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emit-rtl.c (set_mem_attributes_minus_bitpos): Set MEM_READONLY_P for static const strings.

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2011-10-13  Tom de Vries  <tom@codesourcery.com>

	* emit-rtl.c (set_mem_attributes_minus_bitpos): Set MEM_READONLY_P
	for static const strings.
	* varasm.c (build_constant_desc): Generate the memory location of the
	constant using gen_const_mem.

From-SVN: r179896
This commit is contained in:
Tom de Vries 2011-10-13 09:54:50 +00:00 committed by Tom de Vries
parent 6c9fbfa72e
commit ba30e50da2
3 changed files with 14 additions and 1 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2011-10-13 Tom de Vries <tom@codesourcery.com>
* emit-rtl.c (set_mem_attributes_minus_bitpos): Set MEM_READONLY_P
for static const strings.
* varasm.c (build_constant_desc): Generate the memory location of the
constant using gen_const_mem.
2011-10-13 Richard Guenther <rguenther@suse.de>
PR tree-optimization/50698

6
gcc/emit-rtl.c
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@ -1696,6 +1696,12 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp,
&& !TREE_THIS_VOLATILE (base))
MEM_READONLY_P (ref) = 1;
/* Mark static const strings readonly as well. */
if (base && TREE_CODE (base) == STRING_CST
&& TREE_READONLY (base)
&& TREE_STATIC (base))
MEM_READONLY_P (ref) = 1;
/* If this expression uses it's parent's alias set, mark it such
that we won't change it. */
if (component_uses_parent_alias_set (t))

2
gcc/varasm.c
View File

@ -3119,7 +3119,7 @@ build_constant_desc (tree exp)
SET_SYMBOL_REF_DECL (symbol, decl);
TREE_CONSTANT_POOL_ADDRESS_P (symbol) = 1;
rtl = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (exp)), symbol);
rtl = gen_const_mem (TYPE_MODE (TREE_TYPE (exp)), symbol);
set_mem_attributes (rtl, exp, 1);
set_mem_alias_set (rtl, 0);
set_mem_alias_set (rtl, const_alias_set);