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fix AIX struct/union/field alignment

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From-SVN: r11866
This commit is contained in:
David Edelsohn 1996-04-22 15:52:29 +00:00
parent 75c91bcd75
commit 6bc3403cba
1 changed files with 13 additions and 2 deletions
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15
gcc/config/rs6000/rs6000.h
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@ -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 \