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add default for CONSTANT_ALIGNMENT

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gcc/ChangeLog:

2015-08-20  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* defaults.h (CONSTANT_ALIGNMENT): New macro definition.
	* builtins.c (get_object_alignment_2): Adjust.
	* varasm.c (align_variable): Likewise.
	(get_variable_align): Likewise.
	(build_constant_desc): Likewise.
	(force_const_mem): Likewise.
	* doc/tm.texi.in: Likewise.
	* doc/tm.texi: Regenerate.

From-SVN: r227052
This commit is contained in:
Trevor Saunders 2015-08-21 01:15:33 +00:00 committed by Trevor Saunders
parent 70b0dcce28
commit 6b00e42da3
6 changed files with 23 additions and 19 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2015-08-20 Trevor Saunders <tbsaunde+gcc@tbsaunde.org>
* defaults.h (CONSTANT_ALIGNMENT): New macro definition.
* builtins.c (get_object_alignment_2): Adjust.
* varasm.c (align_variable): Likewise.
(get_variable_align): Likewise.
(build_constant_desc): Likewise.
(force_const_mem): Likewise.
* doc/tm.texi.in: Likewise.
* doc/tm.texi: Regenerate.
2015-08-20 Trevor Saunders <tbsaunde+gcc@tbsaunde.org>
* genconfig.c (main): Always define HAVE_cc0.

6
gcc/builtins.c
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@ -314,10 +314,9 @@ get_object_alignment_2 (tree exp, unsigned int *alignp,
/* The alignment of a CONST_DECL is determined by its initializer. */
exp = DECL_INITIAL (exp);
align = TYPE_ALIGN (TREE_TYPE (exp));
#ifdef CONSTANT_ALIGNMENT
if (CONSTANT_CLASS_P (exp))
align = (unsigned) CONSTANT_ALIGNMENT (exp, align);
#endif
known_alignment = true;
}
else if (DECL_P (exp))
@ -393,10 +392,9 @@ get_object_alignment_2 (tree exp, unsigned int *alignp,
/* STRING_CST are the only constant objects we allow to be not
wrapped inside a CONST_DECL. */
align = TYPE_ALIGN (TREE_TYPE (exp));
#ifdef CONSTANT_ALIGNMENT
if (CONSTANT_CLASS_P (exp))
align = (unsigned) CONSTANT_ALIGNMENT (exp, align);
#endif
known_alignment = true;
}

4
gcc/defaults.h
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@ -1273,6 +1273,10 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#define WORD_REGISTER_OPERATIONS 0
#endif
#ifndef CONSTANT_ALIGNMENT
#define CONSTANT_ALIGNMENT(EXP, ALIGN) ALIGN
#endif
#ifdef GCC_INSN_FLAGS_H
/* Dependent default target macro definitions

2
gcc/doc/tm.texi
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@ -1098,7 +1098,7 @@ that is being placed in memory. @var{constant} is the constant and
have. The value of this macro is used instead of that alignment to
align the object.
If this macro is not defined, then @var{basic-align} is used.
The default definition just returns @var{basic-align}.
The typical use of this macro is to increase alignment for string
constants to be word aligned so that @code{strcpy} calls that copy

2
gcc/doc/tm.texi.in
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@ -1048,7 +1048,7 @@ that is being placed in memory. @var{constant} is the constant and
have. The value of this macro is used instead of that alignment to
align the object.
If this macro is not defined, then @var{basic-align} is used.
The default definition just returns @var{basic-align}.
The typical use of this macro is to increase alignment for string
constants to be word aligned so that @code{strcpy} calls that copy

17
gcc/varasm.c
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@ -1043,7 +1043,6 @@ align_variable (tree decl, bool dont_output_data)
if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
align = data_align;
#endif
#ifdef CONSTANT_ALIGNMENT
if (DECL_INITIAL (decl) != 0
/* In LTO we have no errors in program; error_mark_node is used
to mark offlined constructors. */
@ -1056,7 +1055,6 @@ align_variable (tree decl, bool dont_output_data)
if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
align = const_align;
}
#endif
}
}
@ -1097,7 +1095,6 @@ get_variable_align (tree decl)
if (! DECL_THREAD_LOCAL_P (decl) || data_align <= BITS_PER_WORD)
align = data_align;
#endif
#ifdef CONSTANT_ALIGNMENT
if (DECL_INITIAL (decl) != 0
/* In LTO we have no errors in program; error_mark_node is used
to mark offlined constructors. */
@ -1110,7 +1107,6 @@ get_variable_align (tree decl)
if (! DECL_THREAD_LOCAL_P (decl) || const_align <= BITS_PER_WORD)
align = const_align;
}
#endif
}
return align;
@ -3286,9 +3282,7 @@ build_constant_desc (tree exp)
architectures so use DATA_ALIGNMENT as well, except for strings. */
if (TREE_CODE (exp) == STRING_CST)
{
#ifdef CONSTANT_ALIGNMENT
DECL_ALIGN (decl) = CONSTANT_ALIGNMENT (exp, DECL_ALIGN (decl));
#endif
}
else
align_variable (decl, 0);
@ -3743,13 +3737,10 @@ force_const_mem (machine_mode mode, rtx x)
/* Align the location counter as required by EXP's data type. */
align = GET_MODE_ALIGNMENT (mode == VOIDmode ? word_mode : mode);
#ifdef CONSTANT_ALIGNMENT
{
tree type = lang_hooks.types.type_for_mode (mode, 0);
if (type != NULL_TREE)
align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
}
#endif
tree type = lang_hooks.types.type_for_mode (mode, 0);
if (type != NULL_TREE)
align = CONSTANT_ALIGNMENT (make_tree (type, x), align);
pool->offset += (align / BITS_PER_UNIT) - 1;
pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);