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From: Richard Biener <rguenth@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r13-1775] Add alias disambiguation for vectorizer load/store IFNs Date: Thu, 21 Jul 2022 07:02:00 +0000 (GMT) [thread overview] Message-ID: <20220721070200.CE2C73856DF5@sourceware.org> (raw) https://gcc.gnu.org/g:6877993c4da49315151e9d912408480070144dd3 commit r13-1775-g6877993c4da49315151e9d912408480070144dd3 Author: Richard Biener <rguenther@suse.de> Date: Wed Jul 20 15:46:17 2022 +0200 Add alias disambiguation for vectorizer load/store IFNs The following adds support for MASK_STORE, MASK_LOAD and friends to call_may_clobber_ref_p and ref_maybe_used_by_call_p. Since they all use a special argument to specify TBAA they are not really suited for fnspec handling thus the manual support. * tree-ssa-alias.cc (ref_maybe_used_by_call_p_1): Special-case store internal functions and IFN_MASK_LOAD, IFN_LEN_LOAD and IFN_MASK_LOAD_LANES. (call_may_clobber_ref_p_1): Special-case IFN_MASK_STORE, IFN_LEN_STORE and IFN_MASK_STORE_LANES. Diff: --- gcc/tree-ssa-alias.cc | 49 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 47 insertions(+), 2 deletions(-) diff --git a/gcc/tree-ssa-alias.cc b/gcc/tree-ssa-alias.cc index 782266bdad8..390cd875074 100644 --- a/gcc/tree-ssa-alias.cc +++ b/gcc/tree-ssa-alias.cc @@ -47,6 +47,7 @@ along with GCC; see the file COPYING3. If not see #include "print-tree.h" #include "tree-ssa-alias-compare.h" #include "builtins.h" +#include "internal-fn.h" /* Broad overview of how alias analysis on gimple works: @@ -2793,8 +2794,38 @@ ref_maybe_used_by_call_p_1 (gcall *call, ao_ref *ref, bool tbaa_p) if (ref->volatile_p) return true; - callee = gimple_call_fndecl (call); + if (gimple_call_internal_p (call)) + switch (gimple_call_internal_fn (call)) + { + case IFN_MASK_STORE: + case IFN_SCATTER_STORE: + case IFN_MASK_SCATTER_STORE: + case IFN_LEN_STORE: + return false; + case IFN_MASK_STORE_LANES: + goto process_args; + case IFN_MASK_LOAD: + case IFN_LEN_LOAD: + case IFN_MASK_LOAD_LANES: + { + ao_ref rhs_ref; + tree lhs = gimple_call_lhs (call); + if (lhs) + { + ao_ref_init_from_ptr_and_size (&rhs_ref, + gimple_call_arg (call, 0), + TYPE_SIZE_UNIT (TREE_TYPE (lhs))); + rhs_ref.ref_alias_set = rhs_ref.base_alias_set + = tbaa_p ? get_deref_alias_set (TREE_TYPE + (gimple_call_arg (call, 1))) : 0; + return refs_may_alias_p_1 (ref, &rhs_ref, tbaa_p); + } + break; + } + default:; + } + callee = gimple_call_fndecl (call); if (callee != NULL_TREE) { struct cgraph_node *node = cgraph_node::get (callee); @@ -3005,7 +3036,7 @@ call_may_clobber_ref_p_1 (gcall *call, ao_ref *ref, bool tbaa_p) & (ECF_PURE|ECF_CONST|ECF_LOOPING_CONST_OR_PURE|ECF_NOVOPS)) return false; if (gimple_call_internal_p (call)) - switch (gimple_call_internal_fn (call)) + switch (auto fn = gimple_call_internal_fn (call)) { /* Treat these internal calls like ECF_PURE for aliasing, they don't write to any memory the program should care about. @@ -3018,6 +3049,20 @@ call_may_clobber_ref_p_1 (gcall *call, ao_ref *ref, bool tbaa_p) case IFN_UBSAN_PTR: case IFN_ASAN_CHECK: return false; + case IFN_MASK_STORE: + case IFN_LEN_STORE: + case IFN_MASK_STORE_LANES: + { + tree rhs = gimple_call_arg (call, + internal_fn_stored_value_index (fn)); + ao_ref lhs_ref; + ao_ref_init_from_ptr_and_size (&lhs_ref, gimple_call_arg (call, 0), + TYPE_SIZE_UNIT (TREE_TYPE (rhs))); + lhs_ref.ref_alias_set = lhs_ref.base_alias_set + = tbaa_p ? get_deref_alias_set + (TREE_TYPE (gimple_call_arg (call, 1))) : 0; + return refs_may_alias_p_1 (ref, &lhs_ref, tbaa_p); + } default: break; }
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