; LLVM IR from Dev-XYS/Algorithms :: Stack.ll (Z4pushi)

; 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"

@S = external dso_local global [100000 x i32], align 16
@M = external dso_local global [100000 x i32], align 16
@sp = external dso_local global i32, align 4

; Function Attrs: mustprogress nounwind uwtable
define dso_local void @_Z4pushi(i32 noundef %0) #0 {
  %2 = alloca i32, align 4
  store i32 %0, ptr %2, align 4, !tbaa !5
  %3 = load i32, ptr %2, align 4, !tbaa !5
  %4 = load i32, ptr @sp, align 4, !tbaa !5
  %5 = sext i32 %4 to i64
  %6 = getelementptr inbounds [100000 x i32], ptr @S, i64 0, i64 %5
  store i32 %3, ptr %6, align 4, !tbaa !5
  %7 = load i32, ptr %2, align 4, !tbaa !5
  %8 = load i32, ptr @sp, align 4, !tbaa !5
  %9 = sub nsw i32 %8, 1
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [100000 x i32], ptr @M, i64 0, i64 %10
  %12 = load i32, ptr %11, align 4, !tbaa !5
  %13 = icmp sgt i32 %7, %12
  br i1 %13, label %14, label %19

14:                                               ; preds = %1
  %15 = load i32, ptr %2, align 4, !tbaa !5
  %16 = load i32, ptr @sp, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [100000 x i32], ptr @M, i64 0, i64 %17
  store i32 %15, ptr %18, align 4, !tbaa !5
  br label %28

19:                                               ; preds = %1
  %20 = load i32, ptr @sp, align 4, !tbaa !5
  %21 = sub nsw i32 %20, 1
  %22 = sext i32 %21 to i64
  %23 = getelementptr inbounds [100000 x i32], ptr @M, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = load i32, ptr @sp, align 4, !tbaa !5
  %26 = sext i32 %25 to i64
  %27 = getelementptr inbounds [100000 x i32], ptr @M, i64 0, i64 %26
  store i32 %24, ptr %27, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %19, %14
  %29 = load i32, ptr @sp, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr @sp, align 4, !tbaa !5
  ret void
}

attributes #0 = { mustprogress 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++ 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"

@S = external dso_local local_unnamed_addr global [100000 x i32], align 16
@M = external dso_local local_unnamed_addr global [100000 x i32], align 16
@sp = external dso_local local_unnamed_addr global i32, align 4

; Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(readwrite, argmem: none, inaccessiblemem: none) uwtable
define dso_local void @_Z4pushi(i32 noundef %0) local_unnamed_addr #0 {
  %2 = load i32, ptr @sp, align 4, !tbaa !5
  %3 = sext i32 %2 to i64
  %4 = getelementptr inbounds [100000 x i32], ptr @S, i64 0, i64 %3
  store i32 %0, ptr %4, align 4, !tbaa !5
  %5 = add nsw i32 %2, -1
  %6 = sext i32 %5 to i64
  %7 = getelementptr inbounds [100000 x i32], ptr @M, i64 0, i64 %6
  %8 = load i32, ptr %7, align 4, !tbaa !5
  %spec.select = tail call i32 @llvm.smax.i32(i32 %8, i32 %0)
  %9 = getelementptr inbounds [100000 x i32], ptr @M, i64 0, i64 %3
  store i32 %spec.select, ptr %9, align 4
  %10 = add nsw i32 %2, 1
  store i32 %10, ptr @sp, align 4, !tbaa !5
  ret void
}

; 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(readwrite, argmem: none, 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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}


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