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| author | David Edelsohn <edelsohn@gnu.org> | 1996-04-22 15:52:29 +0000 |
|---|---|---|
| committer | David Edelsohn <edelsohn@gnu.org> | 1996-04-22 15:52:29 +0000 |
| commit | 6bc3403cba35affa0b7b484a6bacedc801b5638f (patch) | |
| tree | fd837128ed043ab1359dd0139f4a79e984507562 | |
| parent | 75c91bcd752ca5f5be4859f91c90e53d8c1a1c72 (diff) | |
| download | gcc-6bc3403cba35affa0b7b484a6bacedc801b5638f.zip gcc-6bc3403cba35affa0b7b484a6bacedc801b5638f.tar.gz gcc-6bc3403cba35affa0b7b484a6bacedc801b5638f.tar.bz2 | |
fix AIX struct/union/field alignment
From-SVN: r11866
| -rw-r--r-- | gcc/config/rs6000/rs6000.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h index 1620ad4..5582f41 100644 --- a/gcc/config/rs6000/rs6000.h +++ b/gcc/config/rs6000/rs6000.h @@ -572,8 +572,9 @@ extern struct rs6000_cpu_select rs6000_select[]; /* No data type wants to be aligned rounder than this. */ #define BIGGEST_ALIGNMENT 64 -/* AIX aligns internal doubles in structures on word boundaries. */ -#define BIGGEST_FIELD_ALIGNMENT 32 +/* AIX word-aligns FP doubles but doubleword-aligns 64-bit ints. */ +#define ADJUST_FIELD_ALIGN(FIELD, COMPUTED) \ + (DECL_MODE (FIELD) != DFmode ? (COMPUTED) : MIN ((COMPUTED), 32)) /* Alignment of field after `int : 0' in a structure. */ #define EMPTY_FIELD_BOUNDARY 32 @@ -584,6 +585,16 @@ extern struct rs6000_cpu_select rs6000_select[]; /* A bitfield declared as `int' forces `int' alignment for the struct. */ #define PCC_BITFIELD_TYPE_MATTERS 1 +/* AIX increases natural record alignment to doubleword if the first + field is an FP double while the FP fields remain word aligned. */ +#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ + ((TREE_CODE (STRUCT) == RECORD_TYPE \ + || TREE_CODE (STRUCT) == UNION_TYPE \ + || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ + && DECL_MODE (TYPE_FIELDS (STRUCT)) == DFmode \ + ? MAX (MAX ((COMPUTED), (SPECIFIED)), BIGGEST_ALIGNMENT) \ + : MAX ((COMPUTED), (SPECIFIED))) + /* Make strings word-aligned so strcpy from constants will be faster. */ #define CONSTANT_ALIGNMENT(EXP, ALIGN) \ (TREE_CODE (EXP) == STRING_CST \ |