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tree.h (get_pointer_alignment_1): Declare.

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2012-01-25  Richard Guenther  <rguenther@suse.de>

	* tree.h (get_pointer_alignment_1): Declare.
	* builtins.c (get_pointer_alignment_1): New function.
	(get_pointer_alignment): Use it.

From-SVN: r183514
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Richard Guenther 2012-01-25 11:14:28 +00:00 committed by Richard Biener
parent fcc82a7a8a
commit 87c0fb4bcb
3 changed files with 46 additions and 17 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2012-01-25 Richard Guenther <rguenther@suse.de>
* tree.h (get_pointer_alignment_1): Declare.
* builtins.c (get_pointer_alignment_1): New function.
(get_pointer_alignment): Use it.
2012-01-25 Ramana Radhakrishnan <ramana.radhakrishnan@linaro.org>
PR rtl-optimization/48308

56
gcc/builtins.c
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@ -477,6 +477,35 @@ get_object_or_type_alignment (tree exp)
return align;
}
/* For a pointer valued expression EXP compute values M and N such that
M divides (EXP - N) and such that N < M. Store N in *BITPOSP and return M.
If EXP is not a pointer, 0 is returned. */
unsigned int
get_pointer_alignment_1 (tree exp, unsigned HOST_WIDE_INT *bitposp)
{
STRIP_NOPS (exp);
if (TREE_CODE (exp) == ADDR_EXPR)
return get_object_alignment_1 (TREE_OPERAND (exp, 0), bitposp);
else if (TREE_CODE (exp) == SSA_NAME
&& POINTER_TYPE_P (TREE_TYPE (exp)))
{
struct ptr_info_def *pi = SSA_NAME_PTR_INFO (exp);
if (!pi)
{
*bitposp = 0;
return BITS_PER_UNIT;
}
*bitposp = pi->misalign * BITS_PER_UNIT;
return pi->align * BITS_PER_UNIT;
}
*bitposp = 0;
return POINTER_TYPE_P (TREE_TYPE (exp)) ? BITS_PER_UNIT : 0;
}
/* Return the alignment in bits of EXP, a pointer valued expression.
The alignment returned is, by default, the alignment of the thing that
EXP points to. If it is not a POINTER_TYPE, 0 is returned.
@ -487,25 +516,18 @@ get_object_or_type_alignment (tree exp)
unsigned int
get_pointer_alignment (tree exp)
{
STRIP_NOPS (exp);
unsigned HOST_WIDE_INT bitpos = 0;
unsigned int align;
align = get_pointer_alignment_1 (exp, &bitpos);
if (TREE_CODE (exp) == ADDR_EXPR)
return get_object_alignment (TREE_OPERAND (exp, 0));
else if (TREE_CODE (exp) == SSA_NAME
&& POINTER_TYPE_P (TREE_TYPE (exp)))
{
struct ptr_info_def *pi = SSA_NAME_PTR_INFO (exp);
unsigned align;
if (!pi)
return BITS_PER_UNIT;
if (pi->misalign != 0)
align = (pi->misalign & -pi->misalign);
else
align = pi->align;
return align * BITS_PER_UNIT;
}
/* align and bitpos now specify known low bits of the pointer.
ptr & (align - 1) == bitpos. */
return POINTER_TYPE_P (TREE_TYPE (exp)) ? BITS_PER_UNIT : 0;
if (bitpos != 0)
align = (bitpos & -bitpos);
return align;
}
/* Compute the length of a C string. TREE_STRING_LENGTH is not the right

1
gcc/tree.h
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@ -5450,6 +5450,7 @@ extern bool is_builtin_fn (tree);
extern unsigned int get_object_alignment_1 (tree, unsigned HOST_WIDE_INT *);
extern unsigned int get_object_alignment (tree);
extern unsigned int get_object_or_type_alignment (tree);
extern unsigned int get_pointer_alignment_1 (tree, unsigned HOST_WIDE_INT *);
extern unsigned int get_pointer_alignment (tree);
extern tree fold_call_stmt (gimple, bool);
extern tree gimple_fold_builtin_snprintf_chk (gimple, tree, enum built_in_function);