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- Subject: Re: bitop multiplication overflow semantics
- From: Cosmin Apreutesei <cosmin.apreutesei@...>
- Date: Mon, 21 Jan 2013 15:12:46 +0200
(sorry to reply to my own question, but) this gives me the result I
want, i.e. same as what gcc returns:
local function mul_u32(x1, x2)
return tonumber(ffi.cast('uint32_t', ffi.cast('uint32_t', x1) *
mul_u32(0xcc9e2d51, 0xcc9e2d51) -> 0x100193a1
Is this acceptable speedwise or are all of these numbers heap objects?
@Daurnimator: the reason for not keeping everything as cdata objects
is that the bitop library only takes Lua numbers, so I would have to
tonumber() them anyway.