https://gcc.gnu.org/g:3da5038ed58578d3373d5d5e371d6a15b172b201
commit r16-3043-g3da5038ed58578d3373d5d5e371d6a15b172b201
Author: Richard Biener <rguent...@suse.de>
Date: Wed Aug 6 09:41:26 2025 +0200
Use proper alias type for gather/scatter with SLP
Both vectorizable_load and vectorizable_store compute an alias
type commoning differences between SLP lanes. The following
makes sure to use that for gather/scatter rather than the
random one from the representative created during scalar stmt
gather/scatter analysis.
* tree-vect-stmts.cc (vectorizable_store): Build proper
alias + align pointer value for gather/scatter and SLP
and use it.
(vectorizable_load): Likewise.
Diff:
---
gcc/tree-vect-stmts.cc | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index f3af31015612..3bf2deca8eaa 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -8530,7 +8530,6 @@ vectorizable_store (vec_info *vinfo,
gcc_assert (useless_type_conversion_p (vectype,
TREE_TYPE (vec_oprnd)));
}
- unsigned HOST_WIDE_INT align;
tree final_mask = NULL_TREE;
tree final_len = NULL_TREE;
tree bias = NULL_TREE;
@@ -8545,6 +8544,8 @@ vectorizable_store (vec_info *vinfo,
final_mask, vec_mask, gsi);
}
+ unsigned align = get_object_alignment (DR_REF (first_dr_info->dr));
+ tree alias_align_ptr = build_int_cst (ref_type, align);
if (GATHER_SCATTER_IFN_P (gs_info))
{
if (costing_p)
@@ -8586,7 +8587,7 @@ vectorizable_store (vec_info *vinfo,
if (VECTOR_TYPE_P (TREE_TYPE (vec_offset)))
call = gimple_build_call_internal (
IFN_MASK_LEN_SCATTER_STORE, 8, dataref_ptr,
- gs_info.alias_ptr,
+ alias_align_ptr,
vec_offset, scale, vec_oprnd, final_mask, final_len,
bias);
else
@@ -8603,12 +8604,12 @@ vectorizable_store (vec_info *vinfo,
else if (final_mask)
call = gimple_build_call_internal
(IFN_MASK_SCATTER_STORE, 6, dataref_ptr,
- gs_info.alias_ptr,
+ alias_align_ptr,
vec_offset, scale, vec_oprnd, final_mask);
else
call = gimple_build_call_internal (IFN_SCATTER_STORE, 5,
dataref_ptr,
- gs_info.alias_ptr,
+ alias_align_ptr,
vec_offset,
scale, vec_oprnd);
gimple_call_set_nothrow (call, true);
@@ -8764,7 +8765,6 @@ vectorizable_store (vec_info *vinfo,
= (j % factor) * const_nunits;
tree idx_type = TREE_TYPE (TREE_TYPE (vec_offset));
tree scale = size_int (gs_info.scale);
- align = get_object_alignment (DR_REF (first_dr_info->dr));
tree ltype = build_aligned_type (TREE_TYPE (vectype), align);
for (unsigned k = 0; k < const_nunits; ++k)
{
@@ -10393,7 +10393,8 @@ vectorizable_load (vec_info *vinfo,
}
/* 2. Create the vector-load in the loop. */
- unsigned HOST_WIDE_INT align;
+ unsigned align = get_object_alignment (DR_REF (first_dr_info->dr));
+ tree alias_align_ptr = build_int_cst (ref_type, align);
if (GATHER_SCATTER_IFN_P (gs_info))
{
if (costing_p)
@@ -10441,7 +10442,7 @@ vectorizable_load (vec_info *vinfo,
if (VECTOR_TYPE_P (TREE_TYPE (vec_offset)))
call = gimple_build_call_internal (IFN_MASK_LEN_GATHER_LOAD,
9, dataref_ptr,
- gs_info.alias_ptr,
+ alias_align_ptr,
vec_offset, scale, zero,
final_mask, vec_els,
final_len, bias);
@@ -10457,13 +10458,13 @@ vectorizable_load (vec_info *vinfo,
else if (final_mask)
call = gimple_build_call_internal (IFN_MASK_GATHER_LOAD,
7, dataref_ptr,
- gs_info.alias_ptr,
+ alias_align_ptr,
vec_offset, scale,
zero, final_mask, vec_els);
else
call = gimple_build_call_internal (IFN_GATHER_LOAD, 5,
dataref_ptr,
- gs_info.alias_ptr,
+ alias_align_ptr,
vec_offset, scale, zero);
gimple_call_set_nothrow (call, true);
new_stmt = call;
@@ -10621,7 +10622,6 @@ vectorizable_load (vec_info *vinfo,
unsigned elt_offset = (i % factor) * const_nunits;
tree idx_type = TREE_TYPE (TREE_TYPE (vec_offset));
tree scale = size_int (gs_info.scale);
- align = get_object_alignment (DR_REF (first_dr_info->dr));
tree ltype = build_aligned_type (TREE_TYPE (vectype), align);
for (unsigned k = 0; k < const_nunits; ++k)
{
