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On 64-bit platforms, sizeof(arena_run_t) includes a padding at the end of the struct to align to 64-bit, since the last field, regs_mask, is 32-bit, and its offset can be a multiple of 64-bit depending on the configuration. But we're doing size calculations for a dynamically-sized regs_mask based on sizeof(arena_run_t), completely ignoring that padding. Instead, we use the offset of regs_mask as a base for the calculation. Practically speaking, this doesn't change much with the current set of values, but could affect the overheads when we squeeze run sizes more. --HG-- extra : rebase_source : a3bdf10a507b81aa0b2b437031b884e18499dc8f |
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