tree 63c89429243de5a3a22e73578abc1649aa33aebc
parent 46929634257f291aa7be5cc46606509cec0ed9a1
author Peng Bin <binpengsmail@gmail.com> 1519903313 +0800
committer Bin Peng <binpengsmail@gmail.com> 1520304877 +0000

Refactor inv txfm ssse3 for tx_type with identity

Add dedicate functions for inv txfm include identity type.
lowbd_inv_txfm2d_add_{idtx,h_identity,v_identity}_ssse3
These functions are faster then the general one, for saving
a lot instructions by dropping transpose and dropping
some load or store operations.

The unittest shows this CL is 1.9x ~ 7.0x faster for those
inv txfm include identity type.
* 2.3x ~ 7.0x tx_size (64x64, 64x32, 32x64)
* 1.9x ~ 3.1x other cases

Change-Id: Ib8b0341c25088b5d424a52901853db198343279f