Bootstrap && Regression on X86 passed. Ok for trunk ? juzhe.zhong@rivai.ai From: juzhe.zhong Date: 2023-05-25 10:58 To: gcc-patches CC: richard.sandiford; rguenther; Ju-Zhe Zhong Subject: [PATCH V15] VECT: Add decrement IV iteration loop control by variable amount support From: Ju-Zhe Zhong This patch is supporting decrement IV by following the flow designed by Richard: (1) In vect_set_loop_condition_partial_vectors, for the first iteration of: call vect_set_loop_controls_directly. (2) vect_set_loop_controls_directly calculates "step" as in your patch. If rgc has 1 control, this step is the SSA name created for that control. Otherwise the step is a fresh SSA name, as in your patch. (3) vect_set_loop_controls_directly stores this step somewhere for later use, probably in LOOP_VINFO. Let's use "S" to refer to this stored step. (4) After the vect_set_loop_controls_directly call above, and outside the "if" statement that now contains vect_set_loop_controls_directly, check whether rgc->controls.length () > 1. If so, use vect_adjust_loop_lens_control to set the controls based on S. Then the only caller of vect_adjust_loop_lens_control is vect_set_loop_condition_partial_vectors. And the starting step for vect_adjust_loop_lens_control is always S. This patch has well tested for single-rgroup and multiple-rgroup (SLP) and passed all testcase in RISC-V port. Also, pass tests for multiple-rgroup (non-SLP) tested on vec_pack_trunk. Fix bugs of V14 patch: FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test FAIL: gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c execution test This patch passed all testcases listed above. gcc/ChangeLog: * tree-vect-loop-manip.cc (vect_set_loop_controls_directly): Add decrement IV support. (vect_adjust_loop_lens_control): Ditto. (vect_set_loop_condition_partial_vectors): Ditto. * tree-vect-loop.cc (_loop_vec_info::_loop_vec_info): New variables. * tree-vectorizer.h (LOOP_VINFO_USING_DECREMENTING_IV_P): New macro. (LOOP_VINFO_DECREMENTING_IV_STEP): Ditto. gcc/testsuite/ChangeLog: * gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-3.c: New test. * gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-4.c: New test. * gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c: New test. * gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-4.c: New test. --- .../rvv/autovec/partial/multiple_rgroup-3.c | 288 ++++++++++++++++++ .../rvv/autovec/partial/multiple_rgroup-4.c | 75 +++++ .../autovec/partial/multiple_rgroup_run-3.c | 36 +++ .../autovec/partial/multiple_rgroup_run-4.c | 15 + gcc/tree-vect-loop-manip.cc | 153 ++++++++++ gcc/tree-vect-loop.cc | 13 + gcc/tree-vectorizer.h | 12 + 7 files changed, 592 insertions(+) create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-3.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-4.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c create mode 100644 gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-4.c diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-3.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-3.c new file mode 100644 index 00000000000..9579749c285 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-3.c @@ -0,0 +1,288 @@ +/* { dg-do compile } */ +/* { dg-additional-options "-march=rv32gcv -mabi=ilp32d --param riscv-autovec-preference=fixed-vlmax" } */ + +#include + +void __attribute__ ((noinline, noclone)) +f0 (int8_t *__restrict x, int16_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 4, j += 8) + { + x[i + 0] += 1; + x[i + 1] += 2; + x[i + 2] += 3; + x[i + 3] += 4; + y[j + 0] += 1; + y[j + 1] += 2; + y[j + 2] += 3; + y[j + 3] += 4; + y[j + 4] += 5; + y[j + 5] += 6; + y[j + 6] += 7; + y[j + 7] += 8; + } +} + +void __attribute__ ((optimize (0))) +f0_init (int8_t *__restrict x, int8_t *__restrict x2, int16_t *__restrict y, + int16_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 4, j += 8) + { + x[i + 0] = i % 120; + x[i + 1] = i % 78; + x[i + 2] = i % 55; + x[i + 3] = i % 27; + y[j + 0] = j % 33; + y[j + 1] = j % 44; + y[j + 2] = j % 66; + y[j + 3] = j % 88; + y[j + 4] = j % 99; + y[j + 5] = j % 39; + y[j + 6] = j % 49; + y[j + 7] = j % 101; + + x2[i + 0] = i % 120; + x2[i + 1] = i % 78; + x2[i + 2] = i % 55; + x2[i + 3] = i % 27; + y2[j + 0] = j % 33; + y2[j + 1] = j % 44; + y2[j + 2] = j % 66; + y2[j + 3] = j % 88; + y2[j + 4] = j % 99; + y2[j + 5] = j % 39; + y2[j + 6] = j % 49; + y2[j + 7] = j % 101; + } +} + +void __attribute__ ((optimize (0))) +f0_golden (int8_t *__restrict x, int16_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 4, j += 8) + { + x[i + 0] += 1; + x[i + 1] += 2; + x[i + 2] += 3; + x[i + 3] += 4; + y[j + 0] += 1; + y[j + 1] += 2; + y[j + 2] += 3; + y[j + 3] += 4; + y[j + 4] += 5; + y[j + 5] += 6; + y[j + 6] += 7; + y[j + 7] += 8; + } +} + +void __attribute__ ((optimize (0))) +f0_check (int8_t *__restrict x, int8_t *__restrict x2, int16_t *__restrict y, + int16_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 4, j += 8) + { + if (x[i + 0] != x2[i + 0]) + __builtin_abort (); + if (x[i + 1] != x2[i + 1]) + __builtin_abort (); + if (x[i + 2] != x2[i + 2]) + __builtin_abort (); + if (x[i + 3] != x2[i + 3]) + __builtin_abort (); + if (y[j + 0] != y2[j + 0]) + __builtin_abort (); + if (y[j + 1] != y2[j + 1]) + __builtin_abort (); + if (y[j + 2] != y2[j + 2]) + __builtin_abort (); + if (y[j + 3] != y2[j + 3]) + __builtin_abort (); + if (y[j + 4] != y2[j + 4]) + __builtin_abort (); + if (y[j + 5] != y2[j + 5]) + __builtin_abort (); + if (y[j + 6] != y2[j + 6]) + __builtin_abort (); + if (y[j + 7] != y2[j + 7]) + __builtin_abort (); + } +} + +void __attribute__ ((noinline, noclone)) +f1 (int16_t *__restrict x, int32_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + x[i + 0] += 1; + x[i + 1] += 2; + y[j + 0] += 1; + y[j + 1] += 2; + y[j + 2] += 3; + y[j + 3] += 4; + } +} + +void __attribute__ ((optimize (0))) +f1_init (int16_t *__restrict x, int16_t *__restrict x2, int32_t *__restrict y, + int32_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + x[i + 0] = i % 67; + x[i + 1] = i % 76; + y[j + 0] = j % 111; + y[j + 1] = j % 63; + y[j + 2] = j % 39; + y[j + 3] = j % 8; + + x2[i + 0] = i % 67; + x2[i + 1] = i % 76; + y2[j + 0] = j % 111; + y2[j + 1] = j % 63; + y2[j + 2] = j % 39; + y2[j + 3] = j % 8; + } +} + +void __attribute__ ((optimize (0))) +f1_golden (int16_t *__restrict x, int32_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + x[i + 0] += 1; + x[i + 1] += 2; + y[j + 0] += 1; + y[j + 1] += 2; + y[j + 2] += 3; + y[j + 3] += 4; + } +} + +void __attribute__ ((optimize (0))) +f1_check (int16_t *__restrict x, int16_t *__restrict x2, int32_t *__restrict y, + int32_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + if (x[i + 0] != x2[i + 0]) + __builtin_abort (); + if (x[i + 1] != x2[i + 1]) + __builtin_abort (); + if (y[j + 0] != y2[j + 0]) + __builtin_abort (); + if (y[j + 1] != y2[j + 1]) + __builtin_abort (); + if (y[j + 2] != y2[j + 2]) + __builtin_abort (); + if (y[j + 3] != y2[j + 3]) + __builtin_abort (); + } +} + +void __attribute__ ((noinline, noclone)) +f2 (int32_t *__restrict x, int64_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + x[i + 0] += 1; + y[j + 0] += 1; + y[j + 1] += 2; + } +} + +void __attribute__ ((optimize (0))) +f2_init (int32_t *__restrict x, int32_t *__restrict x2, int64_t *__restrict y, + int64_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + x[i + 0] = i % 79; + y[j + 0] = j % 83; + y[j + 1] = j % 100; + + x2[i + 0] = i % 79; + y2[j + 0] = j % 83; + y2[j + 1] = j % 100; + } +} + +void __attribute__ ((optimize (0))) +f2_golden (int32_t *__restrict x, int64_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + x[i + 0] += 1; + y[j + 0] += 1; + y[j + 1] += 2; + } +} + +void __attribute__ ((noinline, noclone)) +f2_check (int32_t *__restrict x, int32_t *__restrict x2, int64_t *__restrict y, + int64_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + if (x[i + 0] != x2[i + 0]) + __builtin_abort (); + if (y[j + 0] != y2[j + 0]) + __builtin_abort (); + if (y[j + 1] != y2[j + 1]) + __builtin_abort (); + } +} + +void __attribute__ ((noinline, noclone)) +f3 (int8_t *__restrict x, int64_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + x[i + 0] += 1; + y[j + 0] += 1; + y[j + 1] += 2; + } +} + +void __attribute__ ((noinline, noclone)) +f3_init (int8_t *__restrict x, int8_t *__restrict x2, int64_t *__restrict y, + int64_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + x[i + 0] = i % 22; + y[j + 0] = i % 12; + y[j + 1] = i % 21; + + x2[i + 0] = i % 22; + y2[j + 0] = i % 12; + y2[j + 1] = i % 21; + } +} + +void __attribute__ ((optimize (0))) +f3_golden (int8_t *__restrict x, int64_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + x[i + 0] += 1; + y[j + 0] += 1; + y[j + 1] += 2; + } +} + +void __attribute__ ((noinline, noclone)) +f3_check (int8_t *__restrict x, int8_t *__restrict x2, int64_t *__restrict y, + int64_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 1, j += 2) + { + if (x[i + 0] != x2[i + 0]) + __builtin_abort (); + if (y[j + 0] != y2[j + 0]) + __builtin_abort (); + if (y[j + 1] != y2[j + 1]) + __builtin_abort (); + } +} diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-4.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-4.c new file mode 100644 index 00000000000..e87961e49ac --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup-4.c @@ -0,0 +1,75 @@ +/* { dg-do compile } */ +/* { dg-additional-options "-march=rv32gcv -mabi=ilp32d --param riscv-autovec-preference=fixed-vlmax" } */ + +#include + +void __attribute__ ((noinline, noclone)) +f (uint64_t *__restrict x, uint16_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + x[i + 0] += 1; + x[i + 1] += 2; + y[j + 0] += 1; + y[j + 1] += 2; + y[j + 2] += 3; + y[j + 3] += 4; + } +} + +void __attribute__ ((optimize (0))) +f_init (uint64_t *__restrict x, uint64_t *__restrict x2, uint16_t *__restrict y, + uint16_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + x[i + 0] = i * 897 + 189; + x[i + 1] = i * 79 + 55963; + y[j + 0] = j * 18 + 78642; + y[j + 1] = j * 9 + 8634; + y[j + 2] = j * 78 + 2588; + y[j + 3] = j * 38 + 8932; + + x2[i + 0] = i * 897 + 189; + x2[i + 1] = i * 79 + 55963; + y2[j + 0] = j * 18 + 78642; + y2[j + 1] = j * 9 + 8634; + y2[j + 2] = j * 78 + 2588; + y2[j + 3] = j * 38 + 8932; + } +} + +void __attribute__ ((optimize (0))) +f_golden (uint64_t *__restrict x, uint16_t *__restrict y, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + x[i + 0] += 1; + x[i + 1] += 2; + y[j + 0] += 1; + y[j + 1] += 2; + y[j + 2] += 3; + y[j + 3] += 4; + } +} + +void __attribute__ ((optimize (0))) +f_check (uint64_t *__restrict x, uint64_t *__restrict x2, + uint16_t *__restrict y, uint16_t *__restrict y2, int n) +{ + for (int i = 0, j = 0; i < n; i += 2, j += 4) + { + if (x[i + 0] != x2[i + 0]) + __builtin_abort (); + if (x[i + 1] != x2[i + 1]) + __builtin_abort (); + if (y[j + 0] != y2[j + 0]) + __builtin_abort (); + if (y[j + 1] != y2[j + 1]) + __builtin_abort (); + if (y[j + 2] != y2[j + 2]) + __builtin_abort (); + if (y[j + 3] != y2[j + 3]) + __builtin_abort (); + } +} diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c new file mode 100644 index 00000000000..b786738ce99 --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-3.c @@ -0,0 +1,36 @@ +/* { dg-do run { target { riscv_vector } } } */ +/* { dg-additional-options "--param riscv-autovec-preference=fixed-vlmax" } */ + +#include "multiple_rgroup-3.c" + +int __attribute__ ((optimize (0))) main (void) +{ + int8_t f0_x[3108], f0_x2[3108]; + int16_t f0_y[6216], f0_y2[6216]; + f0_init (f0_x, f0_x2, f0_y, f0_y2, 3108); + f0 (f0_x, f0_y, 3108); + f0_golden (f0_x2, f0_y2, 3108); + f0_check (f0_x, f0_x2, f0_y, f0_y2, 3108); + + int16_t f1_x[1998], f1_x2[1998]; + int32_t f1_y[3996], f1_y2[3996]; + f1_init (f1_x, f1_x2, f1_y, f1_y2, 1998); + f1 (f1_x, f1_y, 1998); + f1_golden (f1_x2, f1_y2, 1998); + f1_check (f1_x, f1_x2, f1_y, f1_y2, 1998); + + int32_t f2_x[2023], f2_x2[2023]; + int64_t f2_y[4046], f2_y2[4046]; + f2_init (f2_x, f2_x2, f2_y, f2_y2, 2023); + f2 (f2_x, f2_y, 2023); + f2_golden (f2_x2, f2_y2, 2023); + f2_check (f2_x, f2_x2, f2_y, f2_y2, 2023); + + int8_t f3_x[3203], f3_x2[3203]; + int64_t f3_y[6406], f3_y2[6406]; + f3_init (f3_x, f3_x2, f3_y, f3_y2, 3203); + f3 (f3_x, f3_y, 3203); + f3_golden (f3_x2, f3_y2, 3203); + f3_check (f3_x, f3_x2, f3_y, f3_y2, 3203); + return 0; +} diff --git a/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-4.c b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-4.c new file mode 100644 index 00000000000..7751384183e --- /dev/null +++ b/gcc/testsuite/gcc.target/riscv/rvv/autovec/partial/multiple_rgroup_run-4.c @@ -0,0 +1,15 @@ +/* { dg-do run { target { riscv_vector } } } */ +/* { dg-additional-options "--param riscv-autovec-preference=fixed-vlmax" } */ + +#include "multiple_rgroup-4.c" + +int __attribute__ ((optimize (0))) main (void) +{ + uint64_t f_x[3108], f_x2[3108]; + uint16_t f_y[6216], f_y2[6216]; + f_init (f_x, f_x2, f_y, f_y2, 3108); + f (f_x, f_y, 3108); + f_golden (f_x2, f_y2, 3108); + f_check (f_x, f_x2, f_y, f_y2, 3108); + return 0; +} diff --git a/gcc/tree-vect-loop-manip.cc b/gcc/tree-vect-loop-manip.cc index ff6159e08d5..f9d92ced982 100644 --- a/gcc/tree-vect-loop-manip.cc +++ b/gcc/tree-vect-loop-manip.cc @@ -468,6 +468,38 @@ vect_set_loop_controls_directly (class loop *loop, loop_vec_info loop_vinfo, gimple_stmt_iterator incr_gsi; bool insert_after; standard_iv_increment_position (loop, &incr_gsi, &insert_after); + if (LOOP_VINFO_USING_DECREMENTING_IV_P (loop_vinfo)) + { + /* single rgroup: + ... + _10 = (unsigned long) count_12(D); + ... + # ivtmp_9 = PHI + _36 = MIN_EXPR ; + ... + vect__4.8_28 = .LEN_LOAD (_17, 32B, _36, 0); + ... + ivtmp_35 = ivtmp_9 - _36; + ... + if (ivtmp_35 != 0) + goto ; [83.33%] + else + goto ; [16.67%] + */ + nitems_total = gimple_convert (preheader_seq, iv_type, nitems_total); + tree step = rgc->controls.length () == 1 ? rgc->controls[0] + : make_ssa_name (iv_type); + /* Create decrement IV. */ + create_iv (nitems_total, MINUS_EXPR, step, NULL_TREE, loop, &incr_gsi, + insert_after, &index_before_incr, &index_after_incr); + gimple_seq_add_stmt (header_seq, gimple_build_assign (step, MIN_EXPR, + index_before_incr, + nitems_step)); + LOOP_VINFO_DECREMENTING_IV_STEP (loop_vinfo) = step; + return index_after_incr; + } + + /* Create increment IV. */ create_iv (build_int_cst (iv_type, 0), PLUS_EXPR, nitems_step, NULL_TREE, loop, &incr_gsi, insert_after, &index_before_incr, &index_after_incr); @@ -683,6 +715,63 @@ vect_set_loop_controls_directly (class loop *loop, loop_vec_info loop_vinfo, return next_ctrl; } +/* Try to use adjust loop lens for multiple-rgroups. + + _36 = MIN_EXPR ; + + First length (MIN (X, VF/N)): + loop_len_15 = MIN_EXPR <_36, VF/N>; + + Second length: + tmp = _36 - loop_len_15; + loop_len_16 = MIN (tmp, VF/N); + + Third length: + tmp2 = tmp - loop_len_16; + loop_len_17 = MIN (tmp2, VF/N); + + Last length: + loop_len_18 = tmp2 - loop_len_17; +*/ + +static void +vect_adjust_loop_lens_control (tree iv_type, gimple_seq *seq, + rgroup_controls *dest_rgm, tree step) +{ + tree ctrl_type = dest_rgm->type; + poly_uint64 nitems_per_ctrl + = TYPE_VECTOR_SUBPARTS (ctrl_type) * dest_rgm->factor; + tree length_limit = build_int_cst (iv_type, nitems_per_ctrl); + + for (unsigned int i = 0; i < dest_rgm->controls.length (); ++i) + { + tree ctrl = dest_rgm->controls[i]; + if (i == 0) + { + /* First iteration: MIN (X, VF/N) capped to the range [0, VF/N]. */ + gassign *assign + = gimple_build_assign (ctrl, MIN_EXPR, step, length_limit); + gimple_seq_add_stmt (seq, assign); + } + else if (i == dest_rgm->controls.length () - 1) + { + /* Last iteration: Remain capped to the range [0, VF/N]. */ + gassign *assign = gimple_build_assign (ctrl, MINUS_EXPR, step, + dest_rgm->controls[i - 1]); + gimple_seq_add_stmt (seq, assign); + } + else + { + /* (MIN (remain, VF*I/N)) capped to the range [0, VF/N]. */ + step = gimple_build (seq, MINUS_EXPR, iv_type, step, + dest_rgm->controls[i - 1]); + gassign *assign + = gimple_build_assign (ctrl, MIN_EXPR, step, length_limit); + gimple_seq_add_stmt (seq, assign); + } + } +} + /* Set up the iteration condition and rgroup controls for LOOP, given that LOOP_VINFO_USING_PARTIAL_VECTORS_P is true for the vectorized loop. LOOP_VINFO describes the vectorization of LOOP. NITERS is @@ -764,6 +853,70 @@ vect_set_loop_condition_partial_vectors (class loop *loop, loop_cond_gsi, rgc, niters, niters_skip, might_wrap_p); + + /* Decrement IV only run vect_set_loop_controls_directly once. */ + if (LOOP_VINFO_USING_DECREMENTING_IV_P (loop_vinfo) + && rgc->controls.length () > 1) + { + /* + - Multiple rgroup (SLP): + ... + _38 = (unsigned long) bnd.7_29; + _39 = _38 * 2; + ... + # ivtmp_41 = PHI + ... + _43 = MIN_EXPR ; + loop_len_26 = MIN_EXPR <_43, 16>; + loop_len_25 = _43 - loop_len_26; + ... + .LEN_STORE (_6, 8B, loop_len_26, ...); + ... + .LEN_STORE (_25, 8B, loop_len_25, ...); + _33 = loop_len_26 / 2; + ... + .LEN_STORE (_8, 16B, _33, ...); + _36 = loop_len_25 / 2; + ... + .LEN_STORE (_15, 16B, _36, ...); + ivtmp_42 = ivtmp_41 - _43; + ... + + - Multiple rgroup (non-SLP): + ... + _38 = (unsigned long) n_12(D); + ... + # ivtmp_38 = PHI + ... + loop_len_38 = MIN_EXPR ; + _43 = MIN_EXPR ; + loop_len_24 = MIN_EXPR <_43, POLY_INT_CST [2, 2]>; + _46 = _43 - loop_len_24; + loop_len_23 = MIN_EXPR <_46, POLY_INT_CST [2, 2]>; + _47 = _46 - loop_len_23; + loop_len_22 = MIN_EXPR <_47, POLY_INT_CST [2, 2]>; + loop_len_21 = _47 - loop_len_22; + ... + vect__4.8_17 = .LEN_LOAD (_6, 64B, loop_len_24, 0); + ... + vect__4.9_9 = .LEN_LOAD (_49, 64B, loop_len_23, 0); + ... + vect__4.10_30 = .LEN_LOAD (_52, 64B, loop_len_22, 0); + ... + vect__4.11_32 = .LEN_LOAD (_55, 64B, loop_len_21, 0); + vect__7.13_31 = VEC_PACK_TRUNC_EXPR <...>, + vect__7.13_32 = VEC_PACK_TRUNC_EXPR <...>; + vect__7.12_33 = VEC_PACK_TRUNC_EXPR <...>; + ... + .LEN_STORE (_14, 16B, _40, vect__7.12_33, 0); + ivtmp_39 = ivtmp_38 - _40; + ... + */ + tree iv_type = LOOP_VINFO_RGROUP_IV_TYPE (loop_vinfo); + tree step = LOOP_VINFO_DECREMENTING_IV_STEP (loop_vinfo); + gcc_assert (step); + vect_adjust_loop_lens_control (iv_type, &header_seq, rgc, step); + } } /* Emit all accumulated statements. */ diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc index cf10132b0bf..456f50fa7cc 100644 --- a/gcc/tree-vect-loop.cc +++ b/gcc/tree-vect-loop.cc @@ -973,6 +973,8 @@ _loop_vec_info::_loop_vec_info (class loop *loop_in, vec_info_shared *shared) vectorizable (false), can_use_partial_vectors_p (param_vect_partial_vector_usage != 0), using_partial_vectors_p (false), + using_decrementing_iv_p (false), + decrementing_iv_step (NULL_TREE), epil_using_partial_vectors_p (false), partial_load_store_bias (0), peeling_for_gaps (false), @@ -2725,6 +2727,17 @@ start_over: && !vect_verify_loop_lens (loop_vinfo)) LOOP_VINFO_CAN_USE_PARTIAL_VECTORS_P (loop_vinfo) = false; + /* If we're vectorizing an loop that uses length "controls" and + can iterate more than once, we apply decrementing IV approach + in loop control. */ + if (LOOP_VINFO_CAN_USE_PARTIAL_VECTORS_P (loop_vinfo) + && !LOOP_VINFO_LENS (loop_vinfo).is_empty () + && LOOP_VINFO_PARTIAL_LOAD_STORE_BIAS (loop_vinfo) == 0 + && !(LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo) + && known_le (LOOP_VINFO_INT_NITERS (loop_vinfo), + LOOP_VINFO_VECT_FACTOR (loop_vinfo)))) + LOOP_VINFO_USING_DECREMENTING_IV_P (loop_vinfo) = true; + /* If we're vectorizing an epilogue loop, the vectorized loop either needs to be able to handle fewer than VF scalars, or needs to have a lower VF than the main loop. */ diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h index 02d2ad6fba1..7ed079f543a 100644 --- a/gcc/tree-vectorizer.h +++ b/gcc/tree-vectorizer.h @@ -818,6 +818,16 @@ public: the vector loop can handle fewer than VF scalars. */ bool using_partial_vectors_p; + /* True if we've decided to use a decrementing loop control IV that counts + scalars. This can be done for any loop that: + + (a) uses length "controls"; and + (b) can iterate more than once. */ + bool using_decrementing_iv_p; + + /* The variable amount step for decrement IV. */ + tree decrementing_iv_step; + /* True if we've decided to use partially-populated vectors for the epilogue of loop. */ bool epil_using_partial_vectors_p; @@ -890,6 +900,8 @@ public: #define LOOP_VINFO_VECTORIZABLE_P(L) (L)->vectorizable #define LOOP_VINFO_CAN_USE_PARTIAL_VECTORS_P(L) (L)->can_use_partial_vectors_p #define LOOP_VINFO_USING_PARTIAL_VECTORS_P(L) (L)->using_partial_vectors_p +#define LOOP_VINFO_USING_DECREMENTING_IV_P(L) (L)->using_decrementing_iv_p +#define LOOP_VINFO_DECREMENTING_IV_STEP(L) (L)->decrementing_iv_step #define LOOP_VINFO_EPIL_USING_PARTIAL_VECTORS_P(L) \ (L)->epil_using_partial_vectors_p #define LOOP_VINFO_PARTIAL_LOAD_STORE_BIAS(L) (L)->partial_load_store_bias -- 2.36.3