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SSE2 inverse 4x4 2D-DCT with DC only

Add SSE2 implementation to handle the special case of inverse 2D-DCT
where only DC coefficient is non-zero.

Change-Id: I2c6a59e21e5e77b8cf39a4af5eecf4d5ade32e2f

--- a/vp9/common/vp9_rtcd_defs.sh

+++ b/vp9/common/vp9_rtcd_defs.sh

@@ -292,7 +292,7 @@

 # dct

 #

 prototype void vp9_short_idct4x4_1_add "int16_t *input, uint8_t *dest, int dest_stride"

-specialize vp9_short_idct4x4_1_add

+specialize vp9_short_idct4x4_1_add sse2

 prototype void vp9_short_idct4x4_add "int16_t *input, uint8_t *dest, int dest_stride"

 specialize vp9_short_idct4x4_add sse2

--- a/vp9/common/x86/vp9_idct_intrin_sse2.c

+++ b/vp9/common/x86/vp9_idct_intrin_sse2.c

@@ -148,6 +148,23 @@

   RECON_AND_STORE4X4(dest, input3);

 }

+void vp9_short_idct4x4_1_add_sse2(int16_t *input, uint8_t *dest, int stride) {

+  __m128i dc_value;

+  const __m128i zero = _mm_setzero_si128();

+  int a;

+

+  a = dct_const_round_shift(input[0] * cospi_16_64);

+  a = dct_const_round_shift(a * cospi_16_64);

+  a = ROUND_POWER_OF_TWO(a, 4);

+

+  dc_value = _mm_set1_epi16(a);

+

+  RECON_AND_STORE4X4(dest, dc_value);

+  RECON_AND_STORE4X4(dest, dc_value);

+  RECON_AND_STORE4X4(dest, dc_value);

+  RECON_AND_STORE4X4(dest, dc_value);

+}

+

 void vp9_idct4_1d_sse2(int16_t *input, int16_t *output) {

   const __m128i zero = _mm_setzero_si128();

   const __m128i c1 = _mm_setr_epi16((int16_t)cospi_16_64, (int16_t)cospi_16_64,