Alex Coplan <alex.cop...@arm.com> writes:
> This is needed by the upcoming aarch64 load pair pass, as it can
> re-order stores (when alias analysis determines this is safe) and thus
> change which mem def a given use consumes (in the RTL-SSA view, there is
> no alias disambiguation of memory).
>
> Bootstrapped/regtested as a series on aarch64-linux-gnu, OK for trunk?
>
> gcc/ChangeLog:
>
> * rtl-ssa/accesses.cc (function_info::reparent_use): New.
> * rtl-ssa/functions.h (function_info): Declare new member
> function reparent_use.
OK, thanks.
Richard
> ---
> gcc/rtl-ssa/accesses.cc | 8 ++++++++
> gcc/rtl-ssa/functions.h | 3 +++
> 2 files changed, 11 insertions(+)
>
> diff --git a/gcc/rtl-ssa/accesses.cc b/gcc/rtl-ssa/accesses.cc
> index f12b5f4dd77..774ab9d99ee 100644
> --- a/gcc/rtl-ssa/accesses.cc
> +++ b/gcc/rtl-ssa/accesses.cc
> @@ -1239,6 +1239,14 @@ function_info::add_use (use_info *use)
> insert_use_before (use, neighbor->value ());
> }
>
> +void
> +function_info::reparent_use (use_info *use, set_info *new_def)
> +{
> + remove_use (use);
> + use->set_def (new_def);
> + add_use (use);
> +}
> +
> // If USE has a known definition, remove USE from that definition's list
> // of uses. Also remove if it from the associated splay tree, if any.
> void
> diff --git a/gcc/rtl-ssa/functions.h b/gcc/rtl-ssa/functions.h
> index 8b53b264064..d7da9774213 100644
> --- a/gcc/rtl-ssa/functions.h
> +++ b/gcc/rtl-ssa/functions.h
> @@ -159,6 +159,9 @@ public:
> // Like change_insns, but for a single change CHANGE.
> void change_insn (insn_change &change);
>
> + // Given a use USE, re-parent it to get its def from NEW_DEF.
> + void reparent_use (use_info *use, set_info *new_def);
> +
> // If the changes that have been made to instructions require updates
> // to the CFG, perform those updates now. Return true if something
> changed.
> // If it did:
