Re: More thoughts on Lua 5.2
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- Subject: Re: More thoughts on Lua 5.2
- From: Asko Kauppi <askok@...>
- Date: 2008年2月23日 23:51:40 +0200
The LNUM patch is useful for this as well. It allows one to easily
(with one to two -D flags) set Lua to use any combo of:
LNUM_DOUBLE (default) double precision FP (52 bit mantissa)
LNUM_FLOAT single precision FP (23 bit mantissa)
LNUM_LDOUBLE extra precision FP (80+ bit mantissa,
varies)
LNUM_INT32 -2^31..2^31-1 integer optimized
LNUM_INT64 -2^63..2^63-1 integer optimized
(none) all numbers stored as FP
LNUM_COMPLEX Complex (a+bi) number mode, scalars
may be integer optimized
You'd use -DLNUM_INT64 to get 64-bit integer resolution. That's all.
The patched Lua remains completely compatible to modules etc. -
lua_Integer does become 64 bits wide. Numbers are stored as either 64-
bit ints or doubles internally, but to your Lua code and C API it
wouldn't be known.
-asko
Al Pfalzgraf kirjoitti 22.2.2008 kello 16:45:
In recent work it would have been helpful if the Lua number
accomodated a 64 bit integer.
Would a change of LUA_INTEGER to fpos_t be unacceptable?
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