x86inc.asm
资源名称:X264CODEC.rar [点击查看]
上传用户:lctgjx
上传日期:2022-06-04
资源大小:8887k
文件大小:15k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- ;*****************************************************************************
- ;* x86inc.asm
- ;*****************************************************************************
- ;* Copyright (C) 2005-2008 x264 project
- ;*
- ;* Authors: Loren Merritt <lorenm@u.washington.edu>
- ;* Anton Mitrofanov <BugMaster@narod.ru>
- ;*
- ;* This program is free software; you can redistribute it and/or modify
- ;* it under the terms of the GNU General Public License as published by
- ;* the Free Software Foundation; either version 2 of the License, or
- ;* (at your option) any later version.
- ;*
- ;* This program is distributed in the hope that it will be useful,
- ;* but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;* GNU General Public License for more details.
- ;*
- ;* You should have received a copy of the GNU General Public License
- ;* along with this program; if not, write to the Free Software
- ;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
- ;*****************************************************************************
- %ifdef ARCH_X86_64
- %ifidn __OUTPUT_FORMAT__,win32
- %define WIN64
- %else
- %define UNIX64
- %endif
- %endif
- ; FIXME: All of the 64bit asm functions that take a stride as an argument
- ; via register, assume that the high dword of that register is filled with 0.
- ; This is true in practice (since we never do any 64bit arithmetic on strides,
- ; and x264's strides are all positive), but is not guaranteed by the ABI.
- ; Name of the .rodata section.
- ; Kludge: Something on OS X fails to align .rodata even given an align attribute,
- ; so use a different read-only section.
- %macro SECTION_RODATA 0-1 16
- %ifidn __OUTPUT_FORMAT__,macho64
- SECTION .text align=%1
- %elifidn __OUTPUT_FORMAT__,macho
- SECTION .text align=%1
- fakegot:
- %else
- SECTION .rodata align=%1
- %endif
- %endmacro
- ; PIC support macros.
- ; x86_64 can't fit 64bit address literals in most instruction types,
- ; so shared objects (under the assumption that they might be anywhere
- ; in memory) must use an address mode that does fit.
- ; So all accesses to global variables must use this macro, e.g.
- ; mov eax, [foo GLOBAL]
- ; instead of
- ; mov eax, [foo]
- ;
- ; x86_32 doesn't require PIC.
- ; Some distros prefer shared objects to be PIC, but nothing breaks if
- ; the code contains a few textrels, so we'll skip that complexity.
- %ifdef WIN64
- %define PIC
- %elifndef ARCH_X86_64
- %undef PIC
- %endif
- %ifdef PIC
- %define GLOBAL wrt rip
- %else
- %define GLOBAL
- %endif
- ; Macros to eliminate most code duplication between x86_32 and x86_64:
- ; Currently this works only for leaf functions which load all their arguments
- ; into registers at the start, and make no other use of the stack. Luckily that
- ; covers most of x264's asm.
- ; PROLOGUE:
- ; %1 = number of arguments. loads them from stack if needed.
- ; %2 = number of registers used. pushes callee-saved regs if needed.
- ; %3 = number of xmm registers used. pushes callee-saved xmm regs if needed.
- ; %4 = list of names to define to registers
- ; PROLOGUE can also be invoked by adding the same options to cglobal
- ; e.g.
- ; cglobal foo, 2,3, dst, src, tmp
- ; declares a function (foo), taking two args (dst and src) and one local variable (tmp)
- ; TODO Some functions can use some args directly from the stack. If they're the
- ; last args then you can just not declare them, but if they're in the middle
- ; we need more flexible macro.
- ; RET:
- ; Pops anything that was pushed by PROLOGUE
- ; REP_RET:
- ; Same, but if it doesn't pop anything it becomes a 2-byte ret, for athlons
- ; which are slow when a normal ret follows a branch.
- ; registers:
- ; rN and rNq are the native-size register holding function argument N
- ; rNd, rNw, rNb are dword, word, and byte size
- ; rNm is the original location of arg N (a register or on the stack), dword
- ; rNmp is native size
- %macro DECLARE_REG 6
- %define r%1q %2
- %define r%1d %3
- %define r%1w %4
- %define r%1b %5
- %define r%1m %6
- %ifid %6 ; i.e. it's a register
- %define r%1mp %2
- %elifdef ARCH_X86_64 ; memory
- %define r%1mp qword %6
- %else
- %define r%1mp dword %6
- %endif
- %define r%1 %2
- %endmacro
- %macro DECLARE_REG_SIZE 2
- %define r%1q r%1
- %define e%1q r%1
- %define r%1d e%1
- %define e%1d e%1
- %define r%1w %1
- %define e%1w %1
- %define r%1b %2
- %define e%1b %2
- %ifndef ARCH_X86_64
- %define r%1 e%1
- %endif
- %endmacro
- DECLARE_REG_SIZE ax, al
- DECLARE_REG_SIZE bx, bl
- DECLARE_REG_SIZE cx, cl
- DECLARE_REG_SIZE dx, dl
- DECLARE_REG_SIZE si, sil
- DECLARE_REG_SIZE di, dil
- DECLARE_REG_SIZE bp, bpl
- ; t# defines for when per-arch register allocation is more complex than just function arguments
- %macro DECLARE_REG_TMP 1-*
- %assign %%i 0
- %rep %0
- CAT_XDEFINE t, %%i, r%1
- %assign %%i %%i+1
- %rotate 1
- %endrep
- %endmacro
- %macro DECLARE_REG_TMP_SIZE 0-*
- %rep %0
- %define t%1q t%1 %+ q
- %define t%1d t%1 %+ d
- %define t%1w t%1 %+ w
- %define t%1b t%1 %+ b
- %rotate 1
- %endrep
- %endmacro
- DECLARE_REG_TMP_SIZE 0,1,2,3,4,5,6,7
- %ifdef ARCH_X86_64
- %define gprsize 8
- %else
- %define gprsize 4
- %endif
- %macro PUSH 1
- push %1
- %assign stack_offset stack_offset+gprsize
- %endmacro
- %macro POP 1
- pop %1
- %assign stack_offset stack_offset-gprsize
- %endmacro
- %macro SUB 2
- sub %1, %2
- %ifidn %1, rsp
- %assign stack_offset stack_offset+(%2)
- %endif
- %endmacro
- %macro ADD 2
- add %1, %2
- %ifidn %1, rsp
- %assign stack_offset stack_offset-(%2)
- %endif
- %endmacro
- %macro movifnidn 2
- %ifnidn %1, %2
- mov %1, %2
- %endif
- %endmacro
- %macro movsxdifnidn 2
- %ifnidn %1, %2
- movsxd %1, %2
- %endif
- %endmacro
- %macro ASSERT 1
- %if (%1) == 0
- %error assert failed
- %endif
- %endmacro
- %macro DEFINE_ARGS 0-*
- %ifdef n_arg_names
- %assign %%i 0
- %rep n_arg_names
- CAT_UNDEF arg_name %+ %%i, q
- CAT_UNDEF arg_name %+ %%i, d
- CAT_UNDEF arg_name %+ %%i, w
- CAT_UNDEF arg_name %+ %%i, b
- CAT_UNDEF arg_name, %%i
- %assign %%i %%i+1
- %endrep
- %endif
- %assign %%i 0
- %rep %0
- %xdefine %1q r %+ %%i %+ q
- %xdefine %1d r %+ %%i %+ d
- %xdefine %1w r %+ %%i %+ w
- %xdefine %1b r %+ %%i %+ b
- CAT_XDEFINE arg_name, %%i, %1
- %assign %%i %%i+1
- %rotate 1
- %endrep
- %assign n_arg_names %%i
- %endmacro
- %ifdef WIN64 ; Windows x64 ;=================================================
- DECLARE_REG 0, rcx, ecx, cx, cl, ecx
- DECLARE_REG 1, rdx, edx, dx, dl, edx
- DECLARE_REG 2, r8, r8d, r8w, r8b, r8d
- DECLARE_REG 3, r9, r9d, r9w, r9b, r9d
- DECLARE_REG 4, rdi, edi, di, dil, [rsp + stack_offset + 40]
- DECLARE_REG 5, rsi, esi, si, sil, [rsp + stack_offset + 48]
- DECLARE_REG 6, rax, eax, ax, al, [rsp + stack_offset + 56]
- %define r7m [rsp + stack_offset + 64]
- %define r8m [rsp + stack_offset + 72]
- %macro LOAD_IF_USED 2 ; reg_id, number_of_args
- %if %1 < %2
- mov r%1, [rsp + stack_offset + 8 + %1*8]
- %endif
- %endmacro
- %macro PROLOGUE 2-4+ ; #args, #regs, #xmm_regs, arg_names...
- ASSERT %2 >= %1
- %assign regs_used %2
- ASSERT regs_used <= 7
- %if %0 > 2
- %assign xmm_regs_used %3
- %else
- %assign xmm_regs_used 0
- %endif
- ASSERT xmm_regs_used <= 16
- %if regs_used > 4
- push r4
- push r5
- %assign stack_offset stack_offset+16
- %endif
- %if xmm_regs_used > 6
- sub rsp, (xmm_regs_used-6)*16+16
- %assign stack_offset stack_offset+(xmm_regs_used-6)*16+16
- %assign %%i xmm_regs_used
- %rep (xmm_regs_used-6)
- %assign %%i %%i-1
- movdqa [rsp + (%%i-6)*16+8], xmm %+ %%i
- %endrep
- %endif
- LOAD_IF_USED 4, %1
- LOAD_IF_USED 5, %1
- LOAD_IF_USED 6, %1
- DEFINE_ARGS %4
- %endmacro
- %macro RESTORE_XMM_INTERNAL 1
- %if xmm_regs_used > 6
- %assign %%i xmm_regs_used
- %rep (xmm_regs_used-6)
- %assign %%i %%i-1
- movdqa xmm %+ %%i, [%1 + (%%i-6)*16+8]
- %endrep
- add %1, (xmm_regs_used-6)*16+16
- %endif
- %endmacro
- %macro RESTORE_XMM 1
- RESTORE_XMM_INTERNAL %1
- %assign stack_offset stack_offset-(xmm_regs_used-6)*16+16
- %assign xmm_regs_used 0
- %endmacro
- %macro RET 0
- RESTORE_XMM_INTERNAL rsp
- %if regs_used > 4
- pop r5
- pop r4
- %endif
- ret
- %endmacro
- %macro REP_RET 0
- %if regs_used > 4 || xmm_regs_used > 6
- RET
- %else
- rep ret
- %endif
- %endmacro
- %elifdef ARCH_X86_64 ; *nix x64 ;=============================================
- DECLARE_REG 0, rdi, edi, di, dil, edi
- DECLARE_REG 1, rsi, esi, si, sil, esi
- DECLARE_REG 2, rdx, edx, dx, dl, edx
- DECLARE_REG 3, rcx, ecx, cx, cl, ecx
- DECLARE_REG 4, r8, r8d, r8w, r8b, r8d
- DECLARE_REG 5, r9, r9d, r9w, r9b, r9d
- DECLARE_REG 6, rax, eax, ax, al, [rsp + stack_offset + 8]
- %define r7m [rsp + stack_offset + 16]
- %define r8m [rsp + stack_offset + 24]
- %macro LOAD_IF_USED 2 ; reg_id, number_of_args
- %if %1 < %2
- mov r%1, [rsp - 40 + %1*8]
- %endif
- %endmacro
- %macro PROLOGUE 2-4+ ; #args, #regs, #xmm_regs, arg_names...
- ASSERT %2 >= %1
- ASSERT %2 <= 7
- LOAD_IF_USED 6, %1
- DEFINE_ARGS %4
- %endmacro
- %macro RET 0
- ret
- %endmacro
- %macro REP_RET 0
- rep ret
- %endmacro
- %else ; X86_32 ;==============================================================
- DECLARE_REG 0, eax, eax, ax, al, [esp + stack_offset + 4]
- DECLARE_REG 1, ecx, ecx, cx, cl, [esp + stack_offset + 8]
- DECLARE_REG 2, edx, edx, dx, dl, [esp + stack_offset + 12]
- DECLARE_REG 3, ebx, ebx, bx, bl, [esp + stack_offset + 16]
- DECLARE_REG 4, esi, esi, si, null, [esp + stack_offset + 20]
- DECLARE_REG 5, edi, edi, di, null, [esp + stack_offset + 24]
- DECLARE_REG 6, ebp, ebp, bp, null, [esp + stack_offset + 28]
- %define r7m [esp + stack_offset + 32]
- %define r8m [esp + stack_offset + 36]
- %define rsp esp
- %macro PUSH_IF_USED 1 ; reg_id
- %if %1 < regs_used
- push r%1
- %assign stack_offset stack_offset+4
- %endif
- %endmacro
- %macro POP_IF_USED 1 ; reg_id
- %if %1 < regs_used
- pop r%1
- %endif
- %endmacro
- %macro LOAD_IF_USED 2 ; reg_id, number_of_args
- %if %1 < %2
- mov r%1, [esp + stack_offset + 4 + %1*4]
- %endif
- %endmacro
- %macro PROLOGUE 2-4+ ; #args, #regs, arg_names...
- ASSERT %2 >= %1
- %assign regs_used %2
- ASSERT regs_used <= 7
- PUSH_IF_USED 3
- PUSH_IF_USED 4
- PUSH_IF_USED 5
- PUSH_IF_USED 6
- LOAD_IF_USED 0, %1
- LOAD_IF_USED 1, %1
- LOAD_IF_USED 2, %1
- LOAD_IF_USED 3, %1
- LOAD_IF_USED 4, %1
- LOAD_IF_USED 5, %1
- LOAD_IF_USED 6, %1
- DEFINE_ARGS %4
- %endmacro
- %macro RET 0
- POP_IF_USED 6
- POP_IF_USED 5
- POP_IF_USED 4
- POP_IF_USED 3
- ret
- %endmacro
- %macro REP_RET 0
- %if regs_used > 3
- RET
- %else
- rep ret
- %endif
- %endmacro
- %endif ;======================================================================
- ;=============================================================================
- ; arch-independent part
- ;=============================================================================
- %assign function_align 16
- ; Symbol prefix for C linkage
- %macro cglobal 1-2+
- %ifdef PREFIX
- %xdefine %1.skip_prologue _%1.skip_prologue
- %xdefine %1 _%1
- %endif
- %ifidn __OUTPUT_FORMAT__,elf
- global %1:function hidden
- %else
- global %1
- %endif
- align function_align
- %1:
- RESET_MM_PERMUTATION ; not really needed, but makes disassembly somewhat nicer
- %assign stack_offset 0
- %if %0 > 1
- PROLOGUE %2
- %endif
- %endmacro
- %macro cextern 1
- %ifdef PREFIX
- %xdefine %1 _%1
- %endif
- extern %1
- %endmacro
- ; This is needed for ELF, otherwise the GNU linker assumes the stack is
- ; executable by default.
- %ifidn __OUTPUT_FORMAT__,elf
- SECTION .note.GNU-stack noalloc noexec nowrite progbits
- %endif
- %assign FENC_STRIDE 16
- %assign FDEC_STRIDE 32
- ; merge mmx and sse*
- %macro CAT_XDEFINE 3
- %xdefine %1%2 %3
- %endmacro
- %macro CAT_UNDEF 2
- %undef %1%2
- %endmacro
- %macro INIT_MMX 0
- %define RESET_MM_PERMUTATION INIT_MMX
- %define mmsize 8
- %define num_mmregs 8
- %define mova movq
- %define movu movq
- %define movh movd
- %define movnt movntq
- %assign %%i 0
- %rep 8
- CAT_XDEFINE m, %%i, mm %+ %%i
- CAT_XDEFINE nmm, %%i, %%i
- %assign %%i %%i+1
- %endrep
- %rep 8
- CAT_UNDEF m, %%i
- CAT_UNDEF nmm, %%i
- %assign %%i %%i+1
- %endrep
- %endmacro
- %macro INIT_XMM 0
- %define RESET_MM_PERMUTATION INIT_XMM
- %define mmsize 16
- %define num_mmregs 8
- %ifdef ARCH_X86_64
- %define num_mmregs 16
- %endif
- %define mova movdqa
- %define movu movdqu
- %define movh movq
- %define movnt movntdq
- %assign %%i 0
- %rep num_mmregs
- CAT_XDEFINE m, %%i, xmm %+ %%i
- CAT_XDEFINE nxmm, %%i, %%i
- %assign %%i %%i+1
- %endrep
- %endmacro
- INIT_MMX
- ; I often want to use macros that permute their arguments. e.g. there's no
- ; efficient way to implement butterfly or transpose or dct without swapping some
- ; arguments.
- ;
- ; I would like to not have to manually keep track of the permutations:
- ; If I insert a permutation in the middle of a function, it should automatically
- ; change everything that follows. For more complex macros I may also have multiple
- ; implementations, e.g. the SSE2 and SSSE3 versions may have different permutations.
- ;
- ; Hence these macros. Insert a PERMUTE or some SWAPs at the end of a macro that
- ; permutes its arguments. It's equivalent to exchanging the contents of the
- ; registers, except that this way you exchange the register names instead, so it
- ; doesn't cost any cycles.
- %macro PERMUTE 2-* ; takes a list of pairs to swap
- %rep %0/2
- %xdefine tmp%2 m%2
- %xdefine ntmp%2 nm%2
- %rotate 2
- %endrep
- %rep %0/2
- %xdefine m%1 tmp%2
- %xdefine nm%1 ntmp%2
- %undef tmp%2
- %undef ntmp%2
- %rotate 2
- %endrep
- %endmacro
- %macro SWAP 2-* ; swaps a single chain (sometimes more concise than pairs)
- %rep %0-1
- %ifdef m%1
- %xdefine tmp m%1
- %xdefine m%1 m%2
- %xdefine m%2 tmp
- CAT_XDEFINE n, m%1, %1
- CAT_XDEFINE n, m%2, %2
- %else
- ; If we were called as "SWAP m0,m1" rather than "SWAP 0,1" infer the original numbers here.
- ; Be careful using this mode in nested macros though, as in some cases there may be
- ; other copies of m# that have already been dereferenced and don't get updated correctly.
- %xdefine %%n1 n %+ %1
- %xdefine %%n2 n %+ %2
- %xdefine tmp m %+ %%n1
- CAT_XDEFINE m, %%n1, m %+ %%n2
- CAT_XDEFINE m, %%n2, tmp
- CAT_XDEFINE n, m %+ %%n1, %%n1
- CAT_XDEFINE n, m %+ %%n2, %%n2
- %endif
- %undef tmp
- %rotate 1
- %endrep
- %endmacro
- %macro SAVE_MM_PERMUTATION 1
- %assign %%i 0
- %rep num_mmregs
- CAT_XDEFINE %1_m, %%i, m %+ %%i
- %assign %%i %%i+1
- %endrep
- %endmacro
- %macro LOAD_MM_PERMUTATION 1
- %assign %%i 0
- %rep num_mmregs
- CAT_XDEFINE m, %%i, %1_m %+ %%i
- CAT_XDEFINE n, m %+ %%i, %%i
- %assign %%i %%i+1
- %endrep
- %endmacro
- %macro call 1
- call %1
- %ifdef %1_m0
- LOAD_MM_PERMUTATION %1
- %endif
- %endmacro
- ;Substitutions that reduce instruction size but are functionally equivalent
- %macro add 2
- %ifnum %2
- %if %2==128
- sub %1, -128
- %else
- add %1, %2
- %endif
- %else
- add %1, %2
- %endif
- %endmacro
- %macro sub 2
- %ifnum %2
- %if %2==128
- add %1, -128
- %else
- sub %1, %2
- %endif
- %else
- sub %1, %2
- %endif
- %endmacro