langhooks.h (LANG_HOOKS_HONOR_READONLY): New macro.
* langhooks.h (LANG_HOOKS_HONOR_READONLY): New macro. * toplev.h (struct lang_hooks): New field HONOR_READONLY. * emit-rtl.c (set_mem_attributes): Set RTX_UNCHANGING_P from TREE_READONLY and TYPE_READONLY if lang_hooks.honor_readonly. Set alignment from type if INDIRECT_REF. (adjust_address_1, offset_address): Simplify alignment compuitation. * expr.c (expand_expr, case INDIRECT_REF): Don't set RTX_UNCHANGING_P here; done by set_mem_attributes. From-SVN: r46361
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@ -1,3 +1,14 @@
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Fri Oct 19 15:24:39 2001 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
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* langhooks.h (LANG_HOOKS_HONOR_READONLY): New macro.
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* toplev.h (struct lang_hooks): New field HONOR_READONLY.
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* emit-rtl.c (set_mem_attributes): Set RTX_UNCHANGING_P from
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TREE_READONLY and TYPE_READONLY if lang_hooks.honor_readonly.
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Set alignment from type if INDIRECT_REF.
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(adjust_address_1, offset_address): Simplify alignment compuitation.
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* expr.c (expand_expr, case INDIRECT_REF): Don't set RTX_UNCHANGING_P
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here; done by set_mem_attributes.
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2001-10-19 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
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* Makefile.in (rtlanal.o): Depend on $(TM_P_H).
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@ -1672,13 +1672,11 @@ set_mem_attributes (ref, t, objectp)
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front-end routine). */
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set_mem_alias_set (ref, get_alias_set (t));
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/* It is incorrect to set RTX_UNCHANGING_P from TREE_READONLY (type)
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here, because, in C and C++, the fact that a location is accessed
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through a const expression does not mean that the value there can
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never change. */
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MEM_VOLATILE_P (ref) = TYPE_VOLATILE (type);
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MEM_IN_STRUCT_P (ref) = AGGREGATE_TYPE_P (type);
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RTX_UNCHANGING_P (ref)
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|= (lang_hooks.honor_readonly
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&& (TYPE_READONLY (type) || TREE_READONLY (t)));
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/* If we are making an object of this type, we know that it is a scalar if
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the type is not an aggregate. */
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@ -1717,6 +1715,10 @@ set_mem_attributes (ref, t, objectp)
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? GEN_INT (tree_low_cst (TYPE_SIZE_UNIT (TREE_TYPE (t)), 1))
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: 0, DECL_ALIGN (t) / BITS_PER_UNIT);
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/* If this is an INDIRECT_REF, we know its alignment. */
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if (TREE_CODE (t) == INDIRECT_REF)
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set_mem_align (ref, TYPE_ALIGN (type) / BITS_PER_UNIT);
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/* Now see if we can say more about whether it's an aggregate or
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scalar. If we already know it's an aggregate, don't bother. */
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if (MEM_IN_STRUCT_P (ref))
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@ -1860,14 +1862,11 @@ adjust_address_1 (memref, mode, offset, validate)
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if (memoffset)
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memoffset = GEN_INT (offset + INTVAL (memoffset));
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/* If the offset is negative, don't try to update the alignment. If it's
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zero, the alignment hasn't changed. Otherwise, the known alignment may
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be less strict. */
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if (offset < 0)
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memalign = 1;
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while (offset > 0 && (offset % memalign) != 0)
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memalign >>= 1;
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/* Compute the new alignment by taking the MIN of the alignment and the
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lowest-order set bit in OFFSET, but don't change the alignment if OFFSET
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if zero. */
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if (offset != 0)
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memalign = MIN (memalign, offset & -offset);
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MEM_ATTRS (new)
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= get_mem_attrs (MEM_ALIAS_SET (memref), MEM_DECL (memref), memoffset,
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@ -1893,15 +1892,11 @@ offset_address (memref, offset, pow2)
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rtx new = change_address_1 (memref, VOIDmode,
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gen_rtx_PLUS (Pmode, XEXP (memref, 0),
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force_reg (Pmode, offset)), 1);
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unsigned int memalign = MEM_ALIGN (memref);
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/* Update the alignment to reflect the offset. Reset the offset, which
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we don't know. */
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while (pow2 % memalign != 0)
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memalign >>= 1;
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MEM_ATTRS (new) = get_mem_attrs (MEM_ALIAS_SET (memref), MEM_DECL (memref),
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0, 0, memalign);
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0, 0, MIN (MEM_ALIGN (memref), pow2));
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return new;
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}
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@ -6812,13 +6812,6 @@ expand_expr (exp, target, tmode, modifier)
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temp = gen_rtx_MEM (mode, op0);
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set_mem_attributes (temp, exp, 0);
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/* It is incorrect to set RTX_UNCHANGING_P from TREE_READONLY
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here, because, in C and C++, the fact that a location is accessed
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through a pointer to const does not mean that the value there can
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never change. Languages where it can never change should
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also set TREE_STATIC. */
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RTX_UNCHANGING_P (temp) = TREE_READONLY (exp) & TREE_STATIC (exp);
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/* If we are writing to this object and its type is a record with
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readonly fields, we must mark it as readonly so it will
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conflict with readonly references to those fields. */
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@ -39,6 +39,9 @@ Boston, MA 02111-1307, USA. */
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#ifndef LANG_HOOKS_POST_OPTIONS
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#define LANG_HOOKS_POST_OPTIONS NULL
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#endif
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#ifndef LANG_HOOKS_HONOR_READONLY
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#define LANG_HOOKS_HONOR_READONLY 0
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#endif
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/* Declarations of default tree inlining hooks. */
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tree tree_inlining_default_hook_walk_subtrees PARAMS ((tree*, int *,
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@ -108,6 +111,7 @@ int tree_inlining_default_hook_anon_aggr_type_p PARAMS ((tree));
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LANG_HOOKS_INIT_OPTIONS, \
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LANG_HOOKS_DECODE_OPTION, \
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LANG_HOOKS_POST_OPTIONS, \
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LANG_HOOKS_HONOR_READONLY, \
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LANG_HOOKS_TREE_INLINING_INITIALIZER \
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}
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@ -166,6 +166,9 @@ struct lang_hooks
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/* Called when all command line options have been processed. */
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void (*post_options) PARAMS ((void));
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/* Nonzero if TYPE_READONLY and TREE_READONLY should always be honored. */
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int honor_readonly;
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struct lang_hooks_for_tree_inlining tree_inlining;
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/* Whenever you add entries here, make sure you adjust langhooks.h
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