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runtime: add comment to mgc0.h

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Missed that comment in CL 153990043.

LGTM=khr
R=khr
CC=golang-codereviews
https://golang.org/cl/156010043
This commit is contained in:
Dmitriy Vyukov 2014-10-09 17:05:38 +04:00
parent e3727df550
commit f1c0899e6f
1 changed files with 2 additions and 0 deletions
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src/runtime/mgc0.h
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@ -42,6 +42,8 @@ enum {
BitsMask = (1<<BitsPerPointer)-1,
PointersPerByte = 8/BitsPerPointer,
// If you change these, also change scanblock.
// scanblock does "if(bits == BitsScalar || bits == BitsDead)" as "if(bits <= BitsScalar)".
BitsDead = 0,
BitsScalar = 1,
BitsPointer = 2,