shithub: libvpx

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Added eob == 0 check to vp9_dequant_idct_add_32x32_c

Added a quick eob == 0 check.  Once the integer version of the dct32x32 is
complete, we can check for other eob cases.

For the 1080p clip used, the decoder performance improved by 4%.

Change-Id: I9390b6ed3c8be0c0c0a0c44c578d9a031d6e026e

--- a/vp9/decoder/vp9_dequantize.c

+++ b/vp9/decoder/vp9_dequantize.c

@@ -354,13 +354,15 @@

   int16_t output[1024];

   int i;

-  input[0]= input[0] * dq[0] / 2;

-  for (i = 1; i < 1024; i++)

-    input[i] = input[i] * dq[1] / 2;

-  vp9_short_idct32x32_c(input, output, 64);

-  vpx_memset(input, 0, 2048);

+  if (eob) {

+    input[0]= input[0] * dq[0] / 2;

+    for (i = 1; i < 1024; i++)

+      input[i] = input[i] * dq[1] / 2;

+    vp9_short_idct32x32_c(input, output, 64);

+    vpx_memset(input, 0, 2048);

-  add_residual(output, pred, pitch, dest, stride, 32, 32);

+    add_residual(output, pred, pitch, dest, stride, 32, 32);

+  }

 }

 void vp9_dequant_idct_add_uv_block_16x16_c(int16_t *q, const int16_t *dq,