libvpx: Pull from upstream

source/libvpx/third_party/x86inc/x86inc.asm

 ;*****************************************************************************
 ;* x86inc.asm: x264asm abstraction layer
 ;*****************************************************************************
 ;* Copyright (C) 2005-2012 x264 project
 ;*
 ;* Authors: Loren Merritt <lorenm@u.washington.edu>
 ;*          Anton Mitrofanov <BugMaster@narod.ru>
 ;*          Jason Garrett-Glaser <darkshikari@gmail.com>
 ;*          Henrik Gramner <hengar-6@student.ltu.se>
 ;*
@@ skipping 377 matching lines @@
         %xdefine %1m r %+ %%i %+ m
         %xdefine %1mp r %+ %%i %+ mp
         CAT_XDEFINE arg_name, %%i, %1
         %assign %%i %%i+1
         %rotate 1
     %endrep
     %xdefine stack_offset %%stack_offset
     %assign n_arg_names %0
 %endmacro
 
+%if ARCH_X86_64
+%macro ALLOC_STACK 2  ; stack_size, num_regs
+  %assign %%stack_aligment ((mmsize + 15) & ~15)
+  %assign stack_size_padded %1
+
+  %assign %%reg_num (%2 - 1)
+  %xdefine rsp_tmp r %+ %%reg_num
+  mov  rsp_tmp, rsp
+  sub  rsp, stack_size_padded
+  and  rsp, ~(%%stack_aligment - 1)
+%endmacro
+
+%macro RESTORE_STACK 0  ; reset rsp register
+  mov  rsp, rsp_tmp
+%endmacro
+%endif
+
 %if WIN64 ; Windows x64 ;=================================================
 
 DECLARE_REG 0,  rcx, ecx,  cx,   cl
 DECLARE_REG 1,  rdx, edx,  dx,   dl
 DECLARE_REG 2,  R8,  R8D,  R8W,  R8B
 DECLARE_REG 3,  R9,  R9D,  R9W,  R9B
 DECLARE_REG 4,  R10, R10D, R10W, R10B, 40
 DECLARE_REG 5,  R11, R11D, R11W, R11B, 48
 DECLARE_REG 6,  rax, eax,  ax,   al,   56
 DECLARE_REG 7,  rdi, edi,  di,   dil,  64
@@ skipping 786 matching lines @@
         %else
             %6 %1, %2, %3
             %7 %1, %4
         %endif
     %endmacro
 %endmacro
 
 FMA_INSTR  pmacsdd,  pmulld, paddd
 FMA_INSTR  pmacsww,  pmullw, paddw
 FMA_INSTR pmadcswd, pmaddwd, paddd