return IFN_LAST;
}
-/* Function vect_permute_load_chain.
-
- Given a chain of interleaved loads in DR_CHAIN of LENGTH that must be
- a power of 2 or equal to 3, generate extract_even/odd stmts to reorder
- the input data correctly. Return the final references for loads in
- RESULT_CHAIN.
-
- E.g., LENGTH is 4 and the scalar type is short, i.e., VF is 8.
- The input is 4 vectors each containing 8 elements. We assign a number to each
- element, the input sequence is:
-
- 1st vec: 0 1 2 3 4 5 6 7
- 2nd vec: 8 9 10 11 12 13 14 15
- 3rd vec: 16 17 18 19 20 21 22 23
- 4th vec: 24 25 26 27 28 29 30 31
-
- The output sequence should be:
-
- 1st vec: 0 4 8 12 16 20 24 28
- 2nd vec: 1 5 9 13 17 21 25 29
- 3rd vec: 2 6 10 14 18 22 26 30
- 4th vec: 3 7 11 15 19 23 27 31
-
- i.e., the first output vector should contain the first elements of each
- interleaving group, etc.
-
- We use extract_even/odd instructions to create such output. The input of
- each extract_even/odd operation is two vectors
- 1st vec 2nd vec
- 0 1 2 3 4 5 6 7
-
- and the output is the vector of extracted even/odd elements. The output of
- extract_even will be: 0 2 4 6
- and of extract_odd: 1 3 5 7
-
-
- The permutation is done in log LENGTH stages. In each stage extract_even
- and extract_odd stmts are created for each pair of vectors in DR_CHAIN in
- their order. In our example,
-
- E1: extract_even (1st vec, 2nd vec)
- E2: extract_odd (1st vec, 2nd vec)
- E3: extract_even (3rd vec, 4th vec)
- E4: extract_odd (3rd vec, 4th vec)
-
- The output for the first stage will be:
-
- E1: 0 2 4 6 8 10 12 14
- E2: 1 3 5 7 9 11 13 15
- E3: 16 18 20 22 24 26 28 30
- E4: 17 19 21 23 25 27 29 31
-
- In order to proceed and create the correct sequence for the next stage (or
- for the correct output, if the second stage is the last one, as in our
- example), we first put the output of extract_even operation and then the
- output of extract_odd in RESULT_CHAIN (which is then copied to DR_CHAIN).
- The input for the second stage is:
-
- 1st vec (E1): 0 2 4 6 8 10 12 14
- 2nd vec (E3): 16 18 20 22 24 26 28 30
- 3rd vec (E2): 1 3 5 7 9 11 13 15
- 4th vec (E4): 17 19 21 23 25 27 29 31
-
- The output of the second stage:
-
- E1: 0 4 8 12 16 20 24 28
- E2: 2 6 10 14 18 22 26 30
- E3: 1 5 9 13 17 21 25 29
- E4: 3 7 11 15 19 23 27 31
-
- And RESULT_CHAIN after reordering:
-
- 1st vec (E1): 0 4 8 12 16 20 24 28
- 2nd vec (E3): 1 5 9 13 17 21 25 29
- 3rd vec (E2): 2 6 10 14 18 22 26 30
- 4th vec (E4): 3 7 11 15 19 23 27 31. */
-
-static void
-vect_permute_load_chain (vec_info *vinfo, vec<tree> dr_chain,
- unsigned int length,
- stmt_vec_info stmt_info,
- gimple_stmt_iterator *gsi,
- vec<tree> *result_chain)
-{
- tree data_ref, first_vect, second_vect;
- tree perm_mask_even, perm_mask_odd;
- tree perm3_mask_low, perm3_mask_high;
- gimple *perm_stmt;
- tree vectype = STMT_VINFO_VECTYPE (stmt_info);
- unsigned int i, j, log_length = exact_log2 (length);
-
- result_chain->quick_grow (length);
- memcpy (result_chain->address (), dr_chain.address (),
- length * sizeof (tree));
-
- if (length == 3)
- {
- /* vect_grouped_load_supported ensures that this is constant. */
- unsigned nelt = TYPE_VECTOR_SUBPARTS (vectype).to_constant ();
- unsigned int k;
-
- vec_perm_builder sel (nelt, nelt, 1);
- sel.quick_grow (nelt);
- vec_perm_indices indices;
- for (k = 0; k < 3; k++)
- {
- for (i = 0; i < nelt; i++)
- if (3 * i + k < 2 * nelt)
- sel[i] = 3 * i + k;
- else
- sel[i] = 0;
- indices.new_vector (sel, 2, nelt);
- perm3_mask_low = vect_gen_perm_mask_checked (vectype, indices);
-
- for (i = 0, j = 0; i < nelt; i++)
- if (3 * i + k < 2 * nelt)
- sel[i] = i;
- else
- sel[i] = nelt + ((nelt + k) % 3) + 3 * (j++);
- indices.new_vector (sel, 2, nelt);
- perm3_mask_high = vect_gen_perm_mask_checked (vectype, indices);
-
- first_vect = dr_chain[0];
- second_vect = dr_chain[1];
-
- /* Create interleaving stmt (low part of):
- low = VEC_PERM_EXPR <first_vect, second_vect2, {k, 3 + k, 6 + k,
- ...}> */
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shuffle3_low");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR, first_vect,
- second_vect, perm3_mask_low);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
-
- /* Create interleaving stmt (high part of):
- high = VEC_PERM_EXPR <first_vect, second_vect2, {k, 3 + k, 6 + k,
- ...}> */
- first_vect = data_ref;
- second_vect = dr_chain[2];
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shuffle3_high");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR, first_vect,
- second_vect, perm3_mask_high);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- (*result_chain)[k] = data_ref;
- }
- }
- else
- {
- /* If length is not equal to 3 then only power of 2 is supported. */
- gcc_assert (pow2p_hwi (length));
-
- /* The encoding has a single stepped pattern. */
- poly_uint64 nelt = TYPE_VECTOR_SUBPARTS (vectype);
- vec_perm_builder sel (nelt, 1, 3);
- sel.quick_grow (3);
- for (i = 0; i < 3; ++i)
- sel[i] = i * 2;
- vec_perm_indices indices (sel, 2, nelt);
- perm_mask_even = vect_gen_perm_mask_checked (vectype, indices);
-
- for (i = 0; i < 3; ++i)
- sel[i] = i * 2 + 1;
- indices.new_vector (sel, 2, nelt);
- perm_mask_odd = vect_gen_perm_mask_checked (vectype, indices);
-
- for (i = 0; i < log_length; i++)
- {
- for (j = 0; j < length; j += 2)
- {
- first_vect = dr_chain[j];
- second_vect = dr_chain[j+1];
-
- /* data_ref = permute_even (first_data_ref, second_data_ref); */
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_perm_even");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- first_vect, second_vect,
- perm_mask_even);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- (*result_chain)[j/2] = data_ref;
-
- /* data_ref = permute_odd (first_data_ref, second_data_ref); */
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_perm_odd");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- first_vect, second_vect,
- perm_mask_odd);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- (*result_chain)[j/2+length/2] = data_ref;
- }
- memcpy (dr_chain.address (), result_chain->address (),
- length * sizeof (tree));
- }
- }
-}
-
-/* Function vect_shift_permute_load_chain.
-
- Given a chain of loads in DR_CHAIN of LENGTH 2 or 3, generate
- sequence of stmts to reorder the input data accordingly.
- Return the final references for loads in RESULT_CHAIN.
- Return true if successed, false otherwise.
-
- E.g., LENGTH is 3 and the scalar type is short, i.e., VF is 8.
- The input is 3 vectors each containing 8 elements. We assign a
- number to each element, the input sequence is:
-
- 1st vec: 0 1 2 3 4 5 6 7
- 2nd vec: 8 9 10 11 12 13 14 15
- 3rd vec: 16 17 18 19 20 21 22 23
-
- The output sequence should be:
-
- 1st vec: 0 3 6 9 12 15 18 21
- 2nd vec: 1 4 7 10 13 16 19 22
- 3rd vec: 2 5 8 11 14 17 20 23
-
- We use 3 shuffle instructions and 3 * 3 - 1 shifts to create such output.
-
- First we shuffle all 3 vectors to get correct elements order:
-
- 1st vec: ( 0 3 6) ( 1 4 7) ( 2 5)
- 2nd vec: ( 8 11 14) ( 9 12 15) (10 13)
- 3rd vec: (16 19 22) (17 20 23) (18 21)
-
- Next we unite and shift vector 3 times:
-
- 1st step:
- shift right by 6 the concatenation of:
- "1st vec" and "2nd vec"
- ( 0 3 6) ( 1 4 7) |( 2 5) _ ( 8 11 14) ( 9 12 15)| (10 13)
- "2nd vec" and "3rd vec"
- ( 8 11 14) ( 9 12 15) |(10 13) _ (16 19 22) (17 20 23)| (18 21)
- "3rd vec" and "1st vec"
- (16 19 22) (17 20 23) |(18 21) _ ( 0 3 6) ( 1 4 7)| ( 2 5)
- | New vectors |
-
- So that now new vectors are:
-
- 1st vec: ( 2 5) ( 8 11 14) ( 9 12 15)
- 2nd vec: (10 13) (16 19 22) (17 20 23)
- 3rd vec: (18 21) ( 0 3 6) ( 1 4 7)
-
- 2nd step:
- shift right by 5 the concatenation of:
- "1st vec" and "3rd vec"
- ( 2 5) ( 8 11 14) |( 9 12 15) _ (18 21) ( 0 3 6)| ( 1 4 7)
- "2nd vec" and "1st vec"
- (10 13) (16 19 22) |(17 20 23) _ ( 2 5) ( 8 11 14)| ( 9 12 15)
- "3rd vec" and "2nd vec"
- (18 21) ( 0 3 6) |( 1 4 7) _ (10 13) (16 19 22)| (17 20 23)
- | New vectors |
-
- So that now new vectors are:
-
- 1st vec: ( 9 12 15) (18 21) ( 0 3 6)
- 2nd vec: (17 20 23) ( 2 5) ( 8 11 14)
- 3rd vec: ( 1 4 7) (10 13) (16 19 22) READY
-
- 3rd step:
- shift right by 5 the concatenation of:
- "1st vec" and "1st vec"
- ( 9 12 15) (18 21) |( 0 3 6) _ ( 9 12 15) (18 21)| ( 0 3 6)
- shift right by 3 the concatenation of:
- "2nd vec" and "2nd vec"
- (17 20 23) |( 2 5) ( 8 11 14) _ (17 20 23)| ( 2 5) ( 8 11 14)
- | New vectors |
-
- So that now all vectors are READY:
- 1st vec: ( 0 3 6) ( 9 12 15) (18 21)
- 2nd vec: ( 2 5) ( 8 11 14) (17 20 23)
- 3rd vec: ( 1 4 7) (10 13) (16 19 22)
-
- This algorithm is faster than one in vect_permute_load_chain if:
- 1. "shift of a concatination" is faster than general permutation.
- This is usually so.
- 2. The TARGET machine can't execute vector instructions in parallel.
- This is because each step of the algorithm depends on previous.
- The algorithm in vect_permute_load_chain is much more parallel.
-
- The algorithm is applicable only for LOAD CHAIN LENGTH less than VF.
-*/
-
-static bool
-vect_shift_permute_load_chain (vec_info *vinfo, vec<tree> dr_chain,
- unsigned int length,
- stmt_vec_info stmt_info,
- gimple_stmt_iterator *gsi,
- vec<tree> *result_chain)
-{
- tree vect[3], vect_shift[3], data_ref, first_vect, second_vect;
- tree perm2_mask1, perm2_mask2, perm3_mask;
- tree select_mask, shift1_mask, shift2_mask, shift3_mask, shift4_mask;
- gimple *perm_stmt;
-
- tree vectype = STMT_VINFO_VECTYPE (stmt_info);
- machine_mode vmode = TYPE_MODE (vectype);
- unsigned int i;
- loop_vec_info loop_vinfo = dyn_cast <loop_vec_info> (vinfo);
-
- unsigned HOST_WIDE_INT nelt, vf;
- if (!TYPE_VECTOR_SUBPARTS (vectype).is_constant (&nelt)
- || !LOOP_VINFO_VECT_FACTOR (loop_vinfo).is_constant (&vf))
- /* Not supported for variable-length vectors. */
- return false;
-
- vec_perm_builder sel (nelt, nelt, 1);
- sel.quick_grow (nelt);
-
- result_chain->quick_grow (length);
- memcpy (result_chain->address (), dr_chain.address (),
- length * sizeof (tree));
-
- if (pow2p_hwi (length) && vf > 4)
- {
- unsigned int j, log_length = exact_log2 (length);
- for (i = 0; i < nelt / 2; ++i)
- sel[i] = i * 2;
- for (i = 0; i < nelt / 2; ++i)
- sel[nelt / 2 + i] = i * 2 + 1;
- vec_perm_indices indices (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shuffle of 2 fields structure is not \
- supported by target\n");
- return false;
- }
- perm2_mask1 = vect_gen_perm_mask_checked (vectype, indices);
-
- for (i = 0; i < nelt / 2; ++i)
- sel[i] = i * 2 + 1;
- for (i = 0; i < nelt / 2; ++i)
- sel[nelt / 2 + i] = i * 2;
- indices.new_vector (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shuffle of 2 fields structure is not \
- supported by target\n");
- return false;
- }
- perm2_mask2 = vect_gen_perm_mask_checked (vectype, indices);
-
- /* Generating permutation constant to shift all elements.
- For vector length 8 it is {4 5 6 7 8 9 10 11}. */
- for (i = 0; i < nelt; i++)
- sel[i] = nelt / 2 + i;
- indices.new_vector (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shift permutation is not supported by target\n");
- return false;
- }
- shift1_mask = vect_gen_perm_mask_checked (vectype, indices);
-
- /* Generating permutation constant to select vector from 2.
- For vector length 8 it is {0 1 2 3 12 13 14 15}. */
- for (i = 0; i < nelt / 2; i++)
- sel[i] = i;
- for (i = nelt / 2; i < nelt; i++)
- sel[i] = nelt + i;
- indices.new_vector (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "select is not supported by target\n");
- return false;
- }
- select_mask = vect_gen_perm_mask_checked (vectype, indices);
-
- for (i = 0; i < log_length; i++)
- {
- for (j = 0; j < length; j += 2)
- {
- first_vect = dr_chain[j];
- second_vect = dr_chain[j + 1];
-
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shuffle2");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- first_vect, first_vect,
- perm2_mask1);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- vect[0] = data_ref;
-
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shuffle2");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- second_vect, second_vect,
- perm2_mask2);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- vect[1] = data_ref;
-
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shift");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- vect[0], vect[1], shift1_mask);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- (*result_chain)[j/2 + length/2] = data_ref;
-
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_select");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- vect[0], vect[1], select_mask);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- (*result_chain)[j/2] = data_ref;
- }
- memcpy (dr_chain.address (), result_chain->address (),
- length * sizeof (tree));
- }
- return true;
- }
- if (length == 3 && vf > 2)
- {
- unsigned int k = 0, l = 0;
-
- /* Generating permutation constant to get all elements in rigth order.
- For vector length 8 it is {0 3 6 1 4 7 2 5}. */
- for (i = 0; i < nelt; i++)
- {
- if (3 * k + (l % 3) >= nelt)
- {
- k = 0;
- l += (3 - (nelt % 3));
- }
- sel[i] = 3 * k + (l % 3);
- k++;
- }
- vec_perm_indices indices (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shuffle of 3 fields structure is not \
- supported by target\n");
- return false;
- }
- perm3_mask = vect_gen_perm_mask_checked (vectype, indices);
-
- /* Generating permutation constant to shift all elements.
- For vector length 8 it is {6 7 8 9 10 11 12 13}. */
- for (i = 0; i < nelt; i++)
- sel[i] = 2 * (nelt / 3) + (nelt % 3) + i;
- indices.new_vector (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shift permutation is not supported by target\n");
- return false;
- }
- shift1_mask = vect_gen_perm_mask_checked (vectype, indices);
-
- /* Generating permutation constant to shift all elements.
- For vector length 8 it is {5 6 7 8 9 10 11 12}. */
- for (i = 0; i < nelt; i++)
- sel[i] = 2 * (nelt / 3) + 1 + i;
- indices.new_vector (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shift permutation is not supported by target\n");
- return false;
- }
- shift2_mask = vect_gen_perm_mask_checked (vectype, indices);
-
- /* Generating permutation constant to shift all elements.
- For vector length 8 it is {3 4 5 6 7 8 9 10}. */
- for (i = 0; i < nelt; i++)
- sel[i] = (nelt / 3) + (nelt % 3) / 2 + i;
- indices.new_vector (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shift permutation is not supported by target\n");
- return false;
- }
- shift3_mask = vect_gen_perm_mask_checked (vectype, indices);
-
- /* Generating permutation constant to shift all elements.
- For vector length 8 it is {5 6 7 8 9 10 11 12}. */
- for (i = 0; i < nelt; i++)
- sel[i] = 2 * (nelt / 3) + (nelt % 3) / 2 + i;
- indices.new_vector (sel, 2, nelt);
- if (!can_vec_perm_const_p (vmode, vmode, indices))
- {
- if (dump_enabled_p ())
- dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
- "shift permutation is not supported by target\n");
- return false;
- }
- shift4_mask = vect_gen_perm_mask_checked (vectype, indices);
-
- for (k = 0; k < 3; k++)
- {
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shuffle3");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- dr_chain[k], dr_chain[k],
- perm3_mask);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- vect[k] = data_ref;
- }
-
- for (k = 0; k < 3; k++)
- {
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shift1");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- vect[k % 3], vect[(k + 1) % 3],
- shift1_mask);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- vect_shift[k] = data_ref;
- }
-
- for (k = 0; k < 3; k++)
- {
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shift2");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR,
- vect_shift[(4 - k) % 3],
- vect_shift[(3 - k) % 3],
- shift2_mask);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- vect[k] = data_ref;
- }
-
- (*result_chain)[3 - (nelt % 3)] = vect[2];
-
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shift3");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR, vect[0],
- vect[0], shift3_mask);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- (*result_chain)[nelt % 3] = data_ref;
-
- data_ref = make_temp_ssa_name (vectype, NULL, "vect_shift4");
- perm_stmt = gimple_build_assign (data_ref, VEC_PERM_EXPR, vect[1],
- vect[1], shift4_mask);
- vect_finish_stmt_generation (vinfo, stmt_info, perm_stmt, gsi);
- (*result_chain)[0] = data_ref;
- return true;
- }
- return false;
-}
-
-/* Function vect_transform_grouped_load.
-
- Given a chain of input interleaved data-refs (in DR_CHAIN), build statements
- to perform their permutation and ascribe the result vectorized statements to
- the scalar statements.
-*/
-
-void
-vect_transform_grouped_load (vec_info *vinfo, stmt_vec_info stmt_info,
- vec<tree> dr_chain,
- int size, gimple_stmt_iterator *gsi)
-{
- machine_mode mode;
- vec<tree> result_chain = vNULL;
-
- /* DR_CHAIN contains input data-refs that are a part of the interleaving.
- RESULT_CHAIN is the output of vect_permute_load_chain, it contains permuted
- vectors, that are ready for vector computation. */
- result_chain.create (size);
-
- /* If reassociation width for vector type is 2 or greater target machine can
- execute 2 or more vector instructions in parallel. Otherwise try to
- get chain for loads group using vect_shift_permute_load_chain. */
- mode = TYPE_MODE (STMT_VINFO_VECTYPE (stmt_info));
- if (targetm.sched.reassociation_width (VEC_PERM_EXPR, mode) > 1
- || pow2p_hwi (size)
- || !vect_shift_permute_load_chain (vinfo, dr_chain, size, stmt_info,
- gsi, &result_chain))
- vect_permute_load_chain (vinfo, dr_chain,
- size, stmt_info, gsi, &result_chain);
- vect_record_grouped_load_vectors (vinfo, stmt_info, result_chain);
- result_chain.release ();
-}
-
-/* RESULT_CHAIN contains the output of a group of grouped loads that were
- generated as part of the vectorization of STMT_INFO. Assign the statement
- for each vector to the associated scalar statement. */
-
-void
-vect_record_grouped_load_vectors (vec_info *, stmt_vec_info stmt_info,
- vec<tree> result_chain)
-{
- stmt_vec_info first_stmt_info = DR_GROUP_FIRST_ELEMENT (stmt_info);
- unsigned int i, gap_count;
- tree tmp_data_ref;
-
- /* Put a permuted data-ref in the VECTORIZED_STMT field.
- Since we scan the chain starting from it's first node, their order
- corresponds the order of data-refs in RESULT_CHAIN. */
- stmt_vec_info next_stmt_info = first_stmt_info;
- gap_count = 1;
- FOR_EACH_VEC_ELT (result_chain, i, tmp_data_ref)
- {
- if (!next_stmt_info)
- break;
-
- /* Skip the gaps. Loads created for the gaps will be removed by dead
- code elimination pass later. No need to check for the first stmt in
- the group, since it always exists.
- DR_GROUP_GAP is the number of steps in elements from the previous
- access (if there is no gap DR_GROUP_GAP is 1). We skip loads that
- correspond to the gaps. */
- if (next_stmt_info != first_stmt_info
- && gap_count < DR_GROUP_GAP (next_stmt_info))
- {
- gap_count++;
- continue;
- }
-
- /* ??? The following needs cleanup after the removal of
- DR_GROUP_SAME_DR_STMT. */
- if (next_stmt_info)
- {
- gimple *new_stmt = SSA_NAME_DEF_STMT (tmp_data_ref);
- /* We assume that if VEC_STMT is not NULL, this is a case of multiple
- copies, and we put the new vector statement last. */
- STMT_VINFO_VEC_STMTS (next_stmt_info).safe_push (new_stmt);
-
- next_stmt_info = DR_GROUP_NEXT_ELEMENT (next_stmt_info);
- gap_count = 1;
- }
- }
-}
-
/* Function vect_force_dr_alignment_p.
Returns whether the alignment of a DECL can be forced to be aligned
projects / thirdparty / gcc.git / commitdiff
