diff options
Diffstat (limited to 'gcc/regs.h')
| -rw-r--r-- | gcc/regs.h | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/gcc/regs.h b/gcc/regs.h index 08229666021..61b9a49ac02 100644 --- a/gcc/regs.h +++ b/gcc/regs.h @@ -24,12 +24,28 @@ Boston, MA 02111-1307, USA. */ #define REG_BYTES(R) mode_size[(int) GET_MODE (R)] -/* Get the number of consecutive hard regs required to hold the REG rtx R. +/* Get the number of consecutive hard regs required to hold the REG or + SUBREG rtx R. When something may be an explicit hard reg, REG_SIZE is the only - valid way to get this value. You cannot get it from the regno. */ + valid way to get this value. You cannot get it from the regno. + A target may override this definition, the case where you would do + this is where there are registers which are smaller than WORD_SIZE + such as the SFmode registers on sparc64. */ + +#ifndef REG_SIZE #define REG_SIZE(R) \ ((mode_size[(int) GET_MODE (R)] + UNITS_PER_WORD - 1) / UNITS_PER_WORD) +#endif + +/* When you only have the mode of a pseudo register before it has a hard + register chosen for it, this reports the size of each hard register + a pseudo in such a mode would get allocated to. Like REG_SIZE, a + target may override this. */ + +#ifndef REGMODE_NATURAL_SIZE +#define REGMODE_NATURAL_SIZE(MODE) UNITS_PER_WORD +#endif #ifndef SMALL_REGISTER_CLASSES #define SMALL_REGISTER_CLASSES 0 |