diff options
author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-12-09 04:12:38 +0400 |
---|---|---|
committer | Michael Niedermayer <michaelni@gmx.at> | 2012-12-12 13:37:52 +0400 |
commit | ce58642ed0d6dade63ff1b2467aa573e97c0cc91 (patch) | |
tree | 5911ccf44159f032015e875a4bc7d11c1dd80381 /libavutil | |
parent | 82c0211213430a9aef0d6ef5b29de35043f5bcba (diff) |
x86inc: support stack mem allocation and re-alignment in PROLOGUE.
Use this in VP8/H264-8bit loopfilter functions so they can be used if
there is no aligned stack (e.g. MSVC 32bit or ICC 10.x).
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'libavutil')
-rw-r--r-- | libavutil/x86/x86inc.asm | 185 |
1 files changed, 149 insertions, 36 deletions
diff --git a/libavutil/x86/x86inc.asm b/libavutil/x86/x86inc.asm index 8bdba6ec28..55bbbca267 100644 --- a/libavutil/x86/x86inc.asm +++ b/libavutil/x86/x86inc.asm @@ -130,7 +130,12 @@ CPUNOP amdnop ; %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 +; %4 = (optional) stack size to be allocated. If not aligned (x86-32 ICC 10.x, +; MSVC or YMM), the stack will be manually aligned (to 16 or 32 bytes), +; and an extra register will be allocated to hold the original stack +; pointer (to not invalidate r0m etc.). To prevent the use of an extra +; register as stack pointer, request a negative stack size. +; %4+/%5+ = list of names to define to registers ; PROLOGUE can also be invoked by adding the same options to cglobal ; e.g. @@ -166,11 +171,11 @@ CPUNOP amdnop %define r%1m %2d %define r%1mp %2 %elif ARCH_X86_64 ; memory - %define r%1m [rsp + stack_offset + %3] - %define r%1mp qword r %+ %1 %+ m + %define r%1m [rstk + stack_offset + %3] + %define r%1mp qword r %+ %1m %else - %define r%1m [esp + stack_offset + %3] - %define r%1mp dword r %+ %1 %+ m + %define r%1m [rstk + stack_offset + %3] + %define r%1mp dword r %+ %1m %endif %define r%1 %2 %endmacro @@ -231,12 +236,16 @@ DECLARE_REG_TMP_SIZE 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14 %macro PUSH 1 push %1 - %assign stack_offset stack_offset+gprsize + %ifidn rstk, rsp + %assign stack_offset stack_offset+gprsize + %endif %endmacro %macro POP 1 pop %1 - %assign stack_offset stack_offset-gprsize + %ifidn rstk, rsp + %assign stack_offset stack_offset-gprsize + %endif %endmacro %macro PUSH_IF_USED 1-* @@ -268,14 +277,14 @@ DECLARE_REG_TMP_SIZE 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14 %macro SUB 2 sub %1, %2 - %ifidn %1, rsp + %ifidn %1, rstk %assign stack_offset stack_offset+(%2) %endif %endmacro %macro ADD 2 add %1, %2 - %ifidn %1, rsp + %ifidn %1, rstk %assign stack_offset stack_offset-(%2) %endif %endmacro @@ -333,6 +342,73 @@ DECLARE_REG_TMP_SIZE 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14 %assign n_arg_names %0 %endmacro +%macro ALLOC_STACK 1-2 0 ; stack_size, n_xmm_regs (for win64 only) + %ifnum %1 + %if %1 != 0 + %assign %%stack_alignment ((mmsize + 15) & ~15) + %assign stack_size %1 + %if stack_size < 0 + %assign stack_size -stack_size + %endif + %assign xmm_regs_used %2 + %if mmsize <= 16 && HAVE_ALIGNED_STACK + %assign stack_size_padded stack_size + %%stack_alignment - gprsize - (stack_offset & (%%stack_alignment - 1)) + %if xmm_regs_used > 6 + %assign stack_size_padded stack_size_padded + (xmm_regs_used - 6) * 16 + %endif + SUB rsp, stack_size_padded + %else + %assign reg_num (regs_used - 1) + %xdefine rstk r %+ reg_num + ; align stack, and save original stack location directly above + ; it, i.e. in [rsp+stack_size_padded], so we can restore the + ; stack in a single instruction (i.e. mov rsp, rstk or mov + ; rsp, [rsp+stack_size_padded]) + mov rstk, rsp + %assign stack_size_padded stack_size + %if xmm_regs_used > 6 + %assign stack_size_padded stack_size_padded + (xmm_regs_used - 6) * 16 + %endif + %if %1 < 0 ; need to store rsp on stack + sub rsp, gprsize+stack_size_padded + and rsp, ~(%%stack_alignment-1) + %xdefine rstkm [rsp+stack_size_padded] + mov rstkm, rstk + %else ; can keep rsp in rstk during whole function + sub rsp, stack_size_padded + and rsp, ~(%%stack_alignment-1) + %xdefine rstkm rstk + %endif + %endif + %if xmm_regs_used > 6 + WIN64_PUSH_XMM + %endif + %endif + %endif +%endmacro + +%macro SETUP_STACK_POINTER 1 + %ifnum %1 + %if %1 != 0 && (HAVE_ALIGNED_STACK == 0 || mmsize == 32) + %if %1 > 0 + %assign regs_used (regs_used + 1) + %elif ARCH_X86_64 && regs_used == num_args && num_args <= 4 + UNIX64 * 2 + %warning "Stack pointer will overwrite register argument" + %endif + %endif + %endif +%endmacro + +%macro DEFINE_ARGS_INTERNAL 3+ + %ifnum %2 + DEFINE_ARGS %3 + %elif %1 == 4 + DEFINE_ARGS %2 + %elif %1 > 4 + DEFINE_ARGS %2, %3 + %endif +%endmacro + %if WIN64 ; Windows x64 ;================================================= DECLARE_REG 0, rcx @@ -351,31 +427,37 @@ DECLARE_REG 12, R13, 104 DECLARE_REG 13, R14, 112 DECLARE_REG 14, R15, 120 -%macro PROLOGUE 2-4+ 0 ; #args, #regs, #xmm_regs, arg_names... +%macro PROLOGUE 2-5+ 0 ; #args, #regs, #xmm_regs, [stack_size,] arg_names... %assign num_args %1 %assign regs_used %2 + SETUP_STACK_POINTER %4 ASSERT regs_used >= num_args ASSERT regs_used <= 15 PUSH_IF_USED 7, 8, 9, 10, 11, 12, 13, 14 - %if mmsize == 8 - %assign xmm_regs_used 0 - %else + %assign xmm_regs_used 0 + ALLOC_STACK %4, %3 + %if mmsize != 8 && stack_size == 0 WIN64_SPILL_XMM %3 %endif LOAD_IF_USED 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 - DEFINE_ARGS %4 + DEFINE_ARGS_INTERNAL %0, %4, %5 +%endmacro + +%macro WIN64_PUSH_XMM 0 + %assign %%i xmm_regs_used + %rep (xmm_regs_used-6) + %assign %%i %%i-1 + movdqa [rsp + (%%i-6)*16 + stack_size], xmm %+ %%i + %endrep %endmacro %macro WIN64_SPILL_XMM 1 %assign xmm_regs_used %1 ASSERT xmm_regs_used <= 16 %if xmm_regs_used > 6 - SUB rsp, (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+(~stack_offset&8)], xmm %+ %%i - %endrep + %assign stack_size_padded (xmm_regs_used-6)*16+16-gprsize-(stack_offset&15) + SUB rsp, stack_size_padded + WIN64_PUSH_XMM %endif %endmacro @@ -384,19 +466,25 @@ DECLARE_REG 14, R15, 120 %assign %%i xmm_regs_used %rep (xmm_regs_used-6) %assign %%i %%i-1 - movdqa xmm %+ %%i, [%1 + (%%i-6)*16+(~stack_offset&8)] + movdqa xmm %+ %%i, [%1 + (%%i-6)*16+stack_size] %endrep - add %1, (xmm_regs_used-6)*16+16 + %endif + %if stack_size_padded > 0 + %if stack_size > 0 && (mmsize == 32 || HAVE_ALIGNED_STACK == 0) + mov rsp, rstkm + %else + add %1, stack_size_padded + %endif %endif %endmacro %macro WIN64_RESTORE_XMM 1 WIN64_RESTORE_XMM_INTERNAL %1 - %assign stack_offset stack_offset-(xmm_regs_used-6)*16+16 + %assign stack_offset (stack_offset-stack_size_padded) %assign xmm_regs_used 0 %endmacro -%define has_epilogue regs_used > 7 || xmm_regs_used > 6 || mmsize == 32 +%define has_epilogue regs_used > 7 || xmm_regs_used > 6 || mmsize == 32 || stack_size > 0 %macro RET 0 WIN64_RESTORE_XMM_INTERNAL rsp @@ -425,19 +513,28 @@ DECLARE_REG 12, R13, 56 DECLARE_REG 13, R14, 64 DECLARE_REG 14, R15, 72 -%macro PROLOGUE 2-4+ ; #args, #regs, #xmm_regs, arg_names... +%macro PROLOGUE 2-5+ ; #args, #regs, #xmm_regs, [stack_size,] arg_names... %assign num_args %1 %assign regs_used %2 + SETUP_STACK_POINTER %4 ASSERT regs_used >= num_args ASSERT regs_used <= 15 PUSH_IF_USED 9, 10, 11, 12, 13, 14 + ALLOC_STACK %4 LOAD_IF_USED 6, 7, 8, 9, 10, 11, 12, 13, 14 - DEFINE_ARGS %4 + DEFINE_ARGS_INTERNAL %0, %4, %5 %endmacro -%define has_epilogue regs_used > 9 || mmsize == 32 +%define has_epilogue regs_used > 9 || mmsize == 32 || stack_size > 0 %macro RET 0 +%if stack_size_padded > 0 +%if mmsize == 32 || HAVE_ALIGNED_STACK == 0 + mov rsp, rstkm +%else + add rsp, stack_size_padded +%endif +%endif POP_IF_USED 14, 13, 12, 11, 10, 9 %if mmsize == 32 vzeroupper @@ -458,7 +555,7 @@ DECLARE_REG 6, ebp, 28 %macro DECLARE_ARG 1-* %rep %0 - %define r%1m [esp + stack_offset + 4*%1 + 4] + %define r%1m [rstk + stack_offset + 4*%1 + 4] %define r%1mp dword r%1m %rotate 1 %endrep @@ -466,24 +563,31 @@ DECLARE_REG 6, ebp, 28 DECLARE_ARG 7, 8, 9, 10, 11, 12, 13, 14 -%macro PROLOGUE 2-4+ ; #args, #regs, #xmm_regs, arg_names... +%macro PROLOGUE 2-5+ ; #args, #regs, #xmm_regs, [stack_size,] arg_names... %assign num_args %1 %assign regs_used %2 - %if num_args > 7 - %assign num_args 7 - %endif %if regs_used > 7 %assign regs_used 7 %endif + SETUP_STACK_POINTER %4 + ASSERT regs_used <= 7 ASSERT regs_used >= num_args PUSH_IF_USED 3, 4, 5, 6 + ALLOC_STACK %4 LOAD_IF_USED 0, 1, 2, 3, 4, 5, 6 - DEFINE_ARGS %4 + DEFINE_ARGS_INTERNAL %0, %4, %5 %endmacro -%define has_epilogue regs_used > 3 || mmsize == 32 +%define has_epilogue regs_used > 3 || mmsize == 32 || stack_size > 0 %macro RET 0 +%if stack_size_padded > 0 +%if mmsize == 32 || HAVE_ALIGNED_STACK == 0 + mov rsp, rstkm +%else + add rsp, stack_size_padded +%endif +%endif POP_IF_USED 6, 5, 4, 3 %if mmsize == 32 vzeroupper @@ -498,6 +602,8 @@ DECLARE_ARG 7, 8, 9, 10, 11, 12, 13, 14 %endmacro %macro WIN64_RESTORE_XMM 1 %endmacro +%macro WIN64_PUSH_XMM 0 +%endmacro %endif %macro REP_RET 0 @@ -527,8 +633,12 @@ DECLARE_ARG 7, 8, 9, 10, 11, 12, 13, 14 ; Applies any symbol mangling needed for C linkage, and sets up a define such that ; subsequent uses of the function name automatically refer to the mangled version. ; Appends cpuflags to the function name if cpuflags has been specified. -%macro cglobal 1-2+ "" ; name, [PROLOGUE args] +%macro cglobal 1-2+ ; name, [PROLOGUE args] +%if %0 == 1 + cglobal_internal %1 %+ SUFFIX +%else cglobal_internal %1 %+ SUFFIX, %2 +%endif %endmacro %macro cglobal_internal 1-2+ %ifndef cglobaled_%1 @@ -545,8 +655,11 @@ DECLARE_ARG 7, 8, 9, 10, 11, 12, 13, 14 align function_align %1: RESET_MM_PERMUTATION ; not really needed, but makes disassembly somewhat nicer + %xdefine rstk rsp %assign stack_offset 0 - %ifnidn %2, "" + %assign stack_size 0 + %assign stack_size_padded 0 + %if %0 > 1 PROLOGUE %2 %endif %endmacro |