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(verify_addresses): New function.

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(find_splittable_givs): Use verify_addresses instead of memory_address_p.

From-SVN: r9909
This commit is contained in:
Richard Kenner 1995-06-08 19:11:30 -04:00
parent 82580166a8
commit d8191d8627
1 changed files with 32 additions and 16 deletions
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48
gcc/unroll.c
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@ -2480,6 +2480,33 @@ find_splittable_regs (unroll_type, loop_start, loop_end, end_insert_before,
return result;
}
/* Return 1 if the first and last unrolled copy of the address giv V is valid
for the instruction that is using it. Do not make any changes to that
instruction. */
static int
verify_addresses (v, giv_inc, unroll_number)
struct induction *v;
rtx giv_inc;
int unroll_number;
{
int ret = 1;
rtx orig_addr = *v->location;
rtx last_addr = plus_constant (v->dest_reg,
INTVAL (giv_inc) * (unroll_number - 1));
/* First check to see if either address would fail. */
if (! validate_change (v->insn, v->location, v->dest_reg, 0)
|| ! validate_change (v->insn, v->location, last_addr, 0))
ret = 0;
/* Now put things back the way they were before. This will always
succeed. */
validate_change (v->insn, v->location, orig_addr, 0);
return ret;
}
/* For every giv based on the biv BL, check to determine whether it is
splittable. This is a subroutine to find_splittable_regs ().
@ -2711,11 +2738,7 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment,
Try to validate both the first and the last
address resulting from loop unrolling, if
one fails, then can't do const elim here. */
if (memory_address_p (v->mem_mode, v->dest_reg)
&& memory_address_p (v->mem_mode,
plus_constant (v->dest_reg,
INTVAL (giv_inc)
* (unroll_number - 1))))
if (! verify_addresses (v, giv_inc, unroll_number))
{
/* Save the negative of the eliminated const, so
that we can calculate the dest_reg's increment
@ -2736,13 +2759,10 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment,
/* If the address hasn't been checked for validity yet, do so
now, and fail completely if either the first or the last
unrolled copy of the address is not a valid address. */
unrolled copy of the address is not a valid address
for the instruction that uses it. */
if (v->dest_reg == tem
&& (! memory_address_p (v->mem_mode, v->dest_reg)
|| ! memory_address_p (v->mem_mode,
plus_constant (v->dest_reg,
INTVAL (giv_inc)
* (unroll_number -1)))))
&& ! verify_addresses (v, giv_inc, unroll_number))
{
if (loop_dump_stream)
fprintf (loop_dump_stream,
@ -2788,11 +2808,7 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment,
/* Check the resulting address for validity, and fail
if the resulting address would be invalid. */
if (! memory_address_p (v->mem_mode, v->dest_reg)
|| ! memory_address_p (v->mem_mode,
plus_constant (v->dest_reg,
INTVAL (giv_inc) *
(unroll_number -1))))
if (! verify_addresses (v, giv_inc, unroll_number))
{
if (loop_dump_stream)
fprintf (loop_dump_stream,