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Fix disambiguation against .MASK_LOAD

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Alias analysis was treating .MASK_LOAD as storing a full vector
which means we disambiguate against decls of smaller than vector size.
This complements the previous patch handling .MASK_STORE and fixes
runtime execution FAILs of gfortran.dg/matmul_3.f90 and
gfortran.dg/inline_sum_2.f90 when using AVX512 with full masked loop
vectorization on Zen4.

	* tree-ssa-alias.cc (ref_maybe_used_by_call_p_1): For
	.MASK_LOAD and friends set the size of the access to unknown.
This commit is contained in:
Richard Biener 2023-06-13 08:52:23 +02:00
parent 17714c08e9
commit 1c3661e224
1 changed files with 4 additions and 1 deletions
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5
gcc/tree-ssa-alias.cc
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@ -2829,6 +2829,9 @@ ref_maybe_used_by_call_p_1 (gcall *call, ao_ref *ref, bool tbaa_p)
ao_ref_init_from_ptr_and_size (&rhs_ref,
gimple_call_arg (call, 0),
TYPE_SIZE_UNIT (TREE_TYPE (lhs)));
/* We cannot make this a known-size access since otherwise
we disambiguate against refs to decls that are smaller. */
rhs_ref.size = -1;
rhs_ref.ref_alias_set = rhs_ref.base_alias_set
= tbaa_p ? get_deref_alias_set (TREE_TYPE
(gimple_call_arg (call, 1))) : 0;
@ -3073,7 +3076,7 @@ call_may_clobber_ref_p_1 (gcall *call, ao_ref *ref, bool tbaa_p)
ao_ref_init_from_ptr_and_size (&lhs_ref, gimple_call_arg (call, 0),
TYPE_SIZE_UNIT (TREE_TYPE (rhs)));
/* We cannot make this a known-size access since otherwise
we disambiguate against stores to decls that are smaller. */
we disambiguate against refs to decls that are smaller. */
lhs_ref.size = -1;
lhs_ref.ref_alias_set = lhs_ref.base_alias_set
= tbaa_p ? get_deref_alias_set