3 Replies Latest reply on Jun 16, 2013 6:27 AM by gouse

    clAmdFft inconsistent results for Real to Hermitian Interleaved

    gouse

      Hi,

       

      I ran into some weird behavior with clAmdFft for

      • CLFFT_OUTOFPLACE
      • CLFFT_REAL to CLFFT_HERMITIAN_INTERLEAVED

      case (which should be supported according to documentation).

       

      I create two buffers cl_mem bufA_in & bufB_in and write there the same input data. Then (after baking FFT plan) perform FFT transform, first on bufA_in, and, second, on bufB_in:

       

           status = clAmdFftEnqueueTransform( plHandle, CLFFT_FORWARD, 1, &queue, 0, NULL, NULL, &bufA_in, &bufA_out, tmp_buf);

           status = clAmdFftEnqueueTransform( plHandle, CLFFT_FORWARD, 1, &queue, 0, NULL, NULL, &bufB_in, &bufB_out, tmp_buf);

       

      The results received:

      1. Different for A & B
      2. Inconsistent between different runs.
      3. A_out[1] after reading to host != 0 (which I think should be)

       

      Is it something I may be doing wrong? Will be glad to get any comments.

       

      Thanks.