[PATCH] rtl-optimization/96812 - remap dependence info on RTL loop unrolling
Richard Biener
rguenther@suse.de
Tue Sep 1 07:09:10 GMT 2020
On Thu, 27 Aug 2020, Richard Biener wrote:
> This carries over the PR87609 fix also to RTL loop unrolling. The
> gcc.dg/torture/pr90328.c testcase otherwise is miscompiled with
> the tree-ssa-address.c hunk (or alternatively with -fno-ivopts
> on master). I've tried to find the correct abstraction and
> adjusted two other duplicate_insn_chain users for which I do not
> have testcases. There may be other insn-chain copying routines
> that could be affected but hopefully most appropriately go through
> CFG hooks.
>
> Bootstrap / regtest running on x86_64-unknown-linux-gnu.
>
> Any comments?
None, so I'll push this later today after re-boostrap/test.
Richard.
> Thanks,
> Richard.
>
> 2020-08-27 Richard Biener <rguenther@suse.de>
>
> PR rtl-optimization/96812
> * tree-ssa-address.c (copy_ref_info): Also copy dependence info.
> * cfgrtl.h (duplicate_insn_chain): Adjust prototype.
> * cfgrtl.c (duplicate_insn_chain): Remap dependence info
> if requested.
> (cfg_layout_duplicate_bb): Make sure we remap dependence info.
> * modulo-sched.c (duplicate_insns_of_cycles): Remap dependence
> info.
> (generate_prolog_epilog): Adjust.
> * config/c6x/c6x.c (hwloop_optimize): Remap dependence info.
> ---
> gcc/cfgrtl.c | 60 ++++++++++++++++++++++++++++++++++++++----
> gcc/cfgrtl.h | 3 ++-
> gcc/config/c6x/c6x.c | 3 ++-
> gcc/modulo-sched.c | 10 ++++---
> gcc/tree-ssa-address.c | 10 +++++++
> 5 files changed, 75 insertions(+), 11 deletions(-)
>
> diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c
> index 03fa688fed6..eb5ccd42ed7 100644
> --- a/gcc/cfgrtl.c
> +++ b/gcc/cfgrtl.c
> @@ -61,6 +61,8 @@ along with GCC; see the file COPYING3. If not see
> #include "cfgloop.h"
> #include "tree-pass.h"
> #include "print-rtl.h"
> +#include "rtl-iter.h"
> +#include "gimplify.h"
>
> /* Disable warnings about missing quoting in GCC diagnostics. */
> #if __GNUC__ >= 10
> @@ -4199,7 +4201,8 @@ cfg_layout_can_duplicate_bb_p (const_basic_block bb)
> }
>
> rtx_insn *
> -duplicate_insn_chain (rtx_insn *from, rtx_insn *to)
> +duplicate_insn_chain (rtx_insn *from, rtx_insn *to,
> + class loop *loop, copy_bb_data *id)
> {
> rtx_insn *insn, *next, *copy;
> rtx_note *last;
> @@ -4228,6 +4231,51 @@ duplicate_insn_chain (rtx_insn *from, rtx_insn *to)
> && ANY_RETURN_P (JUMP_LABEL (insn)))
> JUMP_LABEL (copy) = JUMP_LABEL (insn);
> maybe_copy_prologue_epilogue_insn (insn, copy);
> + /* If requested remap dependence info of cliques brought in
> + via inlining. */
> + if (id)
> + {
> + subrtx_iterator::array_type array;
> + FOR_EACH_SUBRTX (iter, array, PATTERN (insn), ALL)
> + if (MEM_P (*iter) && MEM_EXPR (*iter))
> + {
> + tree op = MEM_EXPR (*iter);
> + if (TREE_CODE (op) == WITH_SIZE_EXPR)
> + op = TREE_OPERAND (op, 0);
> + while (handled_component_p (op))
> + op = TREE_OPERAND (op, 0);
> + if ((TREE_CODE (op) == MEM_REF
> + || TREE_CODE (op) == TARGET_MEM_REF)
> + && MR_DEPENDENCE_CLIQUE (op) > 1
> + && (!loop
> + || (MR_DEPENDENCE_CLIQUE (op)
> + != loop->owned_clique)))
> + {
> + if (!id->dependence_map)
> + id->dependence_map = new hash_map<dependence_hash,
> + unsigned short>;
> + bool existed;
> + unsigned short &newc = id->dependence_map->get_or_insert
> + (MR_DEPENDENCE_CLIQUE (op), &existed);
> + if (!existed)
> + {
> + gcc_assert
> + (MR_DEPENDENCE_CLIQUE (op) <= cfun->last_clique);
> + newc = ++cfun->last_clique;
> + }
> + /* We cannot adjust MR_DEPENDENCE_CLIQUE in-place
> + since MEM_EXPR is shared so make a copy and
> + walk to the subtree again. */
> + tree new_expr = unshare_expr (MEM_EXPR (*iter));
> + if (TREE_CODE (new_expr) == WITH_SIZE_EXPR)
> + new_expr = TREE_OPERAND (new_expr, 0);
> + while (handled_component_p (new_expr))
> + new_expr = TREE_OPERAND (new_expr, 0);
> + MR_DEPENDENCE_CLIQUE (new_expr) = newc;
> + set_mem_expr (const_cast <rtx> (*iter), new_expr);
> + }
> + }
> + }
> break;
>
> case JUMP_TABLE_DATA:
> @@ -4292,12 +4340,14 @@ duplicate_insn_chain (rtx_insn *from, rtx_insn *to)
> /* Create a duplicate of the basic block BB. */
>
> static basic_block
> -cfg_layout_duplicate_bb (basic_block bb, copy_bb_data *)
> +cfg_layout_duplicate_bb (basic_block bb, copy_bb_data *id)
> {
> rtx_insn *insn;
> basic_block new_bb;
>
> - insn = duplicate_insn_chain (BB_HEAD (bb), BB_END (bb));
> + class loop *loop = (id && current_loops) ? bb->loop_father : NULL;
> +
> + insn = duplicate_insn_chain (BB_HEAD (bb), BB_END (bb), loop, id);
> new_bb = create_basic_block (insn,
> insn ? get_last_insn () : NULL,
> EXIT_BLOCK_PTR_FOR_FN (cfun)->prev_bb);
> @@ -4308,7 +4358,7 @@ cfg_layout_duplicate_bb (basic_block bb, copy_bb_data *)
> insn = BB_HEADER (bb);
> while (NEXT_INSN (insn))
> insn = NEXT_INSN (insn);
> - insn = duplicate_insn_chain (BB_HEADER (bb), insn);
> + insn = duplicate_insn_chain (BB_HEADER (bb), insn, loop, id);
> if (insn)
> BB_HEADER (new_bb) = unlink_insn_chain (insn, get_last_insn ());
> }
> @@ -4318,7 +4368,7 @@ cfg_layout_duplicate_bb (basic_block bb, copy_bb_data *)
> insn = BB_FOOTER (bb);
> while (NEXT_INSN (insn))
> insn = NEXT_INSN (insn);
> - insn = duplicate_insn_chain (BB_FOOTER (bb), insn);
> + insn = duplicate_insn_chain (BB_FOOTER (bb), insn, loop, id);
> if (insn)
> BB_FOOTER (new_bb) = unlink_insn_chain (insn, get_last_insn ());
> }
> diff --git a/gcc/cfgrtl.h b/gcc/cfgrtl.h
> index ae03e82650d..ae62d6cf05c 100644
> --- a/gcc/cfgrtl.h
> +++ b/gcc/cfgrtl.h
> @@ -49,7 +49,8 @@ extern bool purge_all_dead_edges (void);
> extern bool fixup_abnormal_edges (void);
> extern rtx_insn *unlink_insn_chain (rtx_insn *, rtx_insn *);
> extern void relink_block_chain (bool);
> -extern rtx_insn *duplicate_insn_chain (rtx_insn *, rtx_insn *);
> +extern rtx_insn *duplicate_insn_chain (rtx_insn *, rtx_insn *,
> + class loop *, class copy_bb_data *);
> extern void cfg_layout_initialize (int);
> extern void cfg_layout_finalize (void);
> extern void break_superblocks (void);
> diff --git a/gcc/config/c6x/c6x.c b/gcc/config/c6x/c6x.c
> index 6bd793bdd21..9aa7ef0620c 100644
> --- a/gcc/config/c6x/c6x.c
> +++ b/gcc/config/c6x/c6x.c
> @@ -5600,7 +5600,8 @@ hwloop_optimize (hwloop_info loop)
> int j;
> rtx_insn *this_iter;
>
> - this_iter = duplicate_insn_chain (head_insn, tail_insn);
> + copy_bb_data id;
> + this_iter = duplicate_insn_chain (head_insn, tail_insn, NULL, &id);
> j = 0;
> while (this_iter)
> {
> diff --git a/gcc/modulo-sched.c b/gcc/modulo-sched.c
> index 86701e05550..6f699a874e3 100644
> --- a/gcc/modulo-sched.c
> +++ b/gcc/modulo-sched.c
> @@ -1085,10 +1085,11 @@ optimize_sc (partial_schedule_ptr ps, ddg_ptr g)
>
> static void
> duplicate_insns_of_cycles (partial_schedule_ptr ps, int from_stage,
> - int to_stage, rtx count_reg)
> + int to_stage, rtx count_reg, class loop *loop)
> {
> int row;
> ps_insn_ptr ps_ij;
> + copy_bb_data id;
>
> for (row = 0; row < ps->ii; row++)
> for (ps_ij = ps->rows[row]; ps_ij; ps_ij = ps_ij->next_in_row)
> @@ -1113,7 +1114,8 @@ duplicate_insns_of_cycles (partial_schedule_ptr ps, int from_stage,
> if (from_stage <= last_u && to_stage >= first_u)
> {
> if (u < ps->g->num_nodes)
> - duplicate_insn_chain (ps_first_note (ps, u), u_insn);
> + duplicate_insn_chain (ps_first_note (ps, u), u_insn,
> + loop, &id);
> else
> emit_insn (copy_rtx (PATTERN (u_insn)));
> }
> @@ -1151,7 +1153,7 @@ generate_prolog_epilog (partial_schedule_ptr ps, class loop *loop,
> }
>
> for (i = 0; i < last_stage; i++)
> - duplicate_insns_of_cycles (ps, 0, i, count_reg);
> + duplicate_insns_of_cycles (ps, 0, i, count_reg, loop);
>
> /* Put the prolog on the entry edge. */
> e = loop_preheader_edge (loop);
> @@ -1165,7 +1167,7 @@ generate_prolog_epilog (partial_schedule_ptr ps, class loop *loop,
> start_sequence ();
>
> for (i = 0; i < last_stage; i++)
> - duplicate_insns_of_cycles (ps, i + 1, last_stage, count_reg);
> + duplicate_insns_of_cycles (ps, i + 1, last_stage, count_reg, loop);
>
> /* Put the epilogue on the exit edge. */
> gcc_assert (single_exit (loop));
> diff --git a/gcc/tree-ssa-address.c b/gcc/tree-ssa-address.c
> index 93eae192212..baf495a00bc 100644
> --- a/gcc/tree-ssa-address.c
> +++ b/gcc/tree-ssa-address.c
> @@ -1044,6 +1044,16 @@ copy_ref_info (tree new_ref, tree old_ref)
> }
> }
>
> + /* We can transfer dependence info. */
> + if (!MR_DEPENDENCE_CLIQUE (new_ref)
> + && (TREE_CODE (base) == MEM_REF
> + || TREE_CODE (base) == TARGET_MEM_REF)
> + && MR_DEPENDENCE_CLIQUE (base))
> + {
> + MR_DEPENDENCE_CLIQUE (new_ref) = MR_DEPENDENCE_CLIQUE (base);
> + MR_DEPENDENCE_BASE (new_ref) = MR_DEPENDENCE_BASE (base);
> + }
> +
> /* And alignment info. Note we cannot transfer misalignment info
> since that sits on the SSA name but this is flow-sensitive info
> which we cannot transfer in this generic routine. */
>
--
Richard Biener <rguenther@suse.de>
SUSE Software Solutions Germany GmbH, Maxfeldstrasse 5, 90409 Nuernberg,
Germany; GF: Felix Imendörffer; HRB 36809 (AG Nuernberg)
More information about the Gcc-patches
mailing list