I have a *very* specific bug in pyopencl: When I use round(88.9f) with
pyopencl from git (2014-04-08) on a Nvidia Ti780, it will give me 88.0
instead of 89.0.
- If I change the gfx card to my older GTX590, it will work.
- If I round doubles instead of floats, it works on both cards.
- If I write a test in C++, it works on both cards.
Can anyone with a Ti780 confirm this bug?
Side info: I have compiled pyopencl with ENABLE_GL=True and
CL_PRETEND_VERSION="1.1" due to missing clCreateSubDevices in nvidia OpenCL.
OS is Ubuntu 14.04.
My test is:
import pyopencl as cl
import numpy as np
ctx = cl.create_some_context()
que = cl.CommandQueue(ctx)
cl_prg = cl.Program(ctx, "__kernel void doit(__global float *a) { a[0] =
round(88.9f); }").build()
a = np.zeros(1, dtype=np.float32); A = cl.Buffer(ctx,
cl.mem_flags.READ_WRITE | cl.mem_flags.COPY_HOST_PTR, hostbuf=a)
cl_prg.doit(que, [1], None, A); que.finish()
cl.enqueue_copy(que, a, A)
print a[0]
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