; LLVM IR from 6leetcode/6leetcode :: questions/Algorithms/0013. Roman to Integer (Testing)

; 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
declare dso_local i32 @roman_to_integer(i8 noundef signext) #0

; 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
  store i32 1, ptr %3, align 4, !tbaa !10
  br label %11

11:                                               ; preds = %49, %1
  %12 = load ptr, ptr %2, align 8, !tbaa !5
  %13 = load i32, ptr %3, align 4, !tbaa !10
  %14 = sext i32 %13 to i64
  %15 = getelementptr inbounds i8, ptr %12, i64 %14
  %16 = load i8, ptr %15, align 1, !tbaa !9
  %17 = sext i8 %16 to i32
  %18 = icmp ne i32 %17, 0
  br i1 %18, label %19, label %52

19:                                               ; preds = %11
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #2
  %20 = load ptr, ptr %2, align 8, !tbaa !5
  %21 = load i32, ptr %3, align 4, !tbaa !10
  %22 = sub nsw i32 %21, 1
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds i8, ptr %20, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !9
  %26 = call i32 @roman_to_integer(i8 noundef signext %25)
  store i32 %26, ptr %5, align 4, !tbaa !10
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #2
  %27 = load ptr, ptr %2, align 8, !tbaa !5
  %28 = load i32, ptr %3, align 4, !tbaa !10
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds i8, ptr %27, i64 %29
  %31 = load i8, ptr %30, align 1, !tbaa !9
  %32 = call i32 @roman_to_integer(i8 noundef signext %31)
  store i32 %32, ptr %6, align 4, !tbaa !10
  %33 = load i32, ptr %5, align 4, !tbaa !10
  %34 = load i32, ptr %6, align 4, !tbaa !10
  %35 = icmp slt i32 %33, %34
  br i1 %35, label %36, label %44

36:                                               ; preds = %19
  %37 = load i32, ptr %4, align 4, !tbaa !10
  %38 = load i32, ptr %5, align 4, !tbaa !10
  %39 = sub nsw i32 %37, %38
  %40 = load i32, ptr %6, align 4, !tbaa !10
  %41 = load i32, ptr %5, align 4, !tbaa !10
  %42 = sub nsw i32 %40, %41
  %43 = add nsw i32 %39, %42
  store i32 %43, ptr %4, align 4, !tbaa !10
  br label %48

44:                                               ; preds = %19
  %45 = load i32, ptr %6, align 4, !tbaa !10
  %46 = load i32, ptr %4, align 4, !tbaa !10
  %47 = add nsw i32 %46, %45
  store i32 %47, ptr %4, align 4, !tbaa !10
  br label %48

48:                                               ; preds = %44, %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #2
  br label %49

49:                                               ; preds = %48
  %50 = load i32, ptr %3, align 4, !tbaa !10
  %51 = add nsw i32 %50, 1
  store i32 %51, ptr %3, align 4, !tbaa !10
  br label %11, !llvm.loop !12

52:                                               ; preds = %11
  %53 = load i32, ptr %4, align 4, !tbaa !10
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #2
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #2
  ret i32 %53
}

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

; 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
  %.not20 = icmp eq i8 %5, 0
  br i1 %.not20, 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 ptr [ %15, %.lr.ph ], [ %4, %1 ]
  %.01621 = phi i32 [ %.1, %.lr.ph ], [ %3, %1 ]
  %7 = getelementptr i8, ptr %6, i64 -1
  %8 = load i8, ptr %7, align 1, !tbaa !5
  %9 = tail call i32 @roman_to_integer(i8 noundef signext %8)
  %10 = load i8, ptr %6, align 1, !tbaa !5
  %11 = tail call i32 @roman_to_integer(i8 noundef signext %10)
  %12 = icmp slt i32 %9, %11
  %13 = shl i32 %9, 1
  %14 = select i1 %12, i32 %13, i32 0
  %.1.v = sub i32 %.01621, %14
  %.1 = add i32 %.1.v, %11
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %15 = getelementptr inbounds i8, ptr %0, i64 %indvars.iv.next
  %16 = load i8, ptr %15, align 1, !tbaa !5
  %.not = icmp eq i8 %16, 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
}

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