https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111725
--- Comment #1 from CVS Commits ---
The trunk branch has been updated by Lehua Ding :
https://gcc.gnu.org/g:29331e72d0ce9fe8aabdeb8c320b99943b9e067a
commit r14-4773-g29331e72d0ce9fe8aabdeb8c320b99943b9e067a
Author: Lehua Ding
Date: Fri Oct 20 10:22:43 2023 +0800
RISC-V: Refactor and cleanup vsetvl pass
This patch refactors and cleanups the vsetvl pass in order to make the code
easier to modify and understand. This patch does several things:
1. Introducing a virtual CFG for vsetvl infos and Phase 1, 2 and 3 only
maintain
and modify this virtual CFG. Phase 4 performs insertion, modification
and
deletion of vsetvl insns based on the virtual CFG. The basic block in
the
virtual CFG is called vsetvl_block_info and the vsetvl information
inside
is called vsetvl_info.
2. Combine Phase 1 and 2 into a single Phase 1 and unified the demand
system,
this phase only fuse local vsetvl info in forward direction.
3. Refactor Phase 3, change the logic for determining whether to uplift
vsetvl
info to a pred basic block to a more unified method that there is a
vsetvl
info in the vsetvl defintion reaching in compatible with it.
4. Place all modification operations to the RTL in Phase 4 and Phase 5.
Phase 4 is responsible for inserting, modifying and deleting vsetvl
instructions based on fully optimized vsetvl infos. Phase 5 removes the
avl
operand from the RVV instruction and removes the unused dest operand
register from the vsetvl insns.
These modifications resulted in some testcases needing to be updated. The
reasons
for updating are summarized below:
1. more optimized
vlmax_back_prop-{25,26}.c
vlmax_conflict-{3,12}.c/vsetvl-{13,23}.c/vsetvl-23.c/
avl_single-{23,84,95}.c/pr109773-1.c
2. less unnecessary fusion
avl_single-46.c/imm_bb_prop-1.c/pr109743-2.c/vsetvl-18.c
3. local fuse direction (backward -> forward)
scalar_move-1.c
4. add some bugfix testcases.
pr111037-{3,4}.c/pr111037-4.c
avl_single-{89,104,105,106,107,108,109}.c
PR target/111037
PR target/111234
PR target/111725
gcc/ChangeLog:
* config/riscv/riscv-vsetvl.cc (bitmap_union_of_preds_with_entry):
New.
(debug): Removed.
(compute_reaching_defintion): New.
(enum vsetvl_type): Moved.
(vlmax_avl_p): Moved.
(enum emit_type): Moved.
(vlmul_to_str): Moved.
(vlmax_avl_insn_p): Removed.
(policy_to_str): Moved.
(loop_basic_block_p): Removed.
(valid_sew_p): Removed.
(vsetvl_insn_p): Moved.
(vsetvl_vtype_change_only_p): Removed.
(after_or_same_p): Removed.
(before_p): Removed.
(anticipatable_occurrence_p): Removed.
(available_occurrence_p): Removed.
(insn_should_be_added_p): Removed.
(get_all_sets): Moved.
(get_same_bb_set): Moved.
(gen_vsetvl_pat): Removed.
(calculate_vlmul): Moved.
(get_max_int_sew): New.
(emit_vsetvl_insn): Removed.
(get_max_float_sew): New.
(eliminate_insn): Removed.
(insert_vsetvl): Removed.
(count_regno_occurrences): Moved.
(get_vl_vtype_info): Removed.
(enum def_type): Moved.
(validate_change_or_fail): Moved.
(change_insn): Removed.
(get_all_real_uses): Moved.
(get_forward_read_vl_insn): Removed.
(get_backward_fault_first_load_insn): Removed.
(change_vsetvl_insn): Removed.
(avl_source_has_vsetvl_p): Removed.
(source_equal_p): Moved.
(calculate_sew): Removed.
(same_equiv_note_p): Moved.
(get_expr_id): New.
(incompatible_avl_p): Removed.
(get_regno): New.
(different_sew_p): Removed.
(get_bb_index): New.
(different_lmul_p): Removed.
(has_no_uses): Moved.
(different_ratio_p): Removed.
(different_tail_policy_p): Removed.
(different_mask_policy_p): Removed.
(possible_zero_avl_p): Removed.
(enum demand_flags): New.
(second_ratio_invalid_for_first_sew_p): Removed.
(second_ratio_invalid_for_first_lmul_p): Removed.
(enum class): New.
(float_insn_valid_sew_p): Removed.
(second_sew_less_than_first_sew_p): Removed.
(first_sew_less_than_second_sew_p): Removed.
(class vsetvl_info): New.
(compare_lmul): Removed.
(second_lmul_less_than_first_lmul_p): Removed.
(second_ratio_less_than_first_ratio_p): Removed.
(DEF_INCOMPATIBLE_COND): Removed.
