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cse.c (CSE_ADDRESS_COST): New macro, based on ADDRESS_COST, but dealing with ADDRESSOF.

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* cse.c (CSE_ADDRESS_COST): New macro, based on ADDRESS_COST, but
	dealing with ADDRESSOF.
	(find_best_addr): Use it.

From-SVN: r20945
This commit is contained in:
Mark Mitchell 1998-07-06 09:38:46 +00:00 committed by Mark Mitchell
parent 4fc8ff929a
commit 2f54179908
2 changed files with 35 additions and 17 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Mon Jul 6 09:38:15 1998 Mark Mitchell <mark@markmitchell.com>
* cse.c (CSE_ADDRESS_COST): New macro, based on ADDRESS_COST, but
dealing with ADDRESSOF.
(find_best_addr): Use it.
Mon Jul 6 09:27:08 1998 Richard Henderson <rth@cygnus.com>
* alpha/vms.h (TRAMPOLINE_TEMPLATE): Revert last change.

46
gcc/cse.c
View File

@ -497,6 +497,16 @@ struct table_elt
#define REGNO_QTY_VALID_P(N) (reg_qty[N] != (N))
#ifdef ADDRESS_COST
/* The ADDRESS_COST macro does not deal with ADDRESSOF nodes. But,
during CSE, such nodes are present. Using an ADDRESSOF node which
refers to the address of a REG is a good thing because we can then
turn (MEM (ADDRESSSOF (REG))) into just plain REG. */
#define CSE_ADDRESS_COST(RTX) \
((GET_CODE (RTX) == ADDRESSOF && REG_P (XEXP ((RTX), 0))) \
? -1 : ADDRESS_COST(RTX))
#endif
static struct table_elt *table[NBUCKETS];
/* Chain of `struct table_elt's made so far for this function
@ -2629,8 +2639,8 @@ find_best_addr (insn, loc)
if (1
#ifdef ADDRESS_COST
&& (ADDRESS_COST (folded) < ADDRESS_COST (addr)
|| (ADDRESS_COST (folded) == ADDRESS_COST (addr)
&& (CSE_ADDRESS_COST (folded) < CSE_ADDRESS_COST (addr)
|| (CSE_ADDRESS_COST (folded) == CSE_ADDRESS_COST (addr)
&& rtx_cost (folded, MEM) > rtx_cost (addr, MEM)))
#else
&& rtx_cost (folded, MEM) < rtx_cost (addr, MEM)
@ -2682,23 +2692,25 @@ find_best_addr (insn, loc)
while (found_better)
{
int best_addr_cost = ADDRESS_COST (*loc);
int best_addr_cost = CSE_ADDRESS_COST (*loc);
int best_rtx_cost = (elt->cost + 1) >> 1;
struct table_elt *best_elt = elt;
found_better = 0;
for (p = elt->first_same_value; p; p = p->next_same_value)
if (! p->flag
&& (GET_CODE (p->exp) == REG
|| exp_equiv_p (p->exp, p->exp, 1, 0))
&& (ADDRESS_COST (p->exp) < best_addr_cost
|| (ADDRESS_COST (p->exp) == best_addr_cost
&& (p->cost + 1) >> 1 > best_rtx_cost)))
if (! p->flag)
{
found_better = 1;
best_addr_cost = ADDRESS_COST (p->exp);
best_rtx_cost = (p->cost + 1) >> 1;
best_elt = p;
if ((GET_CODE (p->exp) == REG
|| exp_equiv_p (p->exp, p->exp, 1, 0))
&& (CSE_ADDRESS_COST (p->exp) < best_addr_cost
|| (CSE_ADDRESS_COST (p->exp) == best_addr_cost
&& (p->cost + 1) >> 1 > best_rtx_cost)))
{
found_better = 1;
best_addr_cost = CSE_ADDRESS_COST (p->exp);
best_rtx_cost = (p->cost + 1) >> 1;
best_elt = p;
}
}
if (found_better)
@ -2750,7 +2762,7 @@ find_best_addr (insn, loc)
while (found_better)
{
int best_addr_cost = ADDRESS_COST (*loc);
int best_addr_cost = CSE_ADDRESS_COST (*loc);
int best_rtx_cost = (COST (*loc) + 1) >> 1;
struct table_elt *best_elt = elt;
rtx best_rtx = *loc;
@ -2771,12 +2783,12 @@ find_best_addr (insn, loc)
{
rtx new = cse_gen_binary (GET_CODE (*loc), Pmode, p->exp, c);
if ((ADDRESS_COST (new) < best_addr_cost
|| (ADDRESS_COST (new) == best_addr_cost
if ((CSE_ADDRESS_COST (new) < best_addr_cost
|| (CSE_ADDRESS_COST (new) == best_addr_cost
&& (COST (new) + 1) >> 1 > best_rtx_cost)))
{
found_better = 1;
best_addr_cost = ADDRESS_COST (new);
best_addr_cost = CSE_ADDRESS_COST (new);
best_rtx_cost = (COST (new) + 1) >> 1;
best_elt = p;
best_rtx = new;