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From: Tejas Belagod <tejas.belagod@arm.com>
To: <gcc-patches@gcc.gnu.org>
CC: Richard Sandiford <richard.sandiford@arm.com>, <jakub@redhat.com>, "Tejas
Belagod" <tejas.belagod@arm.com>
Subject: [PATCH v4 1/3] gomp: Various fixes for SVE types [PR101018]
Date: Tue, 18 Mar 2025 11:27:06 +0530
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List-Id: <gcc-patches.gcc.gnu.org>
From: Richard Sandiford <richard.sandiford@arm.com>
Various parts of the omp code checked whether the size of a decl
was an INTEGER_CST in order to determine whether the decl was
variable-sized or not. If it was variable-sized, it was expected
to have a DECL_VALUE_EXPR replacement, as for VLAs.
This patch uses poly_int_tree_p instead, so that variable-length
SVE vectors are treated like constant-length vectors. This means
that some structures become poly_int-sized, with some fields at
poly_int offsets, but we already have code to handle that.
An alternative would have been to handle the data via indirection
instead. However, that's likely to be more complicated, and it
would contradict is_variable_sized, which already uses a check
for TREE_CONSTANT rather than INTEGER_CST.
gimple_add_tmp_var should probably not add a safelen of 1
for SVE vectors, but that's really a separate thing and might
be hard to test.
Co-authored-by: Tejas Belagod <tejas.belagod@arm.com>
gcc/
PR middle-end/101018
* poly-int.h (can_and_p): New function.
* fold-const.cc (poly_int_binop): Use it to optimize BIT_AND_EXPRs
involving POLY_INT_CSTs.
* gimplify.cc (omp_notice_variable): Use poly_int_tree_p instead
of INTEGER_CST when checking for constant-sized omp data.
(gimplify_adjust_omp_clauses_1): Likewise.
(gimplify_adjust_omp_clauses): Likewise.
* omp-low.cc (scan_sharing_clauses): Likewise.
---
gcc/fold-const.cc | 7 +++++++
gcc/gimplify.cc | 19 +++++++++----------
gcc/omp-low.cc | 2 +-
gcc/poly-int.h | 19 +++++++++++++++++++
4 files changed, 36 insertions(+), 11 deletions(-)
diff --git a/gcc/fold-const.cc b/gcc/fold-const.cc
index fef7a6cc48e..4687412f01f 100644
--- a/gcc/fold-const.cc
+++ b/gcc/fold-const.cc
@@ -1284,6 +1284,13 @@ poly_int_binop (poly_wide_int &res, enum tree_code code,
return false;
break;
+ case BIT_AND_EXPR:
+ if (TREE_CODE (arg2) != INTEGER_CST
+ || !can_and_p (wi::to_poly_wide (arg1), wi::to_wide (arg2),
+ &res))
+ return false;
+ break;
+
case BIT_IOR_EXPR:
if (TREE_CODE (arg2) != INTEGER_CST
|| !can_ior_p (wi::to_poly_wide (arg1), wi::to_wide (arg2),
diff --git a/gcc/gimplify.cc b/gcc/gimplify.cc
index 5bdd970f570..534c8457280 100644
--- a/gcc/gimplify.cc
+++ b/gcc/gimplify.cc
@@ -9125,7 +9125,8 @@ omp_notice_variable (struct gimplify_omp_ctx *ctx, tree decl, bool in_code)
&& (flags & (GOVD_SEEN | GOVD_LOCAL)) == GOVD_SEEN
&& DECL_SIZE (decl))
{
- if (TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
+ tree size;
+ if (!poly_int_tree_p (DECL_SIZE (decl)))
{
splay_tree_node n2;
tree t = DECL_VALUE_EXPR (decl);
@@ -9136,16 +9137,14 @@ omp_notice_variable (struct gimplify_omp_ctx *ctx, tree decl, bool in_code)
n2->value |= GOVD_SEEN;
}
else if (omp_privatize_by_reference (decl)
- && TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (decl)))
- && (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (decl))))
- != INTEGER_CST))
+ && (size = TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (decl))))
+ && !poly_int_tree_p (size))
{
splay_tree_node n2;
- tree t = TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (decl)));
- gcc_assert (DECL_P (t));
- n2 = splay_tree_lookup (ctx->variables, (splay_tree_key) t);
+ gcc_assert (DECL_P (size));
+ n2 = splay_tree_lookup (ctx->variables, (splay_tree_key) size);
if (n2)
- omp_notice_variable (ctx, t, true);
+ omp_notice_variable (ctx, size, true);
}
}
@@ -14402,7 +14401,7 @@ gimplify_adjust_omp_clauses_1 (splay_tree_node n, void *data)
if ((gimplify_omp_ctxp->region_type & ORT_ACC) == 0)
OMP_CLAUSE_MAP_RUNTIME_IMPLICIT_P (clause) = 1;
if (DECL_SIZE (decl)
- && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
+ && !poly_int_tree_p (DECL_SIZE (decl)))
{
tree decl2 = DECL_VALUE_EXPR (decl);
gcc_assert (INDIRECT_REF_P (decl2));
@@ -15143,7 +15142,7 @@ gimplify_adjust_omp_clauses (gimple_seq *pre_p, gimple_seq body, tree *list_p,
if (!DECL_P (decl))
break;
if (DECL_SIZE (decl)
- && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
+ && !poly_int_tree_p (DECL_SIZE (decl)))
{
tree decl2 = DECL_VALUE_EXPR (decl);
gcc_assert (INDIRECT_REF_P (decl2));
diff --git a/gcc/omp-low.cc b/gcc/omp-low.cc
index c36ae38cf8e..00bcf27fa47 100644
--- a/gcc/omp-low.cc
+++ b/gcc/omp-low.cc
@@ -1461,7 +1461,7 @@ scan_sharing_clauses (tree clauses, omp_context *ctx)
else
install_var_field (decl, false, 11, ctx);
if (DECL_SIZE (decl)
- && TREE_CODE (DECL_SIZE (decl)) != INTEGER_CST)
+ && !poly_int_tree_p (DECL_SIZE (decl)))
{
tree decl2 = DECL_VALUE_EXPR (decl);
gcc_assert (INDIRECT_REF_P (decl2));
diff --git a/gcc/poly-int.h b/gcc/poly-int.h
index 7c8901a971a..77f78752e74 100644
--- a/gcc/poly-int.h
+++ b/gcc/poly-int.h
@@ -1906,6 +1906,25 @@ known_alignment (const poly_int<N, Ca> &a)
return r & -r;
}
+/* Return true if we can compute A & B at compile time, storing the
+ result in RES if so. */
+
+template<unsigned int N, typename Ca, typename Cb, typename Cr>
+inline typename if_nonpoly<Cb, bool>::type
+can_and_p (const poly_int<N, Ca> &a, Cb b, Cr *result)
+{
+ /* Coefficients 1 and above must be a multiple of something greater
+ than ~B. */
+ typedef POLY_INT_TYPE (Ca) int_type;
+ if (N >= 2)
+ for (unsigned int i = 1; i < N; i++)
+ if ((-(a.coeffs[i] & -a.coeffs[i]) & ~b) != int_type (0))
+ return false;
+ *result = a;
+ result->coeffs[0] &= b;
+ return true;
+}
+
/* Return true if we can compute A | B at compile time, storing the
result in RES if so. */
--
2.25.1