mozilla/shumway — comment on commit dea2d3475cdf53fa2d2b52b9f44a2fe02b3a94c8
File: src/avm2/avm2.js line 55
By mbebenita:

Unfortunately the spec doesn't match reality, (https://mail.mozilla.org/pipermail/tamarin-devel/2011-January/001601.html) there's no sign extension. So for instance, 0x7F is not -1, but it's in fact 127. See: http://hg.mozilla.org/tamarin-central/file/fbecf6c8a86f/core/AbcParser-inlines.h line 50.