[PATCH] libgccjit: Handle truncation and extension for casts [PR 95498]
Antoni Boucher
bouanto@zoho.com
Sat Feb 13 01:35:04 GMT 2021
Hi.
I'd like to know what's the status of the review for this patch.
(Same for my other patch 96889: add some reflection functions in the jit
C api)
Thanks.
On Tue, Jul 21, 2020 at 11:29:57PM +0200, Andrea Corallo wrote:
>Hi Antoni,
>
>a couple of nits and some thoughts.
>
>Antoni Boucher via Gcc-patches <gcc-patches@gcc.gnu.org> writes:
>
>> 2020-07-12 Antoni Boucher <bouanto@zoho.com>
>>
>> gcc/jit/
>> PR target/95498
>> * jit-playback.c: Add support to handle truncation and extension
> ^^^
> here we usually add the function that gets
>modified, you can look at other changelog entries as example.
>
>> diff --git a/gcc/jit/jit-playback.c b/gcc/jit/jit-playback.c
>> index 0fddf04da87..4f4a1080c36 100644
>> --- a/gcc/jit/jit-playback.c
>> +++ b/gcc/jit/jit-playback.c
>> @@ -61,22 +61,39 @@ along with GCC; see the file COPYING3. If not see
>>
>> /* gcc::jit::playback::context::build_cast uses the convert.h API,
>> which in turn requires the frontend to provide a "convert"
>> - function, apparently as a fallback.
>> -
>> - Hence we provide this dummy one, with the requirement that any casts
>> - are handled before reaching this. */
>> + function, apparently as a fallback for casts that can be simplified
>> + (truncation, extension). */
>> extern tree convert (tree type, tree expr);
>>
>> tree
>> convert (tree dst_type, tree expr)
>> {
>> - gcc_assert (gcc::jit::active_playback_ctxt);
>> - gcc::jit::active_playback_ctxt->add_error (NULL, "unhandled conversion");
>> - fprintf (stderr, "input expression:\n");
>> - debug_tree (expr);
>> - fprintf (stderr, "requested type:\n");
>> - debug_tree (dst_type);
>> - return error_mark_node;
>> + tree t_ret = NULL;
>> + t_ret = targetm.convert_to_type (dst_type, expr);
>> + if (t_ret)
>> + return t_ret;
> ^^^
> indent nit
>> + enum tree_code dst_code = TREE_CODE (dst_type);
>> + switch (dst_code)
>> + {
>> + case INTEGER_TYPE:
>> + case ENUMERAL_TYPE:
>> + t_ret = convert_to_integer (dst_type, expr);
>> + goto maybe_fold;
>> +
>> + default:
>> + gcc_assert (gcc::jit::active_playback_ctxt);
>> + gcc::jit::active_playback_ctxt->add_error (NULL, "unhandled conversion");
>> + fprintf (stderr, "input expression:\n");
>> + debug_tree (expr);
>> + fprintf (stderr, "requested type:\n");
>> + debug_tree (dst_type);
>> + return error_mark_node;
>> +
>> + maybe_fold:
>> + if (TREE_CODE (t_ret) != C_MAYBE_CONST_EXPR)
>> + t_ret = fold (t_ret);
>> + return t_ret;
>> + }
>> }
>
>Looking at 'convert' at c-convert.c:66 the INTEGER_TYPE case here looks
>good, but given the set of casts we accept as input I guess we should
>handle also POINTER_TYPE, BOOLEAN_TYPE and REAL_TYPE. What do you think
>about?
>
>Hope it helps
>
>Bests
>
> Andrea
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