On Saturday, February 13, 2016 at 6:56:17 PM UTC-8, Xidorn Quan wrote: > On Sun, Feb 14, 2016 at 10:21 AM, L. David Baron wrote: > > It looks like there's a 32-bit gap on 64-bit builds next to > > mOverflow, and we should probably just put another 32 bits of frame > > state bits there (after double-checking this). We might want to > > separate the class-specific bits into that new 32-bit value, > > although I'm less sure about that. > > If we are putting class-specific bits into separate area, are there > any reason we still perfer the current setting (state bits) over bool > bitfields? > > It seems to me using bitfields would give us more flexibility on > adding and removing flags, and potentially provide more compile time > check. > > I guess we would probably still want to keep bits of text frame in the > same place? > > - Xidorn
I suppose that if a struct/class of 32 booleans fits in that 32-bit gap, then it should be OK memory-wise. I don't know if this gets compiler-specific re: alignment. --Jet _______________________________________________ dev-tech-layout mailing list dev-tech-layout@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-tech-layout
