Hi!
25-Мар-2004 00:20 [EMAIL PROTECTED] (Bart Oldeman) wrote to
[EMAIL PROTECTED]:
> From Lucho (and I think Arkady had this as well at some point):
> save 33 bytes by eliminating a switch for memory/UMB access modes.
Yes, it was.
> case 0x01:
> + if ((lr.BL & FIT_U_MASK) > FIRST_FIT_U || /* 0xc0, 0x80 */
> + (lr.BL & FIT_MASK) > LAST_FIT) /* 0x3f, 0x02 */
> + goto error_invalid;
> + mem_access_mode = lr.BL;
> break;
Unlike this code, my code wasn't reject 0xC0 (HIGH_MASK), but this code
also may be simplified:
______________O\_/_________________________________\_/O______________
if (lr.BL >= HIGH_MASK || /* 0xc0 */
(lr.BL & FIT_MASK) > LAST_FIT) /* 0x3f, 0x02 */
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O/~\ /~\O
where in mcb.h was defined:
______________O\_/_________________________________\_/O______________
#define HMASEG 0xFFFF
typedef enum {
LARGEST = -1,
FIRST_FIT = 0,
BEST_FIT = 1,
LAST_FIT = 2,
ALLOC_HIGH = 0x40,
ALLOC_HIGH_LOW = 0x80,
HIGH_MASK = ALLOC_HIGH | ALLOC_HIGH_LOW,
FIT_MASK = ~HIGH_MASK,
LOW_FIRST_FIT = 0, /* low memory first fit */
LOW_BEST_FIT = 1, /* low memory best fit */
LOW_LAST_FIT = 2, /* low memory last fit */
HIGH_FIRST_FIT = 0x40, /* high memory first fit */
HIGH_BEST_FIT = 0x41, /* high memory best fit */
HIGH_LAST_FIT = 0x42, /* high memory last fit */
HIGH_LOW_FIRST_FIT = 0x80, /* high, then low mem first fit */
HIGH_LOW_BEST_FIT = 0x81, /* high, then low mem best fit */
HIGH_LOW_LAST_FIT = 0x82 /* high, then low mem last fit */
} ALLOC_STRATEGY;
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