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loop.c (strength_reduce): When doing biv->giv conversion, fix up reg_biv_class. 

* loop.c (strength_reduce): When doing biv->giv conversion, fix up
	reg_biv_class.
	(recombine_givs): Set ix field after sorting.

From-SVN: r27565
This commit is contained in:
J"orn Rennecke 1999-06-17 09:32:59 +00:00 committed by Joern Rennecke
parent 227d6ce040
commit 41c1b007f1
2 changed files with 19 additions and 3 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
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.
Thu Jun 17 02:54:30 1999 Jeffrey A Law (law@cygnus.com)
* emit-rtl.c (operand_subword): Tighten checks for when it is safe

15
gcc/loop.c
View File

@ -4058,6 +4058,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
fprintf (loop_dump_stream, "is giv of biv %d\n", bl2->regno);
/* Let this giv be discovered by the generic code. */
REG_IV_TYPE (bl->regno) = UNKNOWN_INDUCT;
reg_biv_class[bl->regno] = NULL_PTR;
/* We can get better optimization if we can move the giv setting
before the first giv use. */
if (dominator
@ -4109,7 +4110,13 @@ strength_reduce (scan_start, end, loop_top, insn_count,
}
/* Remove this biv from the chain. */
if (bl->next)
*bl = *bl->next;
{
/* We move the following giv from *bl->next into *bl.
We have to update reg_biv_class for that moved biv
to point to its new address. */
*bl = *bl->next;
reg_biv_class[bl->regno] = bl;
}
else
{
*backbl = 0;
@ -7190,16 +7197,18 @@ recombine_givs (bl, loop_start, loop_end, unroll_p)
for (p = v->insn; INSN_UID (p) >= max_uid_for_loop; )
p = PREV_INSN (p);
stats[i].start_luid = INSN_LUID (p);
v->ix = i;
i++;
}
qsort (stats, giv_count, sizeof(*stats), cmp_recombine_givs_stats);
/* Do the actual most-recently-used recombination. */
/* Set up the ix field for each giv in stats to name
the corresponding index into stats, and
do the actual most-recently-used recombination. */
for (last_giv = 0, i = giv_count - 1; i >= 0; i--)
{
v = giv_array[stats[i].giv_number];
v->ix = i;
if (v->same)
{
struct induction *old_same = v->same;