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arm.h (DATA_ALIGNMENT): Align structures, unions and arrays to a word boundary.

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* arm.h (DATA_ALIGNMENT): Align structures, unions and arrays to
	a word boundary.
	(LOCAL_ALIGNMENT): Similarly.

From-SVN: r143566
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Richard Earnshaw 2009-01-22 11:17:53 +00:00 committed by Richard Earnshaw
parent 442dc742e4
commit 963392680f
2 changed files with 19 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2009-01-22 Richard Earnshaw <rearnsha@arm.com>
* arm.h (DATA_ALIGNMENT): Align structures, unions and arrays to
a word boundary.
(LOCAL_ALIGNMENT): Similarly.
2009-01-22 Mark Shinwell <shinwell@codesourcery.com>
Joseph Myers <joseph@codesourcery.com>

13
gcc/config/arm/arm.h
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@ -564,6 +564,19 @@ extern int arm_arch_hwdiv;
&& (ALIGN) < BITS_PER_WORD * CONSTANT_ALIGNMENT_FACTOR) \
? BITS_PER_WORD * CONSTANT_ALIGNMENT_FACTOR : (ALIGN))
/* Align definitions of arrays, unions and structures so that
initializations and copies can be made more efficient. This is not
ABI-changing, so it only affects places where we can see the
definition. */
#define DATA_ALIGNMENT(EXP, ALIGN) \
((((ALIGN) < BITS_PER_WORD) \
&& (TREE_CODE (EXP) == ARRAY_TYPE \
|| TREE_CODE (EXP) == UNION_TYPE \
|| TREE_CODE (EXP) == RECORD_TYPE)) ? BITS_PER_WORD : (ALIGN))
/* Similarly, make sure that objects on the stack are sensibly aligned. */
#define LOCAL_ALIGNMENT(EXP, ALIGN) DATA_ALIGNMENT(EXP, ALIGN)
/* Setting STRUCTURE_SIZE_BOUNDARY to 32 produces more efficient code, but the
value set in previous versions of this toolchain was 8, which produces more
compact structures. The command line option -mstructure_size_boundary=<n>