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Revert these two patches:
Thu Jun 17 21:34:24 1999 J"orn Rennecke <amylaar@cygnus.co.uk> * loop.c (strength_reduce): When doing biv->giv conversion, update reg note of NEXT->insn. Thu Jun 17 17:22:07 1999 J"orn Rennecke <amylaar@cygnus.co.uk> * loop.c (strength_reduce): When doing biv->giv conversion, fix up reg_biv_class. (recombine_givs): Set ix field after sorting. From-SVN: r27727
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@ -1,3 +1,16 @@
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Thu Jun 24 15:00:47 1999 Mark Mitchell <mark@codesourcery.com>
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Revert these two patches:
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Thu Jun 17 21:34:24 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
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* loop.c (strength_reduce): When doing biv->giv conversion, update
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reg note of NEXT->insn.
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Thu Jun 17 17:22:07 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
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* loop.c (strength_reduce): When doing biv->giv conversion, fix up
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reg_biv_class.
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(recombine_givs): Set ix field after sorting.
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Wed Jun 23 21:26:00 1999 J"orn Rennecke <amylaar@cygnus.co.uk>
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* rtlanal.c (reg_referenced_p): Use reg_overlap_mentioned_p
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25
gcc/loop.c
25
gcc/loop.c
@ -4065,7 +4065,6 @@ strength_reduce (scan_start, end, loop_top, insn_count,
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fprintf (loop_dump_stream, "is giv of biv %d\n", bl2->regno);
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/* Let this giv be discovered by the generic code. */
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REG_IV_TYPE (bl->regno) = UNKNOWN_INDUCT;
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reg_biv_class[bl->regno] = NULL_PTR;
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/* We can get better optimization if we can move the giv setting
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before the first giv use. */
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if (dominator
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@ -4117,13 +4116,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
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}
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/* Remove this biv from the chain. */
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if (bl->next)
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{
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/* We move the following giv from *bl->next into *bl.
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We have to update reg_biv_class for that moved biv
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to point to its new address. */
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*bl = *bl->next;
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reg_biv_class[bl->regno] = bl;
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}
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*bl = *bl->next;
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else
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{
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*backbl = 0;
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@ -4198,7 +4191,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
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for (vp = &bl->biv, next = *vp; v = next, next = v->next_iv;)
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{
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HOST_WIDE_INT offset;
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rtx set, add_val, old_reg, dest_reg, last_use_insn, note;
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rtx set, add_val, old_reg, dest_reg, last_use_insn;
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int old_regno, new_regno;
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if (! v->always_executed
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@ -4304,13 +4297,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
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REG_IV_TYPE (new_regno) = GENERAL_INDUCT;
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REG_IV_INFO (new_regno) = v;
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/* If next_insn has a REG_EQUAL note that mentiones OLD_REG,
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it must be replaced. */
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note = find_reg_note (next->insn, REG_EQUAL, NULL_RTX);
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if (note && reg_mentioned_p (old_reg, XEXP (note, 0)))
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XEXP (note, 0) = copy_rtx (SET_SRC (single_set (next->insn)));
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/* Remove the increment from the list of biv increments,
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and record it as a giv. */
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*vp = next;
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@ -7210,18 +7197,16 @@ recombine_givs (bl, loop_start, loop_end, unroll_p)
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for (p = v->insn; INSN_UID (p) >= max_uid_for_loop; )
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p = PREV_INSN (p);
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stats[i].start_luid = INSN_LUID (p);
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v->ix = i;
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i++;
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}
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qsort (stats, giv_count, sizeof(*stats), cmp_recombine_givs_stats);
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/* Set up the ix field for each giv in stats to name
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the corresponding index into stats, and
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do the actual most-recently-used recombination. */
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/* Do the actual most-recently-used recombination. */
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for (last_giv = 0, i = giv_count - 1; i >= 0; i--)
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{
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v = giv_array[stats[i].giv_number];
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v->ix = i;
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if (v->same)
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{
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struct induction *old_same = v->same;
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