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loop.h (struct movables): Remove `num'.
* loop.h (struct movables): Remove `num'. * loop.c (scan_loop): Don't set it. Use count_insns_in_loop. Adjust call to strength_reduce. (num_unmoved_movables): New function. (move_movables): Don't set movables->num. (strength_reduce): Compute the number of instructions in the loop here, rather than in the caller. (check_dbra_loop): Always clear reversible_mem_store if there are any memory sets. (loop_regs_scan): Don't count instructions here. (count_insn_in_loop): New function. From-SVN: r41966
This commit is contained in:
Mark Mitchell
Mark Mitchell
parent
897aa57fd0
commit
2868054066
@ -1,3 +1,17 @@
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2001-05-11 Mark Mitchell <mark@codesourcery.com>
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* loop.h (struct movables): Remove `num'.
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* loop.c (scan_loop): Don't set it. Use count_insns_in_loop.
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Adjust call to strength_reduce.
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(num_unmoved_movables): New function.
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(move_movables): Don't set movables->num.
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(strength_reduce): Compute the number of instructions in the loop
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here, rather than in the caller.
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(check_dbra_loop): Always clear reversible_mem_store if there
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are any memory sets.
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(loop_regs_scan): Don't count instructions here.
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(count_insn_in_loop): New function.
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2001-05-11 Mark Mitchell <mark@codesourcery.com>
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* optabs.c (emit_libcall_block): Don't mark calls as CONST_CALL_P.
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82
gcc/loop.c
82
gcc/loop.c
@ -165,6 +165,7 @@ static void ignore_some_movables PARAMS ((struct loop_movables *));
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static void force_movables PARAMS ((struct loop_movables *));
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static void combine_movables PARAMS ((struct loop_movables *,
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struct loop_regs *));
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static int num_unmoved_movables PARAMS ((const struct loop *));
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static int regs_match_p PARAMS ((rtx, rtx, struct loop_movables *));
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static int rtx_equal_for_loop_p PARAMS ((rtx, rtx, struct loop_movables *,
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struct loop_regs *));
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@ -189,7 +190,7 @@ static void loop_givs_reduce PARAMS((struct loop *, struct iv_class *));
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static void loop_givs_rescan PARAMS((struct loop *, struct iv_class *,
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rtx *));
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static void loop_ivs_free PARAMS((struct loop *));
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static void strength_reduce PARAMS ((struct loop *, int, int));
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static void strength_reduce PARAMS ((struct loop *, int));
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static void find_single_use_in_loop PARAMS ((struct loop_regs *, rtx, rtx));
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static int valid_initial_value_p PARAMS ((rtx, rtx, int, rtx));
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static void find_mem_givs PARAMS ((const struct loop *, rtx, rtx, int, int));
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@ -232,7 +233,8 @@ static int last_use_this_basic_block PARAMS ((rtx, rtx));
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static void record_initial PARAMS ((rtx, rtx, void *));
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static void update_reg_last_use PARAMS ((rtx, rtx));
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static rtx next_insn_in_loop PARAMS ((const struct loop *, rtx));
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static void loop_regs_scan PARAMS ((const struct loop*, int, int *));
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static void loop_regs_scan PARAMS ((const struct loop *, int));
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static int count_insns_in_loop PARAMS ((const struct loop *));
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static void load_mems PARAMS ((const struct loop *));
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static int insert_loop_mem PARAMS ((rtx *, void *));
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static int replace_loop_mem PARAMS ((rtx *, void *));
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@ -550,7 +552,6 @@ scan_loop (loop, flags)
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movables->head = 0;
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movables->last = 0;
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movables->num = 0;
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/* Determine whether this loop starts with a jump down to a test at
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the end. This will occur for a small number of loops with a test
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@ -637,7 +638,8 @@ scan_loop (loop, flags)
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/* Allocate extra space for REGs that might be created by load_mems.
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We allocate a little extra slop as well, in the hopes that we
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won't have to reallocate the regs array. */
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loop_regs_scan (loop, loop_info->mems_idx + 16, &insn_count);
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loop_regs_scan (loop, loop_info->mems_idx + 16);
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insn_count = count_insns_in_loop (loop);
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if (loop_dump_stream)
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{
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@ -1006,7 +1008,7 @@ scan_loop (loop, flags)
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/* Recalculate regs->array if load_mems has created new registers. */
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if (max_reg_num () > regs->num)
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loop_regs_scan (loop, 0, &insn_count);
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loop_regs_scan (loop, 0);
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for (update_start = loop_start;
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PREV_INSN (update_start)
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@ -1024,7 +1026,7 @@ scan_loop (loop, flags)
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/* Ensure our label doesn't go away. */
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LABEL_NUSES (update_end)++;
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strength_reduce (loop, insn_count, flags);
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strength_reduce (loop, flags);
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reg_scan_update (update_start, update_end, loop_max_reg);
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loop_max_reg = max_reg_num ();
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@ -1421,6 +1423,24 @@ combine_movables (movables, regs)
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/* Clean up. */
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free (matched_regs);
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}
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/* Returns the number of movable instructions in LOOP that were not
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moved outside the loop. */
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static int
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num_unmoved_movables (loop)
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const struct loop *loop;
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{
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int num = 0;
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struct movable *m;
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for (m = LOOP_MOVABLES (loop)->head; m; m = m->next)
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if (!m->done)
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++num;
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return num;
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}
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/* Return 1 if regs X and Y will become the same if moved. */
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@ -1634,8 +1654,6 @@ move_movables (loop, movables, threshold, insn_count)
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rtx *reg_map = (rtx *) xcalloc (nregs, sizeof (rtx));
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char *already_moved = (char *) xcalloc (nregs, sizeof (char));
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movables->num = 0;
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for (m = movables->head; m; m = m->next)
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{
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/* Describe this movable insn. */
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@ -1664,9 +1682,6 @@ move_movables (loop, movables, threshold, insn_count)
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INSN_UID (m->forces->insn));
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}
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/* Count movables. Value used in heuristics in strength_reduce. */
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movables->num++;
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/* Ignore the insn if it's already done (it matched something else).
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Otherwise, see if it is now safe to move. */
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@ -4200,9 +4215,8 @@ loop_ivs_free (loop)
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must check regnos to make sure they are in bounds. */
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static void
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strength_reduce (loop, insn_count, flags)
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strength_reduce (loop, flags)
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struct loop *loop;
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int insn_count;
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int flags;
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{
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struct loop_info *loop_info = LOOP_INFO (loop);
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@ -4222,6 +4236,7 @@ strength_reduce (loop, insn_count, flags)
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int reg_map_size;
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int unrolled_insn_copies = 0;
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rtx test_reg = gen_rtx_REG (word_mode, LAST_VIRTUAL_REGISTER + 1);
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int insn_count = count_insns_in_loop (loop);
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addr_placeholder = gen_reg_rtx (Pmode);
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@ -7325,12 +7340,11 @@ check_dbra_loop (loop, insn_count)
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{
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struct induction *v;
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reversible_mem_store
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= (! loop_info->unknown_address_altered
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&& ! loop_info->unknown_constant_address_altered
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&& ! loop_invariant_p (loop,
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XEXP (XEXP (loop_info->store_mems, 0),
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0)));
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/* If we could prove that each of the memory locations
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written to was different, then we could reverse the
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store -- but we don't presently have any way of
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knowing that. */
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reversible_mem_store = 0;
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/* If the store depends on a register that is set after the
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store, it depends on the initial value, and is thus not
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@ -7362,7 +7376,7 @@ check_dbra_loop (loop, insn_count)
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&& ! loop_info->has_volatile
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&& reversible_mem_store
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&& (bl->giv_count + bl->biv_count + loop_info->num_mem_sets
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+ LOOP_MOVABLES (loop)->num + compare_and_branch == insn_count)
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+ num_unmoved_movables (loop) + compare_and_branch == insn_count)
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&& (bl == ivs->list && bl->next == 0))
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|| no_use_except_counting)
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{
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@ -8702,16 +8716,12 @@ insert_loop_mem (mem, data)
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parameter may be zero, in which case this processing is not done.
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Set REGS->ARRAY[I].MAY_NOT_OPTIMIZE nonzero if we should not
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optimize register I.
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Store in *COUNT_PTR the number of actual instructions
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in the loop. We use this to decide what is worth moving out. */
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optimize register I. */
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static void
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loop_regs_scan (loop, extra_size, count_ptr)
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loop_regs_scan (loop, extra_size)
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const struct loop *loop;
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int extra_size;
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int *count_ptr;
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{
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struct loop_regs *regs = LOOP_REGS (loop);
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int old_nregs;
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@ -8719,7 +8729,6 @@ loop_regs_scan (loop, extra_size, count_ptr)
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basic block. In that case, it is the insn that last set reg n. */
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rtx *last_set;
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rtx insn;
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int count = 0;
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int i;
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old_nregs = regs->num;
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@ -8754,8 +8763,6 @@ loop_regs_scan (loop, extra_size, count_ptr)
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{
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if (INSN_P (insn))
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{
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++count;
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/* Record registers that have exactly one use. */
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find_single_use_in_loop (regs, insn, PATTERN (insn));
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@ -8798,9 +8805,24 @@ loop_regs_scan (loop, extra_size, count_ptr)
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regs->array[i].n_times_set = regs->array[i].set_in_loop;
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free (last_set);
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*count_ptr = count;
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}
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/* Returns the number of real INSNs in the LOOP. */
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static int
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count_insns_in_loop (loop)
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const struct loop *loop;
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{
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int count = 0;
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rtx insn;
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for (insn = loop->top ? loop->top : loop->start; insn != loop->end;
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insn = NEXT_INSN (insn))
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if (INSN_P (insn))
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++count;
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return count;
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}
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/* Move MEMs into registers for the duration of the loop. */
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@ -289,8 +289,6 @@ struct loop_movables
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struct movable *head;
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/* Last movable in chain. */
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struct movable *last;
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/* Number of movables in the loop. */
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int num;
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};
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