From: Richard Biener Date: Tue, 13 Jun 2023 06:52:23 +0000 (+0200) Subject: Fix disambiguation against .MASK_LOAD X-Git-Tag: basepoints/gcc-15~8361 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1c3661e224e3ddfc6f773b095740c0f5a7ddf5fc;p=thirdparty%2Fgcc.git Fix disambiguation against .MASK_LOAD 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. --- diff --git a/gcc/tree-ssa-alias.cc b/gcc/tree-ssa-alias.cc index b5476e8b41ee..e1bc04b82ba3 100644 --- a/gcc/tree-ssa-alias.cc +++ b/gcc/tree-ssa-alias.cc @@ -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