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546 lines
14 KiB
546 lines
14 KiB
;***************************************************************************** |
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;* x86inc.asm |
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;***************************************************************************** |
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;* Copyright (C) 2005-2008 Loren Merritt <lorenm@u.washington.edu> |
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;* |
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;* This file is part of FFmpeg. |
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;* |
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;* FFmpeg is free software; you can redistribute it and/or |
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;* modify it under the terms of the GNU Lesser General Public |
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;* License as published by the Free Software Foundation; either |
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;* version 2.1 of the License, or (at your option) any later version. |
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;* |
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;* FFmpeg is distributed in the hope that it will be useful, |
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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;* Lesser General Public License for more details. |
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;* |
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;* You should have received a copy of the GNU Lesser General Public |
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;* License along with FFmpeg; if not, write to the Free Software |
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;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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;***************************************************************************** |
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; FIXME: All of the 64bit asm functions that take a stride as an argument |
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; via register, assume that the high dword of that register is filled with 0. |
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; This is true in practice (since we never do any 64bit arithmetic on strides, |
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; and x264's strides are all positive), but is not guaranteed by the ABI. |
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; Name of the .rodata section. |
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; Kludge: Something on OS X fails to align .rodata even given an align attribute, |
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; so use a different read-only section. |
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%macro SECTION_RODATA 0 |
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%ifidn __OUTPUT_FORMAT__,macho64 |
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SECTION .text align=16 |
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%elifidn __OUTPUT_FORMAT__,macho |
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SECTION .text align=16 |
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fakegot: |
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%else |
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SECTION .rodata align=16 |
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%endif |
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%endmacro |
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; PIC support macros. All these macros are totally harmless when PIC is |
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; not defined but can ruin everything if misused in PIC mode. On x86_32, shared |
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; objects cannot directly access global variables by address, they need to |
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; go through the GOT (global offset table). Most OSes do not care about it |
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; and let you load non-shared .so objects (Linux, Win32...). However, OS X |
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; requires PIC code in its .dylib objects. |
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; |
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; - GLOBAL should be used as a suffix for global addressing, eg. |
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; picgetgot ebx |
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; mov eax, [foo GLOBAL] |
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; instead of |
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; mov eax, [foo] |
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; |
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; - picgetgot computes the GOT address into the given register in PIC |
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; mode, otherwise does nothing. You need to do this before using GLOBAL. |
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; Before in both execution order and compiled code order (so GLOBAL knows |
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; which register the GOT is in). |
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%ifndef PIC |
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%define GLOBAL |
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%macro picgetgot 1 |
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%endmacro |
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%elifdef ARCH_X86_64 |
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%define PIC64 |
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%define GLOBAL wrt rip |
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%macro picgetgot 1 |
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%endmacro |
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%else |
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%define PIC32 |
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%ifidn __OUTPUT_FORMAT__,macho |
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; There is no real global offset table on OS X, but we still |
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; need to reference our variables by offset. |
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%macro picgetgot 1 |
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call %%getgot |
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%%getgot: |
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pop %1 |
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add %1, $$ - %%getgot |
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%undef GLOBAL |
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%define GLOBAL + %1 - fakegot |
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%endmacro |
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%else ; elf |
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extern _GLOBAL_OFFSET_TABLE_ |
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%macro picgetgot 1 |
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call %%getgot |
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%%getgot: |
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pop %1 |
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add %1, _GLOBAL_OFFSET_TABLE_ + $$ - %%getgot wrt ..gotpc |
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%undef GLOBAL |
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%define GLOBAL + %1 wrt ..gotoff |
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%endmacro |
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%endif |
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%endif |
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; Macros to eliminate most code duplication between x86_32 and x86_64: |
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; Currently this works only for leaf functions which load all their arguments |
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; into registers at the start, and make no other use of the stack. Luckily that |
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; covers most of x264's asm. |
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; PROLOGUE: |
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; %1 = number of arguments. loads them from stack if needed. |
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; %2 = number of registers used, not including PIC. pushes callee-saved regs if needed. |
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; %3 = whether global constants are used in this function. inits x86_32 PIC if needed. |
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; %4 = list of names to define to registers |
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; PROLOGUE can also be invoked by adding the same options to cglobal |
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; e.g. |
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; cglobal foo, 2,3,0, dst, src, tmp |
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; declares a function (foo), taking two args (dst and src), one local variable (tmp), and not using globals |
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; TODO Some functions can use some args directly from the stack. If they're the |
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; last args then you can just not declare them, but if they're in the middle |
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; we need more flexible macro. |
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; RET: |
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; Pops anything that was pushed by PROLOGUE |
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; REP_RET: |
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; Same, but if it doesn't pop anything it becomes a 2-byte ret, for athlons |
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; which are slow when a normal ret follows a branch. |
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%macro DECLARE_REG 6 |
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%define r%1q %2 |
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%define r%1d %3 |
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%define r%1w %4 |
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%define r%1b %5 |
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%define r%1m %6 |
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%define r%1 %2 |
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%endmacro |
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%macro DECLARE_REG_SIZE 2 |
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%define r%1q r%1 |
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%define e%1q r%1 |
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%define r%1d e%1 |
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%define e%1d e%1 |
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%define r%1w %1 |
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%define e%1w %1 |
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%define r%1b %2 |
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%define e%1b %2 |
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%ifndef ARCH_X86_64 |
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%define r%1 e%1 |
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%endif |
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%endmacro |
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DECLARE_REG_SIZE ax, al |
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DECLARE_REG_SIZE bx, bl |
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DECLARE_REG_SIZE cx, cl |
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DECLARE_REG_SIZE dx, dl |
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DECLARE_REG_SIZE si, sil |
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DECLARE_REG_SIZE di, dil |
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DECLARE_REG_SIZE bp, bpl |
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%ifdef ARCH_X86_64 |
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%define gprsize 8 |
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%else |
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%define gprsize 4 |
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%endif |
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%macro PUSH 1 |
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push %1 |
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%assign stack_offset stack_offset+gprsize |
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%endmacro |
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%macro POP 1 |
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pop %1 |
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%assign stack_offset stack_offset-gprsize |
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%endmacro |
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%macro SUB 2 |
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sub %1, %2 |
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%ifidn %1, rsp |
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%assign stack_offset stack_offset+(%2) |
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%endif |
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%endmacro |
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%macro ADD 2 |
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add %1, %2 |
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%ifidn %1, rsp |
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%assign stack_offset stack_offset-(%2) |
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%endif |
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%endmacro |
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%macro movifnidn 2 |
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%ifnidn %1, %2 |
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mov %1, %2 |
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%endif |
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%endmacro |
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%macro movsxdifnidn 2 |
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%ifnidn %1, %2 |
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movsxd %1, %2 |
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%endif |
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%endmacro |
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%macro ASSERT 1 |
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%if (%1) == 0 |
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%error assert failed |
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%endif |
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%endmacro |
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%macro DEFINE_ARGS 0-* |
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%ifdef n_arg_names |
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%assign %%i 0 |
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%rep n_arg_names |
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CAT_UNDEF arg_name %+ %%i, q |
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CAT_UNDEF arg_name %+ %%i, d |
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CAT_UNDEF arg_name %+ %%i, w |
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CAT_UNDEF arg_name %+ %%i, b |
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CAT_UNDEF arg_name, %%i |
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%assign %%i %%i+1 |
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%endrep |
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%endif |
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%assign %%i 0 |
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%rep %0 |
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%xdefine %1q r %+ %%i %+ q |
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%xdefine %1d r %+ %%i %+ d |
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%xdefine %1w r %+ %%i %+ w |
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%xdefine %1b r %+ %%i %+ b |
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CAT_XDEFINE arg_name, %%i, %1 |
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%assign %%i %%i+1 |
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%rotate 1 |
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%endrep |
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%assign n_arg_names %%i |
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%endmacro |
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%ifdef ARCH_X86_64 ;========================================================== |
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%ifidn __OUTPUT_FORMAT__,win32 |
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DECLARE_REG 0, rcx, ecx, cx, cl, ecx |
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DECLARE_REG 1, rdx, edx, dx, dl, edx |
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DECLARE_REG 2, r8, r8d, r8w, r8b, r8d |
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DECLARE_REG 3, r9, r9d, r9w, r9b, r9d |
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DECLARE_REG 4, rdi, edi, di, dil, [rsp + stack_offset + 40] |
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DECLARE_REG 5, rsi, esi, si, sil, [rsp + stack_offset + 48] |
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DECLARE_REG 6, rax, eax, ax, al, [rsp + stack_offset + 56] |
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%define r7m [rsp + stack_offset + 64] |
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%define r8m [rsp + stack_offset + 72] |
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%macro LOAD_IF_USED 2 ; reg_id, number_of_args |
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%if %1 < %2 |
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mov r%1, [rsp + 8 + %1*8] |
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%endif |
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%endmacro |
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%else ;======================================================================= |
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DECLARE_REG 0, rdi, edi, di, dil, edi |
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DECLARE_REG 1, rsi, esi, si, sil, esi |
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DECLARE_REG 2, rdx, edx, dx, dl, edx |
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DECLARE_REG 3, rcx, ecx, cx, cl, ecx |
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DECLARE_REG 4, r8, r8d, r8w, r8b, r8d |
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DECLARE_REG 5, r9, r9d, r9w, r9b, r9d |
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DECLARE_REG 6, rax, eax, ax, al, [rsp + stack_offset + 8] |
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%define r7m [rsp + stack_offset + 16] |
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%define r8m [rsp + stack_offset + 24] |
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%macro LOAD_IF_USED 2 ; reg_id, number_of_args |
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%if %1 < %2 |
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mov r%1, [rsp - 40 + %1*8] |
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%endif |
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%endmacro |
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%endif ; !WIN64 |
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%macro PROLOGUE 2-4+ 0 ; #args, #regs, pic, arg_names... |
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ASSERT %2 >= %1 |
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ASSERT %2 <= 7 |
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%assign stack_offset 0 |
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%ifidn __OUTPUT_FORMAT__,win32 |
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LOAD_IF_USED 4, %1 |
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LOAD_IF_USED 5, %1 |
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%endif |
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LOAD_IF_USED 6, %1 |
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DEFINE_ARGS %4 |
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%endmacro |
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%macro RET 0 |
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ret |
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%endmacro |
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%macro REP_RET 0 |
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rep ret |
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%endmacro |
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%else ; X86_32 ;============================================================== |
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DECLARE_REG 0, eax, eax, ax, al, [esp + stack_offset + 4] |
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DECLARE_REG 1, ecx, ecx, cx, cl, [esp + stack_offset + 8] |
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DECLARE_REG 2, edx, edx, dx, dl, [esp + stack_offset + 12] |
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DECLARE_REG 3, ebx, ebx, bx, bl, [esp + stack_offset + 16] |
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DECLARE_REG 4, esi, esi, si, null, [esp + stack_offset + 20] |
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DECLARE_REG 5, edi, edi, di, null, [esp + stack_offset + 24] |
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DECLARE_REG 6, ebp, ebp, bp, null, [esp + stack_offset + 28] |
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%define r7m [esp + stack_offset + 32] |
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%define r8m [esp + stack_offset + 36] |
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%define rsp esp |
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%macro PUSH_IF_USED 1 ; reg_id |
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%if %1 < regs_used |
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push r%1 |
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%assign stack_offset stack_offset+4 |
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%endif |
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%endmacro |
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%macro POP_IF_USED 1 ; reg_id |
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%if %1 < regs_used |
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pop r%1 |
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%endif |
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%endmacro |
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%macro LOAD_IF_USED 2 ; reg_id, number_of_args |
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%if %1 < %2 |
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mov r%1, [esp + stack_offset + 4 + %1*4] |
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%endif |
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%endmacro |
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%macro PROLOGUE 2-4+ 0 ; #args, #regs, pic, arg_names... |
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ASSERT %2 >= %1 |
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%assign stack_offset 0 |
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%assign regs_used %2 |
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%ifdef PIC |
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%if %3 |
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%assign regs_used regs_used+1 |
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%endif |
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%endif |
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ASSERT regs_used <= 7 |
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PUSH_IF_USED 3 |
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PUSH_IF_USED 4 |
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PUSH_IF_USED 5 |
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PUSH_IF_USED 6 |
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LOAD_IF_USED 0, %1 |
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LOAD_IF_USED 1, %1 |
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LOAD_IF_USED 2, %1 |
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LOAD_IF_USED 3, %1 |
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LOAD_IF_USED 4, %1 |
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LOAD_IF_USED 5, %1 |
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LOAD_IF_USED 6, %1 |
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%if %3 |
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picgetgot r%2 |
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%endif |
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DEFINE_ARGS %4 |
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%endmacro |
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%macro RET 0 |
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POP_IF_USED 6 |
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POP_IF_USED 5 |
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POP_IF_USED 4 |
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POP_IF_USED 3 |
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ret |
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%endmacro |
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%macro REP_RET 0 |
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%if regs_used > 3 |
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RET |
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%else |
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rep ret |
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%endif |
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%endmacro |
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%endif ;====================================================================== |
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;============================================================================= |
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; arch-independent part |
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;============================================================================= |
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%assign function_align 16 |
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; Symbol prefix for C linkage |
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%macro cglobal 1-2+ |
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%ifidn __OUTPUT_FORMAT__,elf |
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%ifdef PREFIX |
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global _%1:function hidden |
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%define %1 _%1 |
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%else |
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global %1:function hidden |
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%endif |
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%else |
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%ifdef PREFIX |
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global _%1 |
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%define %1 _%1 |
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%else |
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global %1 |
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%endif |
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%endif |
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align function_align |
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%1: |
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RESET_MM_PERMUTATION ; not really needed, but makes disassembly somewhat nicer |
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%if %0 > 1 |
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PROLOGUE %2 |
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%endif |
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%endmacro |
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%macro cextern 1 |
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%ifdef PREFIX |
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extern _%1 |
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%define %1 _%1 |
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%else |
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extern %1 |
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%endif |
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%endmacro |
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; This is needed for ELF, otherwise the GNU linker assumes the stack is |
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; executable by default. |
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%ifidn __OUTPUT_FORMAT__,elf |
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SECTION .note.GNU-stack noalloc noexec nowrite progbits |
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%endif |
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%assign FENC_STRIDE 16 |
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%assign FDEC_STRIDE 32 |
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; merge mmx and sse* |
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%macro CAT_XDEFINE 3 |
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%xdefine %1%2 %3 |
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%endmacro |
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%macro CAT_UNDEF 2 |
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%undef %1%2 |
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%endmacro |
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%macro INIT_MMX 0 |
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%define RESET_MM_PERMUTATION INIT_MMX |
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%define mmsize 8 |
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%define num_mmregs 8 |
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%define mova movq |
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%define movu movq |
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%define movh movd |
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%define movnt movntq |
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%assign %%i 0 |
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%rep 8 |
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CAT_XDEFINE m, %%i, mm %+ %%i |
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CAT_XDEFINE nmm, %%i, %%i |
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%assign %%i %%i+1 |
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%endrep |
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%rep 8 |
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CAT_UNDEF m, %%i |
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CAT_UNDEF nmm, %%i |
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%assign %%i %%i+1 |
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%endrep |
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%endmacro |
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%macro INIT_XMM 0 |
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%define RESET_MM_PERMUTATION INIT_XMM |
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%define mmsize 16 |
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%define num_mmregs 8 |
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%ifdef ARCH_X86_64 |
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%define num_mmregs 16 |
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%endif |
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%define mova movdqa |
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%define movu movdqu |
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%define movh movq |
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%define movnt movntdq |
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%assign %%i 0 |
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%rep num_mmregs |
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CAT_XDEFINE m, %%i, xmm %+ %%i |
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CAT_XDEFINE nxmm, %%i, %%i |
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%assign %%i %%i+1 |
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%endrep |
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%endmacro |
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INIT_MMX |
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; I often want to use macros that permute their arguments. e.g. there's no |
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; efficient way to implement butterfly or transpose or dct without swapping some |
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; arguments. |
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; |
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; I would like to not have to manually keep track of the permutations: |
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; If I insert a permutation in the middle of a function, it should automatically |
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; change everything that follows. For more complex macros I may also have multiple |
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; implementations, e.g. the SSE2 and SSSE3 versions may have different permutations. |
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; |
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; Hence these macros. Insert a PERMUTE or some SWAPs at the end of a macro that |
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; permutes its arguments. It's equivalent to exchanging the contents of the |
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; registers, except that this way you exchange the register names instead, so it |
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; doesn't cost any cycles. |
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%macro PERMUTE 2-* ; takes a list of pairs to swap |
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%rep %0/2 |
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%xdefine tmp%2 m%2 |
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%xdefine ntmp%2 nm%2 |
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%rotate 2 |
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%endrep |
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%rep %0/2 |
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%xdefine m%1 tmp%2 |
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%xdefine nm%1 ntmp%2 |
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%undef tmp%2 |
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%undef ntmp%2 |
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%rotate 2 |
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%endrep |
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%endmacro |
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%macro SWAP 2-* ; swaps a single chain (sometimes more concise than pairs) |
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%rep %0-1 |
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%ifdef m%1 |
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%xdefine tmp m%1 |
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%xdefine m%1 m%2 |
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%xdefine m%2 tmp |
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CAT_XDEFINE n, m%1, %1 |
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CAT_XDEFINE n, m%2, %2 |
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%else |
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; If we were called as "SWAP m0,m1" rather than "SWAP 0,1" infer the original numbers here. |
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; Be careful using this mode in nested macros though, as in some cases there may be |
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; other copies of m# that have already been dereferenced and don't get updated correctly. |
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%xdefine %%n1 n %+ %1 |
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%xdefine %%n2 n %+ %2 |
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%xdefine tmp m %+ %%n1 |
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CAT_XDEFINE m, %%n1, m %+ %%n2 |
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CAT_XDEFINE m, %%n2, tmp |
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CAT_XDEFINE n, m %+ %%n1, %%n1 |
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CAT_XDEFINE n, m %+ %%n2, %%n2 |
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%endif |
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%undef tmp |
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%rotate 1 |
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%endrep |
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%endmacro |
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%macro SAVE_MM_PERMUTATION 1 |
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%assign %%i 0 |
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%rep num_mmregs |
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CAT_XDEFINE %1_m, %%i, m %+ %%i |
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%assign %%i %%i+1 |
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%endrep |
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%endmacro |
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%macro LOAD_MM_PERMUTATION 1 |
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%assign %%i 0 |
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%rep num_mmregs |
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CAT_XDEFINE m, %%i, %1_m %+ %%i |
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%assign %%i %%i+1 |
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%endrep |
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%endmacro |
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%macro call 1 |
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call %1 |
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%ifdef %1_m0 |
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LOAD_MM_PERMUTATION %1 |
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%endif |
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%endmacro |
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; substitutions which are functionally identical but reduce code size |
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%define movdqa movaps |
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%define movdqu movups |
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