1. 14 Dec, 2015 1 commit
    • Janne Grunau's avatar
      arm: add ff_int32_to_float_fmul_array8_neon · 90b1b935
      Janne Grunau authored
      Quite a bit faster than int32_to_float_fmul_array8_c calling
      ff_int32_to_float_fmul_scalar_neon through FmtConvertContext.
      Number of cycles per int32_to_float_fmul_array8 call while decoding
      padded.dts on exynos5422:
      
                     before  after   change
      cortex-a7:     1270     951    -25%
      cortex-a15:     434     285    -34%
      
      checkasm --bench cycle counts:     cortex-a15   cortex-a7
      int32_to_float_fmul_array8_c:      1730.4       4384.5
      int32_to_float_fmul_array8_neon_c:  571.5       1694.3
      int32_to_float_fmul_array8_neon:    374.0       1448.8
      
      Interesting are the differences between
      int32_to_float_fmul_array8_neon_c and int32_to_float_fmul_array8_neon.
      The former is current behaviour of calling
      ff_int32_to_float_fmul_scalar_neon repeatedly from the c function,
      The raw numbers differ since checkasm uses different lengths than the
      dca decoder.
      90b1b935
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