[FFmpeg-cvslog] x86: lavr: use the x86inc.asm automatic stack alignment in mixing functions

[Justin Ruggles]

ffmpeg | branch: release/1.1 | Justin Ruggles <justin.ruggles at gmail.com> | Wed Jan  2 13:34:48 2013 -0500| [a55700541756022043075975bca6a0b7376595b7] | committer: Reinhard Tartler

x86: lavr: use the x86inc.asm automatic stack alignment in mixing functions

CC:libav-stable at libav.org
(cherry picked from commit 95d01c3f1c33c079db04e24133ba4a6b00d62d4a)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a55700541756022043075975bca6a0b7376595b7
---

 libavresample/x86/audio_mix.asm |   35 +++++++++--------------------------
 1 file changed, 9 insertions(+), 26 deletions(-)

diff --git a/libavresample/x86/audio_mix.asm b/libavresample/x86/audio_mix.asm
index daf0a7b..8a298e2 100644
--- a/libavresample/x86/audio_mix.asm
+++ b/libavresample/x86/audio_mix.asm
@@ -260,29 +260,20 @@ MIX_1_TO_2_S16P_FLT
 %else
     %assign matrix_elements_stack 0
 %endif
+%assign matrix_stack_size matrix_elements_stack * mmsize
 
-cglobal mix_%1_to_%2_%3_flt, 3,in_channels+2,needed_mmregs+matrix_elements_mm, src0, src1, len, src2, src3, src4, src5, src6, src7
+%assign needed_stack_size -1 * matrix_stack_size
+%if ARCH_X86_32 && in_channels >= 7
+%assign needed_stack_size needed_stack_size - 16
+%endif
 
-; get aligned stack space if needed
-%if matrix_elements_stack > 0
-    %if mmsize == 32
-    %assign bkpreg %1 + 1
-    %define bkpq r %+ bkpreg %+ q
-    mov           bkpq, rsp
-    and           rsp, ~(mmsize-1)
-    sub           rsp, matrix_elements_stack * mmsize
-    %else
-    %assign matrix_stack_size matrix_elements_stack * mmsize
-    %assign pad matrix_stack_size + (mmsize - gprsize) - (stack_offset & (mmsize - gprsize))
-    ; on x86-32 for 7 and 8 channels we need more stack space for src pointers
-    %if ARCH_X86_32 && in_channels >= 7
-    %assign pad pad + 0x10
+cglobal mix_%1_to_%2_%3_flt, 3,in_channels+2,needed_mmregs+matrix_elements_mm, needed_stack_size, src0, src1, len, src2, src3, src4, src5, src6, src7
+
+; define src pointers on stack if needed
+%if matrix_elements_stack > 0 && ARCH_X86_32 && in_channels >= 7
     %define src5m [rsp+matrix_stack_size+0]
     %define src6m [rsp+matrix_stack_size+4]
     %define src7m [rsp+matrix_stack_size+8]
-    %endif
-    SUB           rsp, pad
-    %endif
 %endif
 
 ; load matrix pointers
@@ -463,14 +454,6 @@ cglobal mix_%1_to_%2_%3_flt, 3,in_channels+2,needed_mmregs+matrix_elements_mm, s
 
     add          lenq, mmsize
     jl .loop
-; restore stack pointer
-%if matrix_elements_stack > 0
-    %if mmsize == 32
-    mov           rsp, bkpq
-    %else
-    ADD           rsp, pad
-    %endif
-%endif
 ; zero ymm high halves
 %if mmsize == 32
     vzeroupper