On Fri, 19 Jan 2024, Jakub Jelinek wrote:
> Hi!
>
> sccvn uses GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type)) for INTEGER_TYPEs,
> most likely because that is what native_{interpret,encode}_int used.
> This obviously doesn't work for larger BITINT_TYPEs which have BLKmode
> and the above ICEs on those. native_{interpret,encode}_int checks whether
> the BITINT_TYPE is medium/large/huge (i.e. an array of 2+ ABI limbs)
> and uses TYPE_SIZE_UNIT for that case, otherwise SCALAR_INT_TYPE_MODE like
> for the INTEGER_TYPE case.
>
> The following patch instead just uses SCALAR_INT_TYPE_MODE for non-BLKmode
> TYPE_MODE and TYPE_SIZE_UNIT otherwise.
>
> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
OK.
Thanks,
Richard.
> 2024-01-19 Jakub Jelinek
>
> PR tree-optimization/113459
> * tree-ssa-sccvn.cc (vn_walk_cb_data::push_partial_def): Use
> TREE_INT_CST_LOW of TYPE_SIZE_UNIT rather than GET_MODE_SIZE
> of SCALAR_INT_TYPE_MODE if type has BLKmode.
> (vn_reference_lookup_3): Likewise. Formatting fix.
>
> * gcc.dg/bitint-73.c: New test.
>
> --- gcc/tree-ssa-sccvn.cc.jj 2024-01-03 11:51:42.361580881 +0100
> +++ gcc/tree-ssa-sccvn.cc 2024-01-18 12:39:52.789606975 +0100
> @@ -2287,7 +2287,12 @@ vn_walk_cb_data::push_partial_def (pd_da
> BITS_PER_UNIT
> - (maxsizei % BITS_PER_UNIT));
>if (INTEGRAL_TYPE_P (type))
> - sz = GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type));
> + {
> + if (TYPE_MODE (type) != BLKmode)
> + sz = GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type));
> + else
> + sz = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (type));
> + }
>if (sz > needed_len)
> {
> memcpy (this_buffer + (sz - needed_len), buffer, needed_len);
> @@ -2967,8 +2972,10 @@ vn_reference_lookup_3 (ao_ref *ref, tree
> }
> else
> {
> - unsigned buflen = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (vr->type)) +
> 1;
> - if (INTEGRAL_TYPE_P (vr->type))
> + unsigned buflen
> + = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (vr->type)) + 1;
> + if (INTEGRAL_TYPE_P (vr->type)
> + && TYPE_MODE (vr->type) != BLKmode)
> buflen = GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (vr->type)) + 1;
> unsigned char *buf = XALLOCAVEC (unsigned char, buflen);
> memset (buf, TREE_INT_CST_LOW (gimple_call_arg (def_stmt, 1)),
> @@ -3165,7 +3172,12 @@ vn_reference_lookup_3 (ao_ref *ref, tree
>offset + maxsize - 1. */
> HOST_WIDE_INT sz = maxsizei / BITS_PER_UNIT;
> if (INTEGRAL_TYPE_P (type))
> - sz = GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type));
> + {
> + if (TYPE_MODE (type) != BLKmode)
> + sz = GET_MODE_SIZE (SCALAR_INT_TYPE_MODE (type));
> + else
> + sz = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (type));
> + }
> amnt = ((unsigned HOST_WIDE_INT) offset2i + size2i
> - offseti - maxsizei) % BITS_PER_UNIT;
> if (amnt)
> --- gcc/testsuite/gcc.dg/bitint-73.c.jj 2024-01-18 12:29:07.586634031
> +0100
> +++ gcc/testsuite/gcc.dg/bitint-73.c 2024-01-18 12:28:42.406986342 +0100
> @@ -0,0 +1,18 @@
> +/* PR tree-optimization/113459 */
> +/* { dg-do compile { target bitint } } */
> +/* { dg-options "-std=c23 -O2" } */
> +
> +#if __BITINT_MAXWIDTH__ >= 129
> +# define N 129
> +#else
> +# define N 63
> +#endif
> +
> +_BitInt(N) a;
> +
> +_BitInt(N)
> +foo (void)
> +{
> + __builtin_memset (, 6, sizeof a);
> + return a;
> +}
>
> Jakub
>
>
--
Richard Biener
SUSE Software Solutions Germany GmbH,
Frankenstrasse 146, 90461 Nuernberg, Germany;
GF: Ivo Totev, Andrew McDonald, Werner Knoblich; (HRB 36809, AG Nuernberg)
