; LLVM IR from achilles288/robot-monitor-graphics :: src/base/util/string.ll (ZNK3rmg6StringixEt)

; 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"

%"class.rmg::String" = type <{ ptr, i16, i16, [4 x i8] }>

; Function Attrs: mustprogress nounwind uwtable
define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNK3rmg6StringixEt(ptr noundef nonnull align 8 dereferenceable(12) %0, i16 noundef zeroext %1) #0 align 2 {
  %3 = alloca ptr, align 8
  %4 = alloca ptr, align 8
  %5 = alloca i16, align 2
  store ptr %0, ptr %4, align 8, !tbaa !5
  store i16 %1, ptr %5, align 2, !tbaa !9
  %6 = load ptr, ptr %4, align 8
  %7 = load i16, ptr %5, align 2, !tbaa !9
  %8 = zext i16 %7 to i32
  %9 = getelementptr inbounds %"class.rmg::String", ptr %6, i32 0, i32 1
  %10 = load i16, ptr %9, align 8, !tbaa !11
  %11 = zext i16 %10 to i32
  %12 = icmp sge i32 %8, %11
  br i1 %12, label %13, label %20

13:                                               ; preds = %2
  %14 = getelementptr inbounds %"class.rmg::String", ptr %6, i32 0, i32 0
  %15 = load ptr, ptr %14, align 8, !tbaa !13
  %16 = getelementptr inbounds %"class.rmg::String", ptr %6, i32 0, i32 1
  %17 = load i16, ptr %16, align 8, !tbaa !11
  %18 = zext i16 %17 to i64
  %19 = getelementptr inbounds i8, ptr %15, i64 %18
  store ptr %19, ptr %3, align 8
  br label %26

20:                                               ; preds = %2
  %21 = getelementptr inbounds %"class.rmg::String", ptr %6, i32 0, i32 0
  %22 = load ptr, ptr %21, align 8, !tbaa !13
  %23 = load i16, ptr %5, align 2, !tbaa !9
  %24 = zext i16 %23 to i64
  %25 = getelementptr inbounds i8, ptr %22, i64 %24
  store ptr %25, ptr %3, align 8
  br label %26

26:                                               ; preds = %20, %13
  %27 = load ptr, ptr %3, align 8
  ret ptr %27
}

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 = !{!"any pointer", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"short", !7, i64 0}
!11 = !{!12, !10, i64 8}
!12 = !{!"_ZTSN3rmg6StringE", !6, i64 0, !10, i64 8, !10, i64 10}
!13 = !{!12, !6, i64 0}


; 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(argmem: read) uwtable
define dso_local noundef nonnull align 1 dereferenceable(1) ptr @_ZNK3rmg6StringixEt(ptr nocapture noundef nonnull readonly align 8 dereferenceable(12) %0, i16 noundef zeroext %1) local_unnamed_addr #0 align 2 {
  %3 = getelementptr inbounds i8, ptr %0, i64 8
  %4 = load i16, ptr %3, align 8, !tbaa !5
  %5 = load ptr, ptr %0, align 8
  %.0.v.v = tail call i16 @llvm.umin.i16(i16 %4, i16 %1)
  %.0.v = zext i16 %.0.v.v to i64
  %.0 = getelementptr inbounds i8, ptr %5, i64 %.0.v
  ret ptr %.0
}

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i16 @llvm.umin.i16(i16, i16) #1

attributes #0 = { mustprogress nofree norecurse nosync nounwind willreturn memory(argmem: read) 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, !10, i64 8}
!6 = !{!"_ZTSN3rmg6StringE", !7, i64 0, !10, i64 8, !10, i64 10}
!7 = !{!"any pointer", !8, i64 0}
!8 = !{!"omnipotent char", !9, i64 0}
!9 = !{!"Simple C++ TBAA"}
!10 = !{!"short", !8, i64 0}


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