diff options
Diffstat (limited to 'erts/emulator/beam/erl_alloc_util.h')
-rw-r--r-- | erts/emulator/beam/erl_alloc_util.h | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/erts/emulator/beam/erl_alloc_util.h b/erts/emulator/beam/erl_alloc_util.h index ea1afe8f58..b46b311c59 100644 --- a/erts/emulator/beam/erl_alloc_util.h +++ b/erts/emulator/beam/erl_alloc_util.h @@ -334,8 +334,11 @@ void erts_alcu_sched_spec_data_init(struct ErtsSchedulerData_ *esdp); #endif #if MBC_ABLK_OFFSET_BITS -# define MBC_ABLK_OFFSET_SHIFT (sizeof(UWord)*8 - MBC_ABLK_OFFSET_BITS) -# define MBC_ABLK_OFFSET_MASK ((~((UWord)0) << MBC_ABLK_OFFSET_SHIFT) & ~BLK_FLG_MASK) +/* The shift is reduced by 1 since the highest bit is used for a flag. */ +# define MBC_ABLK_OFFSET_SHIFT (sizeof(UWord)*8 - 1 - MBC_ABLK_OFFSET_BITS) +# define MBC_ABLK_OFFSET_MASK \ + (((UWORD_CONSTANT(1) << MBC_ABLK_OFFSET_BITS) - UWORD_CONSTANT(1)) \ + << MBC_ABLK_OFFSET_SHIFT) # define MBC_ABLK_SZ_MASK (~MBC_ABLK_OFFSET_MASK & ~BLK_FLG_MASK) #else # define MBC_ABLK_SZ_MASK (~BLK_FLG_MASK) |