diff options
Diffstat (limited to 'gcc/config/sparc/sparc.h')
| -rw-r--r-- | gcc/config/sparc/sparc.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/gcc/config/sparc/sparc.h b/gcc/config/sparc/sparc.h index 589a129e972..7d02de32def 100644 --- a/gcc/config/sparc/sparc.h +++ b/gcc/config/sparc/sparc.h @@ -545,6 +545,11 @@ extern int target_flags; #define MASK_V8PLUS 0x2000000 #define TARGET_V8PLUS (target_flags & MASK_V8PLUS) +/* Force a the fastest alignment on structures to take advantage of + faster copies. */ +#define MASK_FASTER_STRUCTS 0x4000000 +#define TARGET_FASTER_STRUCTS (target_flags & MASK_FASTER_STRUCTS) + /* TARGET_HARD_MUL: Use hardware multiply instructions but not %y. TARGET_HARD_MUL32: Use hardware multiply instructions with rd %y to get high 32 bits. False in V8+ or V9 because multiply stores @@ -603,6 +608,8 @@ extern int target_flags; {"64", MASK_64BIT, "Use 64-bit ABI" }, \ {"stack-bias", MASK_STACK_BIAS, "Use stack bias" }, \ {"no-stack-bias", -MASK_STACK_BIAS, "Do not use stack bias" }, \ + {"faster-structs", MASK_FASTER_STRUCTS, "Use structs on stronger alignment for double-word copies" }, \ + {"no-faster-structs", -MASK_FASTER_STRUCTS, "Do not use structs on stronger alignment for double-word copies" }, \ SUBTARGET_SWITCHES \ { "", TARGET_DEFAULT, ""}} @@ -799,6 +806,23 @@ if (TARGET_ARCH64 \ /* The best alignment to use in cases where we have a choice. */ #define FASTEST_ALIGNMENT 64 +/* Define this macro as an expression for the alignment of a structure + (given by STRUCT as a tree node) if the alignment computed in the + usual way is COMPUTED and the alignment explicitly specified was + SPECIFIED. + + The default is to use SPECIFIED if it is larger; otherwise, use + the smaller of COMPUTED and `BIGGEST_ALIGNMENT' */ +#define ROUND_TYPE_ALIGN(STRUCT, COMPUTED, SPECIFIED) \ + (TARGET_FASTER_STRUCTS ? \ + ((TREE_CODE (STRUCT) == RECORD_TYPE \ + || TREE_CODE (STRUCT) == UNION_TYPE \ + || TREE_CODE (STRUCT) == QUAL_UNION_TYPE) \ + && TYPE_FIELDS (STRUCT) != 0 \ + ? MAX (MAX ((COMPUTED), (SPECIFIED)), BIGGEST_ALIGNMENT) \ + : MAX ((COMPUTED), (SPECIFIED))) \ + : MAX ((COMPUTED), (SPECIFIED))) + /* Make strings word-aligned so strcpy from constants will be faster. */ #define CONSTANT_ALIGNMENT(EXP, ALIGN) \ ((TREE_CODE (EXP) == STRING_CST \ |