa !5
  store i32 %2, ptr %6, align 4, !tbaa !5
  %7 = load i32, ptr %4, align 4, !tbaa !5
  %8 = load i32, ptr %5, align 4, !tbaa !5
  %9 = icmp sgt i32 %7, %8
  br i1 %9, label %10, label %20

10:                                               ; preds = %3
  %11 = load i32, ptr %4, align 4, !tbaa !5
  %12 = load i32, ptr %6, align 4, !tbaa !5
  %13 = icmp sgt i32 %11, %12
  br i1 %13, label %14, label %16

14:                                               ; preds = %10
  %15 = load i32, ptr %4, align 4, !tbaa !5
  br label %18

16:                                               ; preds = %10
  %17 = load i32, ptr %6, align 4, !tbaa !5
  br label %18

18:                                               ; preds = %16, %14
  %19 = phi i32 [ %15, %14 ], [ %17, %16 ]
  br label %30

20:                                               ; preds = %3
  %21 = load i32, ptr %5, align 4, !tbaa !5
  %22 = load i32, ptr %6, align 4, !tbaa !5
  %23 = icmp sgt i32 %21, %22
  br i1 %23, label %24, label %26

24:                                               ; preds = %20
  %25 = load i32, ptr %5, align 4, !tbaa !5
  br label %28

26:                                               ; preds = %20
  %27 = load i32, ptr %6, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %26, %24
  %29 = phi i32 [ %25, %24 ], [ %27, %26 ]
  br label %30

30:                                               ; preds = %28, %18
  %31 = phi i32 [ %19, %18 ], [ %29, %28 ]
  ret i32 %31
}

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" }

!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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C/C++ TBAA"}


; 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 nofree norecurse nosync nounwind willreturn memory(none) uwtable
define dso_local noundef i32 @maxOfThreeNums(i32 noundef %0, i32 noundef %1, i32 noundef %2) local_unnamed_addr #0 {
  %. = tail call i32 @llvm.smax.i32(i32 %0, i32 %1)
  %4 = tail call i32 @llvm.smax.i32(i32 %., i32 %2)
  ret i32 %4
}

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

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(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)"}


; Effective O3 passes: GlobalOptPass,InstCombinePass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass