- switch (lowtag_of(header)) {
- case OTHER_IMMEDIATE_0_LOWTAG:
- case OTHER_IMMEDIATE_1_LOWTAG:
-#ifdef OTHER_IMMEDIATE_2_LOWTAG
- case OTHER_IMMEDIATE_2_LOWTAG:
-#endif
-#ifdef OTHER_IMMEDIATE_3_LOWTAG
- case OTHER_IMMEDIATE_3_LOWTAG:
-#endif
- return 1;
- default:
- return 0;
- }
+ /* These lowtags are spaced 4 apart throughout the lowtag space. */
+ return (lowtag_of(header) & 3) == OTHER_IMMEDIATE_0_LOWTAG;