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emit-rtl.c (change_address, [...]): Return early when there is nothing to change. 

* emit-rtl.c (change_address, adjust_address_1, offset_address,
	widen_memory_access):  Return early when there is nothing to change.

From-SVN: r76512
This commit is contained in:
Jan Hubicka 2004-01-24 16:31:04 +01:00 committed by Jan Hubicka
parent 8865bf80ee
commit fdb1c7b358
2 changed files with 22 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-01-24 Jan Hubicka <jh@suse.cz>
* emit-rtl.c (change_address, adjust_address_1, offset_address,
widen_memory_access): Return early when there is nothing to change.
2004-01-24 Jakub Jelinek <jakub@redhat.com>
* simplify-rtx.c (simplify_relational_operation): Don't

17
gcc/emit-rtl.c
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@ -1872,6 +1872,10 @@ change_address (rtx memref, enum machine_mode mode, rtx addr)
rtx new = change_address_1 (memref, mode, addr, 1);
enum machine_mode mmode = GET_MODE (new);
/* If there are no changes, just return the original memory reference. */
if (new == memref)
return new;
MEM_ATTRS (new)
= get_mem_attrs (MEM_ALIAS_SET (memref), 0, 0,
mmode == BLKmode ? 0 : GEN_INT (GET_MODE_SIZE (mmode)),
@ -1898,6 +1902,11 @@ adjust_address_1 (rtx memref, enum machine_mode mode, HOST_WIDE_INT offset,
rtx size = 0;
unsigned int memalign = MEM_ALIGN (memref);
/* If there are no changes, just return the original memory reference. */
if (mode == GET_MODE (memref) && !offset
&& (!validate || memory_address_p (mode, addr)))
return memref;
/* ??? Prefer to create garbage instead of creating shared rtl.
This may happen even if offset is nonzero -- consider
(plus (plus reg reg) const_int) -- so do this always. */
@ -1988,6 +1997,10 @@ offset_address (rtx memref, rtx offset, unsigned HOST_WIDE_INT pow2)
update_temp_slot_address (XEXP (memref, 0), new);
new = change_address_1 (memref, VOIDmode, new, 1);
/* If there are no changes, just return the original memory reference. */
if (new == memref)
return new;
/* Update the alignment to reflect the offset. Reset the offset, which
we don't know. */
MEM_ATTRS (new)
@ -2032,6 +2045,10 @@ widen_memory_access (rtx memref, enum machine_mode mode, HOST_WIDE_INT offset)
rtx memoffset = MEM_OFFSET (new);
unsigned int size = GET_MODE_SIZE (mode);
/* If there are no changes, just return the original memory reference. */
if (new == memref)
return new;
/* If we don't know what offset we were at within the expression, then
we can't know if we've overstepped the bounds. */
if (! memoffset)