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py: Make qstr hash size configurable, defaults to 2 bytes.

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This patch makes configurable, via MICROPY_QSTR_BYTES_IN_HASH, the
number of bytes used for a qstr hash.  It was originally fixed at 2
bytes, and now defaults to 2 bytes.  Setting it to 1 byte will save
ROM and RAM at a small expense of hash collisions.
This commit is contained in:
Damien George
2015-07-20 11:03:13 +00:00
parent 1e8ca3a3cf
commit c3bd9415cc
5 changed files with 44 additions and 28 deletions
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1
py/qstrdefs.h
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@@ -31,6 +31,7 @@
// qstr configuration passed to makeqstrdata.py of the form QCFG(key, value)
QCFG(BYTES_IN_LEN, MICROPY_QSTR_BYTES_IN_LEN)
QCFG(BYTES_IN_HASH, MICROPY_QSTR_BYTES_IN_HASH)
Q()
Q(*)