; LLVM IR from begeekmyfriend/leetcode :: 0013_roman_to_integer (roman_to_integer)

; 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 @romanToInt(ptr noundef %0) #0 {
  %2 = alloca ptr, align 8
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  store ptr %0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #2
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #2
  %7 = load ptr, ptr %2, align 8, !tbaa !5
  %8 = getelementptr inbounds i8, ptr %7, i64 0
  %9 = load i8, ptr %8, align 1, !tbaa !9
  %10 = call i32 @roman_to_integer(i8 noundef signext %9)
  store i32 %10, ptr %4, align 4, !tbaa !10
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %11 = load i32, ptr %4, align 4, !tbaa !10
  store i32 %11, ptr %5, align 4, !tbaa !10
  store i32 1, ptr %3, align 4, !tbaa !10
  br label %12

12:                                               ; preds = %44, %1
  %13 = load ptr, ptr %2, align 8, !tbaa !5
  %14 = load i32, ptr %3, align 4, !tbaa !10
  %15 = sext i32 %14 to i64
  %16 = getelementptr inbounds i8, ptr %13, i64 %15
  %17 = load i8, ptr %16, align 1, !tbaa !9
  %18 = sext i8 %17 to i32
  %19 = icmp ne i32 %18, 0
  br i1 %19, label %20, label %47

20:                                               ; preds = %12
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %21 = load i32, ptr %4, align 4, !tbaa !10
  store i32 %21, ptr %6, align 4, !tbaa !10
  %22 = load ptr, ptr %2, align 8, !tbaa !5
  %23 = load i32, ptr %3, align 4, !tbaa !10
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i8, ptr %22, i64 %24
  %26 = load i8, ptr %25, align 1, !tbaa !9
  %27 = call i32 @roman_to_integer(i8 noundef signext %26)
  store i32 %27, ptr %4, align 4, !tbaa !10
  %28 = load i32, ptr %6, align 4, !tbaa !10
  %29 = load i32, ptr %4, align 4, !tbaa !10
  %30 = icmp slt i32 %28, %29
  br i1 %30, label %31, label %39

31:                                               ; preds = %20
  %32 = load i32, ptr %6, align 4, !tbaa !10
  %33 = load i32, ptr %4, align 4, !tbaa !10
  %34 = load i32, ptr %6, align 4, !tbaa !10
  %35 = sub nsw i32 %33, %34
  %36 = sub nsw i32 %32, %35
  %37 = load i32, ptr %5, align 4, !tbaa !10
  %38 = sub nsw i32 %37, %36
  store i32 %38, ptr %5, align 4, !tbaa !10
  br label %43

39:                                               ; preds = %20
  %40 = load i32, ptr %4, align 4, !tbaa !10
  %41 = load i32, ptr %5, align 4, !tbaa !10
  %42 = add nsw i32 %41, %40
  store i32 %42, ptr %5, align 4, !tbaa !10
  br label %43

43:                                               ; preds = %39, %31
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  br label %44

44:                                               ; preds = %43
  %45 = load i32, ptr %3, align 4, !tbaa !10
  %46 = add nsw i32 %45, 1
  store i32 %46, ptr %3, align 4, !tbaa !10
  br label %12, !llvm.loop !12

47:                                               ; preds = %12
  %48 = load i32, ptr %5, align 4, !tbaa !10
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %48
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nounwind uwtable
declare hidden i32 @roman_to_integer(i8 noundef signext) #0

; 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: nounwind uwtable
define dso_local i32 @romanToInt(ptr nocapture noundef readonly %0) local_unnamed_addr #0 {
  %2 = load i8, ptr %0, align 1, !tbaa !5
  %3 = tail call i32 @roman_to_integer(i8 noundef signext %2)
  %4 = getelementptr inbounds i8, ptr %0, i64 1
  %5 = load i8, ptr %4, align 1, !tbaa !5
  %.not21 = icmp eq i8 %5, 0
  br i1 %.not21, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %1, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 1, %1 ]
  %6 = phi i8 [ %10, %.lr.ph ], [ %5, %1 ]
  %.01623 = phi i32 [ %.1, %.lr.ph ], [ %3, %1 ]
  %.01722 = phi i32 [ %7, %.lr.ph ], [ %3, %1 ]
  %7 = tail call i32 @roman_to_integer(i8 noundef signext %6)
  %8 = icmp slt i32 %.01722, %7
  %.neg = mul i32 %.01722, -2
  %.neg20.neg25 = select i1 %8, i32 %.neg, i32 0
  %.1.p = add i32 %7, %.01623
  %.1 = add i32 %.1.p, %.neg20.neg25
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %9 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  %10 = load i8, ptr %9, align 1, !tbaa !5
  %.not = icmp eq i8 %10, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph, %1
  %.016.lcssa = phi i32 [ %3, %1 ], [ %.1, %.lr.ph ]
  ret i32 %.016.lcssa
}

; Function Attrs: nounwind uwtable
declare hidden i32 @roman_to_integer(i8 noundef signext) local_unnamed_addr #0

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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C/C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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