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loop.c (strength_reduce): Adjust BENEFIT appropriately if an autoincrement memory reference will...

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* loop.c (strength_reduce): Adjust BENEFIT appropriately if an
        autoincrement memory reference will eliminate add insns.

From-SVN: r13717
This commit is contained in:
Jeff Law 1997-03-16 15:50:56 -07:00
parent c8163b58ed
commit ab16257805
1 changed files with 17 additions and 3 deletions
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20
gcc/loop.c
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@ -3850,9 +3850,23 @@ strength_reduce (scan_start, end, loop_top, insn_count,
unchanged (recompute it from the biv each time it is used).
This decision can be made independently for each giv. */
/* ??? Perhaps attempt to guess whether autoincrement will handle
some of the new add insns; if so, can increase BENEFIT
(undo the subtraction of add_cost that was done above). */
#ifdef AUTO_INC_DEC
/* Attempt to guess whether autoincrement will handle some of the
new add insns; if so, increase BENEFIT (undo the subtraction of
add_cost that was done above). */
if (v->giv_type == DEST_ADDR
&& GET_CODE (v->mult_val) == CONST_INT)
{
#if defined (HAVE_POST_INCREMENT) || defined (HAVE_PRE_INCREMENT)
if (INTVAL (v->mult_val) == GET_MODE_SIZE (v->mem_mode))
benefit += add_cost * bl->biv_count;
#endif
#if defined (HAVE_POST_DECREMENT) || defined (HAVE_PRE_DECREMENT)
if (-INTVAL (v->mult_val) == GET_MODE_SIZE (v->mem_mode))
benefit += add_cost * bl->biv_count;
#endif
}
#endif
/* If an insn is not to be strength reduced, then set its ignore
flag, and clear all_reduced. */