terra vectors don't escape from lua properly as arguments to some terra functions about terra HOT 2 CLOSED

This looks like it might be a LuaJIT issue. I sent an email to the mailing
list to find out.

On Sat, Sep 7, 2013 at 12:44 PM, Crystal Lemire [email protected]:

Whenever I pass more than one terra vector object to a terra function from
lua scope, the 2nd vector does not seem to escape properly. Example code
below. Notice that when lua variable d is passed to the terra add function,

its components are all set to 0, when it should be {4.3, 3.2, 2.1, 1.9}.

local clib = terralib.includec("stdio.h")
terra check (v : vector(float, 4))
clib.printf("contents: %f %f %f %f\n", v[0], v[1], v[2], v[3]);
end

terra create_float_vector (a : float, b : float, c : float, d : float)
return vector(a, b, c, d)
end

terra add (v1 : vector(float, 4), v2 : vector(float, 4)) : vector(float, 4)
var v3 = v1 + v2
check(v1)
check(v2)
return v3
end

c = create_float_vector(1.5, 2.5, 3.5, 4.5)
d = create_float_vector(4.3, 3.2, 2.1, 1.9)

print("vectors initialized to...")
check(c)
check(d)

print()
print("argument values:")
e = add(c, d)

print()
print("result:")
check(e)

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/47
.

from terra.

This bug still exists as in 2 Oct 2014.

I cloned Terra commit 02219d4

This program reproduces the problem. The second argument is always 0.

floatX4 = vector(float, 4)

C = terralib.includec("stdio.h")

w = terralib.new(floatX4, {1, 2, 3, 4})
x = terralib.new(floatX4, {5, 6, 7, 8})

terra addvf_print(a: floatX4, b: floatX4): floatX4
    C.printf("a = %f %f %f %f\n", a[0], a[1], a[2], a[3])
    C.printf("b = %f %f %f %f\n", b[0], b[1], b[2], b[3])  -- always b = 0 0 0 0
    var c = a + b
    C.printf("c = %f %f %f %f\n", c[0], c[1], c[2], c[3])
    return c
end

addvf_print(w, x)
addvf_print(x, w)

from terra.