Re: Flat initializer list for union of unnamed struct fields
- From: Peter Colberg <peter@xxxxxxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Mon, 8 Sep 2014 19:22:01 -0400
On Mon, Sep 08, 2014 at 11:40:41PM +0200, Mike Pall wrote:
> Thank you for the bug report and the test case! Fixed in the git
> repository.
Thank you for the fix!
Could LuaJIT compile the initialization of the first union field?
The following code generates “NYI: unsupported C type conversion”:
local ffi = require("ffi")
ffi.cdef[[
typedef union {
struct { double x, y, z, w; };
struct { double s0, s1, s2, s3; };
} cl_double4;
]]
ffi.metatype("cl_double4", {
__add = function(a, b) return
ffi.typeof(a)(a.x + b.x, a.y + b.y, a.z + b.z, a.w + b.w)
end,
})
local N = 100000
local v = ffi.new("cl_double4[?]", N)
local x = ffi.new("cl_double4")
for i = 0, N - 1 do
x = x + v[i]
end
The goal is to define vector algebra for the OpenCL C vector types,
which are defined as unions of unnamed structs to access components
using different notations (x,y,z… or s0,s1,s2…).
Thanks,
Peter
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