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| author | Richard Earnshaw <rearnsha@arm.com> | 2009-01-22 11:17:53 +0000 |
|---|---|---|
| committer | Richard Earnshaw <rearnsha@gcc.gnu.org> | 2009-01-22 11:17:53 +0000 |
| commit | 963392680fda9affbde3be6ce9c1465c1c732e90 (patch) | |
| tree | 907bdf8974d7dcb77d1741fcdf1154a03a3478d4 | |
| parent | 442dc742e44ddfdcd11c81be6ac562fbba62da4b (diff) | |
| download | gcc-963392680fda9affbde3be6ce9c1465c1c732e90.zip gcc-963392680fda9affbde3be6ce9c1465c1c732e90.tar.gz gcc-963392680fda9affbde3be6ce9c1465c1c732e90.tar.bz2 | |
arm.h (DATA_ALIGNMENT): Align structures, unions and arrays to a word boundary.
* arm.h (DATA_ALIGNMENT): Align structures, unions and arrays to
a word boundary.
(LOCAL_ALIGNMENT): Similarly.
From-SVN: r143566
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/config/arm/arm.h | 13 |
2 files changed, 19 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e503435..e8855f3 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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> diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h index f83aaba..fb636f3 100644 --- a/gcc/config/arm/arm.h +++ b/gcc/config/arm/arm.h @@ -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> |