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if not modules then modules = { } end modules ['l-macro-imp-optimize'] = {
version = 1.001,
comment = "companion to luat-lib.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
-- This is for ConTeXt only and used in development. Only in rare cases we
-- will use this to gain a bit of performance or adapt to specific versions
-- of Lua.
-- There is no real gain as we hardly use these:
--
-- lua.macros.resolvestring [[
-- #define div(a,b) floor(a/b)
-- #define mod(a,b) (a % b)
-- #define odd(a) (a % 2 ~= 0)
-- #define even(a) (a % 2 == 0)
-- #define pow(x,y) (x^y)
-- ]]
if LUAVERSION >= 5.3 and lua.macros then
-- For the moment we only optimize in Lua 5.3:
lua.macros.enabled = true
-- This indirect method makes it possible to use both the functions
-- and the inline variant (which often looks better). Also, a mixed
-- 5,2 and 5.3 source is not possible because the 5.2 doesn't deal
-- with the newer 5.3 syntax.
-- We need to check for 64 usage: 0xFFFFFFFFFFFFFFFF (-1)
-- lua.macros.resolvestring [[
-- #define band(a,b) (a & b)
-- #define bnot(a) (~a & 0xFFFFFFFF)
-- #define bor(a,b) ((a | b) & 0xFFFFFFFF)
-- #define btest(a,b) ((a & b) ~= 0)
-- #define bxor(a,b) ((a ~ b) & 0xFFFFFFFF)
-- #define rshift(a,b) ((a & b) ~= 0)
-- #define extract(a,b,c) ((a >> b) & ~(-1 << c))
-- #define extract(a,b) ((a >> b) & 0x1))
-- #define lshift(a,b) ((a << b) & 0xFFFFFFFF)
-- #define rshift(a,b) ((a >> b) & 0xFFFFFFFF)
-- ]]
lua.macros.resolvestring [[
#define band(a,b) (a&b)
#define bnot(a) (~a&0xFFFFFFFF)
#define bor(a,b) ((a|b)&0xFFFFFFFF)
#define btest(a,b) ((a&b)~=0)
#define bxor(a,b) ((a~b)&0xFFFFFFFF)
#define rshift(a,b) ((a&b)~=0)
#define extract(a,b,c) ((a>>b)&~(-1<<c))
#define extract(a,b) ((a>>b)&0x1))
#define lshift(a,b) ((a<<b)&0xFFFFFFFF)
#define rshift(a,b) ((a>>b)&0xFFFFFFFF)
]]
end
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