A lot of code that wants to know the number of bits in a vector
element gets that information from the element's TYPE_SIZE,
which is always equal to TYPE_SIZE_UNIT * BITS_PER_UNIT.
This doesn't work for SVE and AVX512-style packed boolean vectors,
where several elements can occupy a single byte.
This patch introduces a new pair of helpers for getting the true
(possibly sub-byte) size. I made a token attempt to convert obvious
element size calculations, but I'm sure I missed some.
Tested individually on aarch64-linux-gnu and as a series on
x86_64-linux-gnu. OK to install?
Richard
2020-05-11 Richard Sandiford <richard.sandif...@arm.com>
gcc/
PR tree-optimization/94980
* tree.h (vector_element_bits, vector_element_bits_tree): Declare.
* tree.c (vector_element_bits, vector_element_bits_tree): New.
* match.pd: Use the new functions instead of determining the
vector element size directly from TYPE_SIZE(_UNIT).
* tree-vect-data-refs.c (vect_gather_scatter_fn_p): Likewise.
* tree-vect-patterns.c (vect_recog_mask_conversion_pattern): Likewise.
* tree-vect-stmts.c (vect_is_simple_cond): Likewise.
* tree-vect-generic.c (expand_vector_piecewise): Likewise.
(expand_vector_conversion): Likewise.
(expand_vector_addition): Likewise for a TYPE_SIZE_UNIT used as
a divisor. Convert the dividend to bits to compensate.
* tree-vect-loop.c (vectorizable_live_operation): Call
vector_element_bits instead of open-coding it.
---
gcc/match.pd | 2 +-
gcc/tree-vect-data-refs.c | 2 +-
gcc/tree-vect-generic.c | 19 +++++++------------
gcc/tree-vect-loop.c | 4 +---
gcc/tree-vect-patterns.c | 3 +--
gcc/tree-vect-stmts.c | 3 +--
gcc/tree.c | 24 ++++++++++++++++++++++++
gcc/tree.h | 2 ++
8 files changed, 38 insertions(+), 21 deletions(-)
diff --git a/gcc/tree.h b/gcc/tree.h
index 4644d6616d9..11c109fffcd 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1996,6 +1996,8 @@ class auto_suppress_location_wrappers
extern machine_mode element_mode (const_tree);
extern machine_mode vector_type_mode (const_tree);
+extern unsigned int vector_element_bits (const_tree);
+extern tree vector_element_bits_tree (const_tree);
/* The "canonical" type for this type node, which is used by frontends to
compare the type for equality with another type. If two types are
diff --git a/gcc/tree.c b/gcc/tree.c
index 5b7d3fddbcb..1aabffeea43 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -13806,6 +13806,30 @@ vector_type_mode (const_tree t)
return mode;
}
+/* Return the size in bits of each element of vector type TYPE. */
+
+unsigned int
+vector_element_bits (const_tree type)
+{
+ gcc_checking_assert (VECTOR_TYPE_P (type));
+ if (VECTOR_BOOLEAN_TYPE_P (type))
+ return vector_element_size (tree_to_poly_uint64 (TYPE_SIZE (type)),
+ TYPE_VECTOR_SUBPARTS (type));
+ return tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)));
+}
+
+/* Calculate the size in bits of each element of vector type TYPE
+ and return the result as a tree of type bitsizetype. */
+
+tree
+vector_element_bits_tree (const_tree type)
+{
+ gcc_checking_assert (VECTOR_TYPE_P (type));
+ if (VECTOR_BOOLEAN_TYPE_P (type))
+ return bitsize_int (vector_element_bits (type));
+ return TYPE_SIZE (TREE_TYPE (type));
+}
+
/* Verify that basic properties of T match TV and thus T can be a variant of
TV. TV should be the more specified variant (i.e. the main variant). */
diff --git a/gcc/match.pd b/gcc/match.pd
index 58a4ac66414..33ee1a920bf 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -6306,7 +6306,7 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
}
(if (ins)
(bit_insert { op0; } { ins; }
- { bitsize_int (at * tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)))); })
+ { bitsize_int (at * vector_element_bits (type)); })
(if (changed)
(vec_perm { op0; } { op1; } { op2; }))))))))))
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
index d41ba49fabf..b950aa9e50d 100644
--- a/gcc/tree-vect-data-refs.c
+++ b/gcc/tree-vect-data-refs.c
@@ -3693,7 +3693,7 @@ vect_gather_scatter_fn_p (vec_info *vinfo, bool read_p,
bool masked_p,
tree *offset_vectype_out)
{
unsigned int memory_bits = tree_to_uhwi (TYPE_SIZE (memory_type));
- unsigned int element_bits = tree_to_uhwi (TYPE_SIZE (TREE_TYPE (vectype)));
+ unsigned int element_bits = vector_element_bits (vectype);
if (element_bits != memory_bits)
/* For now the vector elements must be the same width as the
memory elements. */
diff --git a/gcc/tree-vect-generic.c b/gcc/tree-vect-generic.c
index 8b00f325054..126e906e0a9 100644
--- a/gcc/tree-vect-generic.c
+++ b/gcc/tree-vect-generic.c
@@ -276,8 +276,7 @@ expand_vector_piecewise (gimple_stmt_iterator *gsi,
elem_op_func f,
tree part_width = TYPE_SIZE (inner_type);
tree index = bitsize_int (0);
int nunits = nunits_for_known_piecewise_op (type);
- int delta = tree_to_uhwi (part_width)
- / tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)));
+ int delta = tree_to_uhwi (part_width) / vector_element_bits (type);
int i;
location_t loc = gimple_location (gsi_stmt (*gsi));
@@ -357,8 +356,7 @@ expand_vector_addition (gimple_stmt_iterator *gsi,
elem_op_func f, elem_op_func f_parallel,
tree type, tree a, tree b, enum tree_code code)
{
- int parts_per_word = UNITS_PER_WORD
- / tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (type)));
+ int parts_per_word = BITS_PER_WORD / vector_element_bits (type);
if (INTEGRAL_TYPE_P (TREE_TYPE (type))
&& parts_per_word >= 4
@@ -1727,19 +1725,17 @@ expand_vector_conversion (gimple_stmt_iterator *gsi)
optab optab1 = unknown_optab;
gcc_checking_assert (VECTOR_TYPE_P (ret_type) && VECTOR_TYPE_P (arg_type));
- gcc_checking_assert (tree_fits_uhwi_p (TYPE_SIZE (TREE_TYPE (ret_type))));
- gcc_checking_assert (tree_fits_uhwi_p (TYPE_SIZE (TREE_TYPE (arg_type))));
if (INTEGRAL_TYPE_P (TREE_TYPE (ret_type))
&& SCALAR_FLOAT_TYPE_P (TREE_TYPE (arg_type)))
code = FIX_TRUNC_EXPR;
else if (INTEGRAL_TYPE_P (TREE_TYPE (arg_type))
&& SCALAR_FLOAT_TYPE_P (TREE_TYPE (ret_type)))
code = FLOAT_EXPR;
- if (tree_to_uhwi (TYPE_SIZE (TREE_TYPE (ret_type)))
- < tree_to_uhwi (TYPE_SIZE (TREE_TYPE (arg_type))))
+ unsigned int ret_elt_bits = vector_element_bits (ret_type);
+ unsigned int arg_elt_bits = vector_element_bits (arg_type);
+ if (ret_elt_bits < arg_elt_bits)
modifier = NARROW;
- else if (tree_to_uhwi (TYPE_SIZE (TREE_TYPE (ret_type)))
- > tree_to_uhwi (TYPE_SIZE (TREE_TYPE (arg_type))))
+ else if (ret_elt_bits > arg_elt_bits)
modifier = WIDEN;
if (modifier == NONE && (code == FIX_TRUNC_EXPR || code == FLOAT_EXPR))
@@ -1902,8 +1898,7 @@ expand_vector_conversion (gimple_stmt_iterator *gsi)
tree part_width = TYPE_SIZE (compute_type);
tree index = bitsize_int (0);
int nunits = nunits_for_known_piecewise_op (arg_type);
- int delta = tree_to_uhwi (part_width)
- / tree_to_uhwi (TYPE_SIZE (TREE_TYPE (arg_type)));
+ int delta = tree_to_uhwi (part_width) / arg_elt_bits;
int i;
location_t loc = gimple_location (gsi_stmt (*gsi));
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c
index 64463b874c7..180790abf42 100644
--- a/gcc/tree-vect-loop.c
+++ b/gcc/tree-vect-loop.c
@@ -8017,9 +8017,7 @@ vectorizable_live_operation (loop_vec_info loop_vinfo,
: gimple_get_lhs (stmt);
lhs_type = TREE_TYPE (lhs);
- bitsize = (VECTOR_BOOLEAN_TYPE_P (vectype)
- ? bitsize_int (TYPE_PRECISION (TREE_TYPE (vectype)))
- : TYPE_SIZE (TREE_TYPE (vectype)));
+ bitsize = vector_element_bits_tree (vectype);
vec_bitsize = TYPE_SIZE (vectype);
/* Get the vectorized lhs of STMT and the lane to use (counted in bits). */
diff --git a/gcc/tree-vect-patterns.c b/gcc/tree-vect-patterns.c
index 1f148a0e620..a1fd67341d7 100644
--- a/gcc/tree-vect-patterns.c
+++ b/gcc/tree-vect-patterns.c
@@ -4381,8 +4381,7 @@ vect_recog_mask_conversion_pattern (vec_info *vinfo,
|| dt == vect_constant_def))
{
tree wide_scalar_type = build_nonstandard_integer_type
- (tree_to_uhwi (TYPE_SIZE (TREE_TYPE (vectype1))),
- TYPE_UNSIGNED (rhs1_type));
+ (vector_element_bits (vectype1), TYPE_UNSIGNED (rhs1_type));
tree vectype3 = get_vectype_for_scalar_type (vinfo,
wide_scalar_type);
if (expand_vec_cond_expr_p (vectype1, vectype3, TREE_CODE (rhs1)))
diff --git a/gcc/tree-vect-stmts.c b/gcc/tree-vect-stmts.c
index f7f19fee1bb..9a715b82f1a 100644
--- a/gcc/tree-vect-stmts.c
+++ b/gcc/tree-vect-stmts.c
@@ -10041,8 +10041,7 @@ vect_is_simple_cond (tree cond, vec_info *vinfo,
slp_tree slp_node,
&& tree_int_cst_lt (TYPE_SIZE (scalar_type),
TYPE_SIZE (TREE_TYPE (vectype))))
scalar_type = build_nonstandard_integer_type
- (tree_to_uhwi (TYPE_SIZE (TREE_TYPE (vectype))),
- TYPE_UNSIGNED (scalar_type));
+ (vector_element_bits (vectype), TYPE_UNSIGNED (scalar_type));
*comp_vectype = get_vectype_for_scalar_type (vinfo, scalar_type,
slp_node);
}
