bug in memc.. intrinsic

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1 total messages Started by watson Wed, 26 Aug 1992 18:16

#30

Author: watson
Date: Wed, 26 Aug 1992 18:16

17 lines
1219 bytes

Everyone probably knows this, but I thought I should post it,
just incase SCO didn't know it yet.

There is a BUG in the intrinsic version of memcpy and similar
routines.  It is ok as a subroutine, but the intrinsic version
does not type cast the lenght to a long.  If you call it with a
short, it will use whatever junk you had most recently in the
high order 16 bits of the register.

It can be fixed with a define, but not the (long)(len) that you
would first expect.  That has problems, but just using len+0, will
force the complier to think about it with some arithmetic, and
then it gets the right answer.  Only a statement or two of extra
code is generated, if any.

John Watson ... a non-profit re-seller, maby next year I can make some money!

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