Implements RGB to YV12 conversion in YASM.

media/base/simd/yuv_row.inc

Index: media/base/simd/yuv_row.inc
===================================================================
--- media/base/simd/yuv_row.inc	(revision 0)
+++ media/base/simd/yuv_row.inc	(revision 0)
@@ -0,0 +1,101 @@
+; Copyright (c) 2011 The Chromium Authors. All rights reserved.

[Alpha Left Google, 2011/08/22 14:16:59]

Rename this to yuv_row_common_sse2.inc, there might be a neon version.

+; Use of this source code is governed by a BSD-style license that can be
+; found in the LICENSE file.
+
+%ifndef MEDIA_BASE_SIMD_COMMON_INC_

[Alpha Left Google, 2011/08/22 14:16:59]

This should be MEDIA_BASE_YUV_ROW_COMMON_SSE2_INC_

+%define MEDIA_BASE_SIMD_COMMON_INC_
+
+%define EXTN(name)              name             ; foo() -> foo
+
+%ifdef MACHO
+%define PRIVATE                 :private_extern
+%elifdef ELF
+%define PRIVATE                 :hidden
+%else
+%define PRIVATE
+%endif
+
+%ifdef MACHO
+%define SEG_TEXT                .text   align=16
+%define SEG_CONST               .rodata align=16
+%elifdef ELF
+%ifdef __x86_64__
+%define SEG_TEXT                .text   progbits align=16
+%define SEG_CONST               .rodata progbits align=16
+%else
+%define SEG_TEXT                .text   progbits alloc exec   nowrite align=16
+%define SEG_CONST               .rodata progbits alloc noexec nowrite align=16
+%endif
+%elifdef MSVC
+%define SEG_TEXT                .text  align=16
+%define SEG_CONST               .rdata align=16
+%endif
+
+%define SIZEOF_BYTE             1               ; sizeof(BYTE)
+%define SIZEOF_WORD             2               ; sizeof(WORD)
+%define SIZEOF_DWORD            4               ; sizeof(DWORD)
+%define SIZEOF_QWORD            8               ; sizeof(QWORD)
+%define SIZEOF_DQWORD           16              ; sizeof(DQWORD)
+
+%ifdef __x86_64__
+%define POINTER                 qword           ; general pointer type
+%define SIZEOF_POINTER          SIZEOF_QWORD    ; sizeof(POINTER)
+%define POINTER_BIT             QWORD_BIT       ; sizeof(POINTER) * BYTE_BIT
+%else
+%define POINTER                 dword           ; general pointer type
+%define SIZEOF_POINTER          SIZEOF_DWORD    ; sizeof(POINTER)
+%define POINTER_BIT             DWORD_BIT       ; sizeof(POINTER) * BYTE_BIT
+%endif
+
+%define INT                     dword           ; signed integer type
+%define SIZEOF_INT              SIZEOF_DWORD    ; sizeof(INT)
+%define INT_BIT                 DWORD_BIT       ; sizeof(INT) * BYTE_BIT
+
+%define MMWORD                  qword           ; int64  (MMX register)
+%define SIZEOF_MMWORD           SIZEOF_QWORD    ; sizeof(MMWORD)
+%define MMWORD_BIT              QWORD_BIT       ; sizeof(MMWORD) * BYTE_BIT
+%define XMMWORD                                 ; int128 (SSE register)
+%define SIZEOF_XMMWORD          SIZEOF_DQWORD   ; sizeof(XMMWORD)
+%define XMMWORD_BIT             DQWORD_BIT      ; sizeof(XMMWORD) * BYTE_BIT
+
+; Aliases for x86 registers.
+%ifdef __x86_64__
+%define _EAX_                   rax
+%define _EBX_                   rbx
+%define _ECX_                   rcx
+%define _EDX_                   rdx
+%define _ESI_                   rsi
+%define _EDI_                   rdi
+%define _ESP_                   rsp
+%define _EBP_                   rbp
+%else
+%define _EAX_                   eax
+%define _EBX_                   ebx
+%define _ECX_                   ecx
+%define _EDX_                   edx
+%define _ESI_                   esi
+%define _EDI_                   edi
+%define _ESP_                   esp
+%define _EBP_                   ebp
+%endif
+
+; LOADSYM register, symbol
+; Copies the address to a local symbol to the specified register.

[Alpha Left Google, 2011/08/22 14:16:59]

Do a one liner to explain why we need to do this: because of PIC.

+%ifdef MACHO

[Alpha Left Google, 2011/08/22 14:16:59]

Both Linux and Mac uses PIC.

+; We create a PIC binary on Mac.
+%imacro LOADSYM 2
+  call      %%geteip
+  add       %1, %2 - $
+  jmp       %%end
+%%geteip:
+  mov       %1, POINTER [_ESP_]
+  ret
+%%end:
+%endmacro
+%else
+%imacro LOADSYM 2

[Alpha Left Google, 2011/08/22 14:16:59]

Do a one liner explanation here.

+  lea       %1, [%2]
+%endmacro
+%endif  ; MACHO
+
+%endif  ; MEDIA_BASE_SIMD_COMMON_INC_

[Alpha Left Google, 2011/08/22 14:16:59]

This one needs to change too.