; LLVM IR from bqi343/cp-notebook :: Contests/Other Solutions/VT HSPC/2017/Criss-Cross.ll (ZdvSt4pairIS_IxxExEx)

; 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"

%"struct.std::pair.0" = type { %"struct.std::pair", i64 }
%"struct.std::pair" = type { i64, i64 }

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8simplifySt4pairIS_IxxExE(ptr dead_on_unwind noalias writable sret(%"struct.std::pair.0") align 8, ptr noundef byval(%"struct.std::pair.0") align 8) #0

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #1

; Function Attrs: mustprogress uwtable
define dso_local void @_ZdvSt4pairIS_IxxExEx(ptr dead_on_unwind noalias writable sret(%"struct.std::pair.0") align 8 %0, ptr noundef byval(%"struct.std::pair.0") align 8 %1, i64 noundef %2) #0 {
  %4 = alloca i64, align 8
  %5 = alloca %"struct.std::pair.0", align 8
  store i64 %2, ptr %4, align 8, !tbaa !5
  %6 = load i64, ptr %4, align 8, !tbaa !5
  %7 = getelementptr inbounds %"struct.std::pair.0", ptr %1, i32 0, i32 1
  %8 = load i64, ptr %7, align 8, !tbaa !9
  %9 = mul nsw i64 %8, %6
  store i64 %9, ptr %7, align 8, !tbaa !9
  call void @llvm.memcpy.p0.p0.i64(ptr align 8 %5, ptr align 8 %1, i64 24, i1 false)
  call void @_Z8simplifySt4pairIS_IxxExE(ptr dead_on_unwind writable sret(%"struct.std::pair.0") align 8 %0, ptr noundef byval(%"struct.std::pair.0") align 8 %5)
  ret void
}

attributes #0 = { mustprogress 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 nounwind willreturn memory(argmem: readwrite) }

!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 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !6, i64 16}
!10 = !{!"_ZTSSt4pairIS_IxxExE", !11, i64 0, !6, i64 16}
!11 = !{!"_ZTSSt4pairIxxE", !6, i64 0, !6, i64 8}


; 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"

%"struct.std::pair.0" = type { %"struct.std::pair", i64 }
%"struct.std::pair" = type { i64, i64 }

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z8simplifySt4pairIS_IxxExE(ptr dead_on_unwind noalias writable sret(%"struct.std::pair.0") align 8, ptr noundef byval(%"struct.std::pair.0") align 8) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
define dso_local void @_ZdvSt4pairIS_IxxExEx(ptr dead_on_unwind noalias writable sret(%"struct.std::pair.0") align 8 %0, ptr nocapture noundef byval(%"struct.std::pair.0") align 8 %1, i64 noundef %2) local_unnamed_addr #0 {
  %4 = getelementptr inbounds i8, ptr %1, i64 16
  %5 = load i64, ptr %4, align 8, !tbaa !5
  %6 = mul nsw i64 %5, %2
  store i64 %6, ptr %4, align 8, !tbaa !5
  tail call void @_Z8simplifySt4pairIS_IxxExE(ptr dead_on_unwind writable sret(%"struct.std::pair.0") align 8 %0, ptr noundef nonnull byval(%"struct.std::pair.0") align 8 %1)
  ret void
}

attributes #0 = { mustprogress 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, !8, i64 16}
!6 = !{!"_ZTSSt4pairIS_IxxExE", !7, i64 0, !8, i64 16}
!7 = !{!"_ZTSSt4pairIxxE", !8, i64 0, !8, i64 8}
!8 = !{!"long long", !9, i64 0}
!9 = !{!"omnipotent char", !10, i64 0}
!10 = !{!"Simple C++ TBAA"}


; Effective O3 passes: DSEPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,MemCpyOptPass,PostOrderFunctionAttrsPass,SROAPass,TailCallElimPass