On 12/12/18 1:22 PM, Segher Boessenkool wrote:
> The new insn here (temporarily) illegally shares RTL. This fixes it.
>
> Tested with an ARC cross, and regstrapped on powerpc64-linux {-m32,-m64}.
> Is this okay for trunk?
>
>
> Segher
>
>
> 2018-12-12 Segher Boessenkool <seg...@kernel.crashing.org>
>
> PR rtl-optimization/88001
> * function.c (match_asm_constraints_1): Don't invalidly share RTL.
>
> ---
> gcc/function.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gcc/function.c b/gcc/function.c
> index 69523c1..60e96f3 100644
> --- a/gcc/function.c
> +++ b/gcc/function.c
> @@ -6529,7 +6529,7 @@ match_asm_constraints_1 (rtx_insn *insn, rtx *p_sets,
> int noutputs)
> output_matched[match] = true;
>
> start_sequence ();
> - emit_move_insn (output, input);
> + emit_move_insn (output, copy_rtx (input));
> insns = get_insns ();
> end_sequence ();
> emit_insn_before (insns, insn);
>
Presumably INPUT is already referenced by INSN, thus the potential
invalid sharing via the newly introduced move?
OK.
Jeff
