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emit-rtl.c (set_mem_attributes_minus_bitpos): Remove dead code. 

2012-06-12  Richard Guenther  <rguenther@suse.de>

	* emit-rtl.c (set_mem_attributes_minus_bitpos): Remove dead code.
	* alias.c (ao_ref_from_mem): MEM_EXPR is conservative, MEM_OFFSET
	and MEM_SIZE only refines it.  Reflect that and be less conservative
	if either of the latter is not known.

From-SVN: r188429
This commit is contained in:
Richard Guenther 2012-06-12 08:43:55 +00:00 committed by Richard Biener
parent 891ca07d49
commit f68396a1e0
3 changed files with 13 additions and 18 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2012-06-12 Richard Guenther <rguenther@suse.de>
* emit-rtl.c (set_mem_attributes_minus_bitpos): Remove dead code.
* alias.c (ao_ref_from_mem): MEM_EXPR is conservative, MEM_OFFSET
and MEM_SIZE only refines it. Reflect that and be less conservative
if either of the latter is not known.
2012-06-12 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/53589

15
gcc/alias.c
View File

@ -326,17 +326,11 @@ ao_ref_from_mem (ao_ref *ref, const_rtx mem)
ref->ref_alias_set = MEM_ALIAS_SET (mem);
/* If MEM_OFFSET or MEM_SIZE are unknown we have to punt.
Keep points-to related information though. */
/* If MEM_OFFSET or MEM_SIZE are unknown what we got from MEM_EXPR
is conservative, so trust it. */
if (!MEM_OFFSET_KNOWN_P (mem)
|| !MEM_SIZE_KNOWN_P (mem))
{
ref->ref = NULL_TREE;
ref->offset = 0;
ref->size = -1;
ref->max_size = -1;
return true;
}
return true;
/* If the base decl is a parameter we can have negative MEM_OFFSET in
case of promoted subregs on bigendian targets. Trust the MEM_EXPR
@ -345,6 +339,9 @@ ao_ref_from_mem (ao_ref *ref, const_rtx mem)
&& (MEM_SIZE (mem) + MEM_OFFSET (mem)) * BITS_PER_UNIT == ref->size)
return true;
/* Otherwise continue and refine size and offset we got from analyzing
MEM_EXPR by using MEM_SIZE and MEM_OFFSET. */
ref->offset += MEM_OFFSET (mem) * BITS_PER_UNIT;
ref->size = MEM_SIZE (mem) * BITS_PER_UNIT;

9
gcc/emit-rtl.c
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@ -1838,15 +1838,6 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp,
/* ??? Any reason the field size would be different than
the size we got from the type? */
}
/* If this is an indirect reference, record it. */
else if (TREE_CODE (t) == MEM_REF)
{
attrs.expr = t;
attrs.offset_known_p = true;
attrs.offset = 0;
apply_bitpos = bitpos;
}
}
/* If this is an indirect reference, record it. */