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gecko-dev/media/libjpeg/simd/jidctint-mmx.asm
Ryan VanderMeulen 50bc583645 Bug 1061240 - Update libjpeg-turbo to version 1.4. r=jmuizelaar, r=glandium, f=rankov 
--HG--
rename : media/libjpeg/config.h => media/libjpeg/jconfigint.h
rename : media/libjpeg/simd/jcclrmmx.asm => media/libjpeg/simd/jccolext-mmx.asm
rename : media/libjpeg/simd/jcclrss2-64.asm => media/libjpeg/simd/jccolext-sse2-64.asm
rename : media/libjpeg/simd/jcclrss2.asm => media/libjpeg/simd/jccolext-sse2.asm
rename : media/libjpeg/simd/jccolmmx.asm => media/libjpeg/simd/jccolor-mmx.asm
rename : media/libjpeg/simd/jccolss2-64.asm => media/libjpeg/simd/jccolor-sse2-64.asm
rename : media/libjpeg/simd/jccolss2.asm => media/libjpeg/simd/jccolor-sse2.asm
rename : media/libjpeg/simd/jcgrammx.asm => media/libjpeg/simd/jcgray-mmx.asm
rename : media/libjpeg/simd/jcgrass2-64.asm => media/libjpeg/simd/jcgray-sse2-64.asm
rename : media/libjpeg/simd/jcgrass2.asm => media/libjpeg/simd/jcgray-sse2.asm
rename : media/libjpeg/simd/jcgrymmx.asm => media/libjpeg/simd/jcgryext-mmx.asm
rename : media/libjpeg/simd/jcgryss2-64.asm => media/libjpeg/simd/jcgryext-sse2-64.asm
rename : media/libjpeg/simd/jcgryss2.asm => media/libjpeg/simd/jcgryext-sse2.asm
rename : media/libjpeg/simd/jcsammmx.asm => media/libjpeg/simd/jcsample-mmx.asm
rename : media/libjpeg/simd/jcsamss2-64.asm => media/libjpeg/simd/jcsample-sse2-64.asm
rename : media/libjpeg/simd/jcsamss2.asm => media/libjpeg/simd/jcsample-sse2.asm
rename : media/libjpeg/simd/jdclrmmx.asm => media/libjpeg/simd/jdcolext-mmx.asm
rename : media/libjpeg/simd/jdclrss2-64.asm => media/libjpeg/simd/jdcolext-sse2-64.asm
rename : media/libjpeg/simd/jdclrss2.asm => media/libjpeg/simd/jdcolext-sse2.asm
rename : media/libjpeg/simd/jdcolmmx.asm => media/libjpeg/simd/jdcolor-mmx.asm
rename : media/libjpeg/simd/jdcolss2-64.asm => media/libjpeg/simd/jdcolor-sse2-64.asm
rename : media/libjpeg/simd/jdcolss2.asm => media/libjpeg/simd/jdcolor-sse2.asm
rename : media/libjpeg/simd/jdmermmx.asm => media/libjpeg/simd/jdmerge-mmx.asm
rename : media/libjpeg/simd/jdmerss2-64.asm => media/libjpeg/simd/jdmerge-sse2-64.asm
rename : media/libjpeg/simd/jdmerss2.asm => media/libjpeg/simd/jdmerge-sse2.asm
rename : media/libjpeg/simd/jdmrgmmx.asm => media/libjpeg/simd/jdmrgext-mmx.asm
rename : media/libjpeg/simd/jdmrgss2-64.asm => media/libjpeg/simd/jdmrgext-sse2-64.asm
rename : media/libjpeg/simd/jdmrgss2.asm => media/libjpeg/simd/jdmrgext-sse2.asm
rename : media/libjpeg/simd/jdsammmx.asm => media/libjpeg/simd/jdsample-mmx.asm
rename : media/libjpeg/simd/jdsamss2-64.asm => media/libjpeg/simd/jdsample-sse2-64.asm
rename : media/libjpeg/simd/jdsamss2.asm => media/libjpeg/simd/jdsample-sse2.asm
rename : media/libjpeg/simd/jf3dnflt.asm => media/libjpeg/simd/jfdctflt-3dn.asm
rename : media/libjpeg/simd/jfsseflt-64.asm => media/libjpeg/simd/jfdctflt-sse-64.asm
rename : media/libjpeg/simd/jfsseflt.asm => media/libjpeg/simd/jfdctflt-sse.asm
rename : media/libjpeg/simd/jfmmxfst.asm => media/libjpeg/simd/jfdctfst-mmx.asm
rename : media/libjpeg/simd/jfss2fst-64.asm => media/libjpeg/simd/jfdctfst-sse2-64.asm
rename : media/libjpeg/simd/jfss2fst.asm => media/libjpeg/simd/jfdctfst-sse2.asm
rename : media/libjpeg/simd/jfmmxint.asm => media/libjpeg/simd/jfdctint-mmx.asm
rename : media/libjpeg/simd/jfss2int-64.asm => media/libjpeg/simd/jfdctint-sse2-64.asm
rename : media/libjpeg/simd/jfss2int.asm => media/libjpeg/simd/jfdctint-sse2.asm
rename : media/libjpeg/simd/ji3dnflt.asm => media/libjpeg/simd/jidctflt-3dn.asm
rename : media/libjpeg/simd/jisseflt.asm => media/libjpeg/simd/jidctflt-sse.asm
rename : media/libjpeg/simd/jiss2flt-64.asm => media/libjpeg/simd/jidctflt-sse2-64.asm
rename : media/libjpeg/simd/jiss2flt.asm => media/libjpeg/simd/jidctflt-sse2.asm
rename : media/libjpeg/simd/jimmxfst.asm => media/libjpeg/simd/jidctfst-mmx.asm
rename : media/libjpeg/simd/jiss2fst-64.asm => media/libjpeg/simd/jidctfst-sse2-64.asm
rename : media/libjpeg/simd/jiss2fst.asm => media/libjpeg/simd/jidctfst-sse2.asm
rename : media/libjpeg/simd/jimmxint.asm => media/libjpeg/simd/jidctint-mmx.asm
rename : media/libjpeg/simd/jiss2int-64.asm => media/libjpeg/simd/jidctint-sse2-64.asm
rename : media/libjpeg/simd/jiss2int.asm => media/libjpeg/simd/jidctint-sse2.asm
rename : media/libjpeg/simd/jimmxred.asm => media/libjpeg/simd/jidctred-mmx.asm
rename : media/libjpeg/simd/jiss2red-64.asm => media/libjpeg/simd/jidctred-sse2-64.asm
rename : media/libjpeg/simd/jiss2red.asm => media/libjpeg/simd/jidctred-sse2.asm
rename : media/libjpeg/simd/jcqnt3dn.asm => media/libjpeg/simd/jquant-3dn.asm
rename : media/libjpeg/simd/jcqntmmx.asm => media/libjpeg/simd/jquant-mmx.asm
rename : media/libjpeg/simd/jcqntsse.asm => media/libjpeg/simd/jquant-sse.asm
rename : media/libjpeg/simd/jcqnts2f-64.asm => media/libjpeg/simd/jquantf-sse2-64.asm
rename : media/libjpeg/simd/jcqnts2f.asm => media/libjpeg/simd/jquantf-sse2.asm
rename : media/libjpeg/simd/jcqnts2i-64.asm => media/libjpeg/simd/jquanti-sse2-64.asm
rename : media/libjpeg/simd/jcqnts2i.asm => media/libjpeg/simd/jquanti-sse2.asm
2015-01-20 22:19:57 -05:00

853 lines
33 KiB
NASM
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;
; jidctint.asm - accurate integer IDCT (MMX)
;
; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
;
; Based on
; x86 SIMD extension for IJG JPEG library
; Copyright (C) 1999-2006, MIYASAKA Masaru.
; For conditions of distribution and use, see copyright notice in jsimdext.inc
;
; This file should be assembled with NASM (Netwide Assembler),
; can *not* be assembled with Microsoft's MASM or any compatible
; assembler (including Borland's Turbo Assembler).
; NASM is available from http://nasm.sourceforge.net/ or
; http://sourceforge.net/project/showfiles.php?group_id=6208
;
; This file contains a slow-but-accurate integer implementation of the
; inverse DCT (Discrete Cosine Transform). The following code is based
; directly on the IJG's original jidctint.c; see the jidctint.c for
; more details.
;
; [TAB8]
%include "jsimdext.inc"
%include "jdct.inc"
; --------------------------------------------------------------------------
%define CONST_BITS 13
%define PASS1_BITS 2
%define DESCALE_P1 (CONST_BITS-PASS1_BITS)
%define DESCALE_P2 (CONST_BITS+PASS1_BITS+3)
%if CONST_BITS == 13
F_0_298 equ 2446 ; FIX(0.298631336)
F_0_390 equ 3196 ; FIX(0.390180644)
F_0_541 equ 4433 ; FIX(0.541196100)
F_0_765 equ 6270 ; FIX(0.765366865)
F_0_899 equ 7373 ; FIX(0.899976223)
F_1_175 equ 9633 ; FIX(1.175875602)
F_1_501 equ 12299 ; FIX(1.501321110)
F_1_847 equ 15137 ; FIX(1.847759065)
F_1_961 equ 16069 ; FIX(1.961570560)
F_2_053 equ 16819 ; FIX(2.053119869)
F_2_562 equ 20995 ; FIX(2.562915447)
F_3_072 equ 25172 ; FIX(3.072711026)
%else
; NASM cannot do compile-time arithmetic on floating-point constants.
%define DESCALE(x,n) (((x)+(1<<((n)-1)))>>(n))
F_0_298 equ DESCALE( 320652955,30-CONST_BITS) ; FIX(0.298631336)
F_0_390 equ DESCALE( 418953276,30-CONST_BITS) ; FIX(0.390180644)
F_0_541 equ DESCALE( 581104887,30-CONST_BITS) ; FIX(0.541196100)
F_0_765 equ DESCALE( 821806413,30-CONST_BITS) ; FIX(0.765366865)
F_0_899 equ DESCALE( 966342111,30-CONST_BITS) ; FIX(0.899976223)
F_1_175 equ DESCALE(1262586813,30-CONST_BITS) ; FIX(1.175875602)
F_1_501 equ DESCALE(1612031267,30-CONST_BITS) ; FIX(1.501321110)
F_1_847 equ DESCALE(1984016188,30-CONST_BITS) ; FIX(1.847759065)
F_1_961 equ DESCALE(2106220350,30-CONST_BITS) ; FIX(1.961570560)
F_2_053 equ DESCALE(2204520673,30-CONST_BITS) ; FIX(2.053119869)
F_2_562 equ DESCALE(2751909506,30-CONST_BITS) ; FIX(2.562915447)
F_3_072 equ DESCALE(3299298341,30-CONST_BITS) ; FIX(3.072711026)
%endif
; --------------------------------------------------------------------------
SECTION SEG_CONST
alignz 16
global EXTN(jconst_idct_islow_mmx)
EXTN(jconst_idct_islow_mmx):
PW_F130_F054 times 2 dw (F_0_541+F_0_765), F_0_541
PW_F054_MF130 times 2 dw F_0_541, (F_0_541-F_1_847)
PW_MF078_F117 times 2 dw (F_1_175-F_1_961), F_1_175
PW_F117_F078 times 2 dw F_1_175, (F_1_175-F_0_390)
PW_MF060_MF089 times 2 dw (F_0_298-F_0_899),-F_0_899
PW_MF089_F060 times 2 dw -F_0_899, (F_1_501-F_0_899)
PW_MF050_MF256 times 2 dw (F_2_053-F_2_562),-F_2_562
PW_MF256_F050 times 2 dw -F_2_562, (F_3_072-F_2_562)
PD_DESCALE_P1 times 2 dd 1 << (DESCALE_P1-1)
PD_DESCALE_P2 times 2 dd 1 << (DESCALE_P2-1)
PB_CENTERJSAMP times 8 db CENTERJSAMPLE
alignz 16
; --------------------------------------------------------------------------
SECTION SEG_TEXT
BITS 32
;
; Perform dequantization and inverse DCT on one block of coefficients.
;
; GLOBAL(void)
; jsimd_idct_islow_mmx (void * dct_table, JCOEFPTR coef_block,
; JSAMPARRAY output_buf, JDIMENSION output_col)
;
%define dct_table(b) (b)+8 ; jpeg_component_info * compptr
%define coef_block(b) (b)+12 ; JCOEFPTR coef_block
%define output_buf(b) (b)+16 ; JSAMPARRAY output_buf
%define output_col(b) (b)+20 ; JDIMENSION output_col
%define original_ebp ebp+0
%define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM]
%define WK_NUM 12
%define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF
; JCOEF workspace[DCTSIZE2]
align 16
global EXTN(jsimd_idct_islow_mmx)
EXTN(jsimd_idct_islow_mmx):
push ebp
mov eax,esp ; eax = original ebp
sub esp, byte 4
and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits
mov [esp],eax
mov ebp,esp ; ebp = aligned ebp
lea esp, [workspace]
push ebx
; push ecx ; need not be preserved
; push edx ; need not be preserved
push esi
push edi
get_GOT ebx ; get GOT address
; ---- Pass 1: process columns from input, store into work array.
; mov eax, [original_ebp]
mov edx, POINTER [dct_table(eax)] ; quantptr
mov esi, JCOEFPTR [coef_block(eax)] ; inptr
lea edi, [workspace] ; JCOEF * wsptr
mov ecx, DCTSIZE/4 ; ctr
alignx 16,7
.columnloop:
%ifndef NO_ZERO_COLUMN_TEST_ISLOW_MMX
mov eax, DWORD [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
or eax, DWORD [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
jnz short .columnDCT
movq mm0, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
por mm1, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
por mm0, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
por mm1,mm0
packsswb mm1,mm1
movd eax,mm1
test eax,eax
jnz short .columnDCT
; -- AC terms all zero
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
psllw mm0,PASS1_BITS
movq mm2,mm0 ; mm0=in0=(00 01 02 03)
punpcklwd mm0,mm0 ; mm0=(00 00 01 01)
punpckhwd mm2,mm2 ; mm2=(02 02 03 03)
movq mm1,mm0
punpckldq mm0,mm0 ; mm0=(00 00 00 00)
punpckhdq mm1,mm1 ; mm1=(01 01 01 01)
movq mm3,mm2
punpckldq mm2,mm2 ; mm2=(02 02 02 02)
punpckhdq mm3,mm3 ; mm3=(03 03 03 03)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm3
movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm3
jmp near .nextcolumn
alignx 16,7
%endif
.columnDCT:
; -- Even part
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
pmullw mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm1, MMWORD [MMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
pmullw mm2, MMWORD [MMBLOCK(4,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
; (Original)
; z1 = (z2 + z3) * 0.541196100;
; tmp2 = z1 + z3 * -1.847759065;
; tmp3 = z1 + z2 * 0.765366865;
;
; (This implementation)
; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
movq mm4,mm1 ; mm1=in2=z2
movq mm5,mm1
punpcklwd mm4,mm3 ; mm3=in6=z3
punpckhwd mm5,mm3
movq mm1,mm4
movq mm3,mm5
pmaddwd mm4,[GOTOFF(ebx,PW_F130_F054)] ; mm4=tmp3L
pmaddwd mm5,[GOTOFF(ebx,PW_F130_F054)] ; mm5=tmp3H
pmaddwd mm1,[GOTOFF(ebx,PW_F054_MF130)] ; mm1=tmp2L
pmaddwd mm3,[GOTOFF(ebx,PW_F054_MF130)] ; mm3=tmp2H
movq mm6,mm0
paddw mm0,mm2 ; mm0=in0+in4
psubw mm6,mm2 ; mm6=in0-in4
pxor mm7,mm7
pxor mm2,mm2
punpcklwd mm7,mm0 ; mm7=tmp0L
punpckhwd mm2,mm0 ; mm2=tmp0H
psrad mm7,(16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
psrad mm2,(16-CONST_BITS) ; psrad mm2,16 & pslld mm2,CONST_BITS
movq mm0,mm7
paddd mm7,mm4 ; mm7=tmp10L
psubd mm0,mm4 ; mm0=tmp13L
movq mm4,mm2
paddd mm2,mm5 ; mm2=tmp10H
psubd mm4,mm5 ; mm4=tmp13H
movq MMWORD [wk(0)], mm7 ; wk(0)=tmp10L
movq MMWORD [wk(1)], mm2 ; wk(1)=tmp10H
movq MMWORD [wk(2)], mm0 ; wk(2)=tmp13L
movq MMWORD [wk(3)], mm4 ; wk(3)=tmp13H
pxor mm5,mm5
pxor mm7,mm7
punpcklwd mm5,mm6 ; mm5=tmp1L
punpckhwd mm7,mm6 ; mm7=tmp1H
psrad mm5,(16-CONST_BITS) ; psrad mm5,16 & pslld mm5,CONST_BITS
psrad mm7,(16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
movq mm2,mm5
paddd mm5,mm1 ; mm5=tmp11L
psubd mm2,mm1 ; mm2=tmp12L
movq mm0,mm7
paddd mm7,mm3 ; mm7=tmp11H
psubd mm0,mm3 ; mm0=tmp12H
movq MMWORD [wk(4)], mm5 ; wk(4)=tmp11L
movq MMWORD [wk(5)], mm7 ; wk(5)=tmp11H
movq MMWORD [wk(6)], mm2 ; wk(6)=tmp12L
movq MMWORD [wk(7)], mm0 ; wk(7)=tmp12H
; -- Odd part
movq mm4, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm6, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
pmullw mm4, MMWORD [MMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm6, MMWORD [MMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
pmullw mm1, MMWORD [MMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
pmullw mm3, MMWORD [MMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
movq mm5,mm6
movq mm7,mm4
paddw mm5,mm3 ; mm5=z3
paddw mm7,mm1 ; mm7=z4
; (Original)
; z5 = (z3 + z4) * 1.175875602;
; z3 = z3 * -1.961570560; z4 = z4 * -0.390180644;
; z3 += z5; z4 += z5;
;
; (This implementation)
; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
movq mm2,mm5
movq mm0,mm5
punpcklwd mm2,mm7
punpckhwd mm0,mm7
movq mm5,mm2
movq mm7,mm0
pmaddwd mm2,[GOTOFF(ebx,PW_MF078_F117)] ; mm2=z3L
pmaddwd mm0,[GOTOFF(ebx,PW_MF078_F117)] ; mm0=z3H
pmaddwd mm5,[GOTOFF(ebx,PW_F117_F078)] ; mm5=z4L
pmaddwd mm7,[GOTOFF(ebx,PW_F117_F078)] ; mm7=z4H
movq MMWORD [wk(10)], mm2 ; wk(10)=z3L
movq MMWORD [wk(11)], mm0 ; wk(11)=z3H
; (Original)
; z1 = tmp0 + tmp3; z2 = tmp1 + tmp2;
; tmp0 = tmp0 * 0.298631336; tmp1 = tmp1 * 2.053119869;
; tmp2 = tmp2 * 3.072711026; tmp3 = tmp3 * 1.501321110;
; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447;
; tmp0 += z1 + z3; tmp1 += z2 + z4;
; tmp2 += z2 + z3; tmp3 += z1 + z4;
;
; (This implementation)
; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
; tmp0 += z3; tmp1 += z4;
; tmp2 += z3; tmp3 += z4;
movq mm2,mm3
movq mm0,mm3
punpcklwd mm2,mm4
punpckhwd mm0,mm4
movq mm3,mm2
movq mm4,mm0
pmaddwd mm2,[GOTOFF(ebx,PW_MF060_MF089)] ; mm2=tmp0L
pmaddwd mm0,[GOTOFF(ebx,PW_MF060_MF089)] ; mm0=tmp0H
pmaddwd mm3,[GOTOFF(ebx,PW_MF089_F060)] ; mm3=tmp3L
pmaddwd mm4,[GOTOFF(ebx,PW_MF089_F060)] ; mm4=tmp3H
paddd mm2, MMWORD [wk(10)] ; mm2=tmp0L
paddd mm0, MMWORD [wk(11)] ; mm0=tmp0H
paddd mm3,mm5 ; mm3=tmp3L
paddd mm4,mm7 ; mm4=tmp3H
movq MMWORD [wk(8)], mm2 ; wk(8)=tmp0L
movq MMWORD [wk(9)], mm0 ; wk(9)=tmp0H
movq mm2,mm1
movq mm0,mm1
punpcklwd mm2,mm6
punpckhwd mm0,mm6
movq mm1,mm2
movq mm6,mm0
pmaddwd mm2,[GOTOFF(ebx,PW_MF050_MF256)] ; mm2=tmp1L
pmaddwd mm0,[GOTOFF(ebx,PW_MF050_MF256)] ; mm0=tmp1H
pmaddwd mm1,[GOTOFF(ebx,PW_MF256_F050)] ; mm1=tmp2L
pmaddwd mm6,[GOTOFF(ebx,PW_MF256_F050)] ; mm6=tmp2H
paddd mm2,mm5 ; mm2=tmp1L
paddd mm0,mm7 ; mm0=tmp1H
paddd mm1, MMWORD [wk(10)] ; mm1=tmp2L
paddd mm6, MMWORD [wk(11)] ; mm6=tmp2H
movq MMWORD [wk(10)], mm2 ; wk(10)=tmp1L
movq MMWORD [wk(11)], mm0 ; wk(11)=tmp1H
; -- Final output stage
movq mm5, MMWORD [wk(0)] ; mm5=tmp10L
movq mm7, MMWORD [wk(1)] ; mm7=tmp10H
movq mm2,mm5
movq mm0,mm7
paddd mm5,mm3 ; mm5=data0L
paddd mm7,mm4 ; mm7=data0H
psubd mm2,mm3 ; mm2=data7L
psubd mm0,mm4 ; mm0=data7H
movq mm3,[GOTOFF(ebx,PD_DESCALE_P1)] ; mm3=[PD_DESCALE_P1]
paddd mm5,mm3
paddd mm7,mm3
psrad mm5,DESCALE_P1
psrad mm7,DESCALE_P1
paddd mm2,mm3
paddd mm0,mm3
psrad mm2,DESCALE_P1
psrad mm0,DESCALE_P1
packssdw mm5,mm7 ; mm5=data0=(00 01 02 03)
packssdw mm2,mm0 ; mm2=data7=(70 71 72 73)
movq mm4, MMWORD [wk(4)] ; mm4=tmp11L
movq mm3, MMWORD [wk(5)] ; mm3=tmp11H
movq mm7,mm4
movq mm0,mm3
paddd mm4,mm1 ; mm4=data1L
paddd mm3,mm6 ; mm3=data1H
psubd mm7,mm1 ; mm7=data6L
psubd mm0,mm6 ; mm0=data6H
movq mm1,[GOTOFF(ebx,PD_DESCALE_P1)] ; mm1=[PD_DESCALE_P1]
paddd mm4,mm1
paddd mm3,mm1
psrad mm4,DESCALE_P1
psrad mm3,DESCALE_P1
paddd mm7,mm1
paddd mm0,mm1
psrad mm7,DESCALE_P1
psrad mm0,DESCALE_P1
packssdw mm4,mm3 ; mm4=data1=(10 11 12 13)
packssdw mm7,mm0 ; mm7=data6=(60 61 62 63)
movq mm6,mm5 ; transpose coefficients(phase 1)
punpcklwd mm5,mm4 ; mm5=(00 10 01 11)
punpckhwd mm6,mm4 ; mm6=(02 12 03 13)
movq mm1,mm7 ; transpose coefficients(phase 1)
punpcklwd mm7,mm2 ; mm7=(60 70 61 71)
punpckhwd mm1,mm2 ; mm1=(62 72 63 73)
movq mm3, MMWORD [wk(6)] ; mm3=tmp12L
movq mm0, MMWORD [wk(7)] ; mm0=tmp12H
movq mm4, MMWORD [wk(10)] ; mm4=tmp1L
movq mm2, MMWORD [wk(11)] ; mm2=tmp1H
movq MMWORD [wk(0)], mm5 ; wk(0)=(00 10 01 11)
movq MMWORD [wk(1)], mm6 ; wk(1)=(02 12 03 13)
movq MMWORD [wk(4)], mm7 ; wk(4)=(60 70 61 71)
movq MMWORD [wk(5)], mm1 ; wk(5)=(62 72 63 73)
movq mm5,mm3
movq mm6,mm0
paddd mm3,mm4 ; mm3=data2L
paddd mm0,mm2 ; mm0=data2H
psubd mm5,mm4 ; mm5=data5L
psubd mm6,mm2 ; mm6=data5H
movq mm7,[GOTOFF(ebx,PD_DESCALE_P1)] ; mm7=[PD_DESCALE_P1]
paddd mm3,mm7
paddd mm0,mm7
psrad mm3,DESCALE_P1
psrad mm0,DESCALE_P1
paddd mm5,mm7
paddd mm6,mm7
psrad mm5,DESCALE_P1
psrad mm6,DESCALE_P1
packssdw mm3,mm0 ; mm3=data2=(20 21 22 23)
packssdw mm5,mm6 ; mm5=data5=(50 51 52 53)
movq mm1, MMWORD [wk(2)] ; mm1=tmp13L
movq mm4, MMWORD [wk(3)] ; mm4=tmp13H
movq mm2, MMWORD [wk(8)] ; mm2=tmp0L
movq mm7, MMWORD [wk(9)] ; mm7=tmp0H
movq mm0,mm1
movq mm6,mm4
paddd mm1,mm2 ; mm1=data3L
paddd mm4,mm7 ; mm4=data3H
psubd mm0,mm2 ; mm0=data4L
psubd mm6,mm7 ; mm6=data4H
movq mm2,[GOTOFF(ebx,PD_DESCALE_P1)] ; mm2=[PD_DESCALE_P1]
paddd mm1,mm2
paddd mm4,mm2
psrad mm1,DESCALE_P1
psrad mm4,DESCALE_P1
paddd mm0,mm2
paddd mm6,mm2
psrad mm0,DESCALE_P1
psrad mm6,DESCALE_P1
packssdw mm1,mm4 ; mm1=data3=(30 31 32 33)
packssdw mm0,mm6 ; mm0=data4=(40 41 42 43)
movq mm7, MMWORD [wk(0)] ; mm7=(00 10 01 11)
movq mm2, MMWORD [wk(1)] ; mm2=(02 12 03 13)
movq mm4,mm3 ; transpose coefficients(phase 1)
punpcklwd mm3,mm1 ; mm3=(20 30 21 31)
punpckhwd mm4,mm1 ; mm4=(22 32 23 33)
movq mm6,mm0 ; transpose coefficients(phase 1)
punpcklwd mm0,mm5 ; mm0=(40 50 41 51)
punpckhwd mm6,mm5 ; mm6=(42 52 43 53)
movq mm1,mm7 ; transpose coefficients(phase 2)
punpckldq mm7,mm3 ; mm7=(00 10 20 30)
punpckhdq mm1,mm3 ; mm1=(01 11 21 31)
movq mm5,mm2 ; transpose coefficients(phase 2)
punpckldq mm2,mm4 ; mm2=(02 12 22 32)
punpckhdq mm5,mm4 ; mm5=(03 13 23 33)
movq mm3, MMWORD [wk(4)] ; mm3=(60 70 61 71)
movq mm4, MMWORD [wk(5)] ; mm4=(62 72 63 73)
movq MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm7
movq MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm1
movq MMWORD [MMBLOCK(2,0,edi,SIZEOF_JCOEF)], mm2
movq MMWORD [MMBLOCK(3,0,edi,SIZEOF_JCOEF)], mm5
movq mm7,mm0 ; transpose coefficients(phase 2)
punpckldq mm0,mm3 ; mm0=(40 50 60 70)
punpckhdq mm7,mm3 ; mm7=(41 51 61 71)
movq mm1,mm6 ; transpose coefficients(phase 2)
punpckldq mm6,mm4 ; mm6=(42 52 62 72)
punpckhdq mm1,mm4 ; mm1=(43 53 63 73)
movq MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm0
movq MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm7
movq MMWORD [MMBLOCK(2,1,edi,SIZEOF_JCOEF)], mm6
movq MMWORD [MMBLOCK(3,1,edi,SIZEOF_JCOEF)], mm1
.nextcolumn:
add esi, byte 4*SIZEOF_JCOEF ; coef_block
add edx, byte 4*SIZEOF_ISLOW_MULT_TYPE ; quantptr
add edi, byte 4*DCTSIZE*SIZEOF_JCOEF ; wsptr
dec ecx ; ctr
jnz near .columnloop
; ---- Pass 2: process rows from work array, store into output array.
mov eax, [original_ebp]
lea esi, [workspace] ; JCOEF * wsptr
mov edi, JSAMPARRAY [output_buf(eax)] ; (JSAMPROW *)
mov eax, JDIMENSION [output_col(eax)]
mov ecx, DCTSIZE/4 ; ctr
alignx 16,7
.rowloop:
; -- Even part
movq mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(2,0,esi,SIZEOF_JCOEF)]
movq mm2, MMWORD [MMBLOCK(4,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(6,0,esi,SIZEOF_JCOEF)]
; (Original)
; z1 = (z2 + z3) * 0.541196100;
; tmp2 = z1 + z3 * -1.847759065;
; tmp3 = z1 + z2 * 0.765366865;
;
; (This implementation)
; tmp2 = z2 * 0.541196100 + z3 * (0.541196100 - 1.847759065);
; tmp3 = z2 * (0.541196100 + 0.765366865) + z3 * 0.541196100;
movq mm4,mm1 ; mm1=in2=z2
movq mm5,mm1
punpcklwd mm4,mm3 ; mm3=in6=z3
punpckhwd mm5,mm3
movq mm1,mm4
movq mm3,mm5
pmaddwd mm4,[GOTOFF(ebx,PW_F130_F054)] ; mm4=tmp3L
pmaddwd mm5,[GOTOFF(ebx,PW_F130_F054)] ; mm5=tmp3H
pmaddwd mm1,[GOTOFF(ebx,PW_F054_MF130)] ; mm1=tmp2L
pmaddwd mm3,[GOTOFF(ebx,PW_F054_MF130)] ; mm3=tmp2H
movq mm6,mm0
paddw mm0,mm2 ; mm0=in0+in4
psubw mm6,mm2 ; mm6=in0-in4
pxor mm7,mm7
pxor mm2,mm2
punpcklwd mm7,mm0 ; mm7=tmp0L
punpckhwd mm2,mm0 ; mm2=tmp0H
psrad mm7,(16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
psrad mm2,(16-CONST_BITS) ; psrad mm2,16 & pslld mm2,CONST_BITS
movq mm0,mm7
paddd mm7,mm4 ; mm7=tmp10L
psubd mm0,mm4 ; mm0=tmp13L
movq mm4,mm2
paddd mm2,mm5 ; mm2=tmp10H
psubd mm4,mm5 ; mm4=tmp13H
movq MMWORD [wk(0)], mm7 ; wk(0)=tmp10L
movq MMWORD [wk(1)], mm2 ; wk(1)=tmp10H
movq MMWORD [wk(2)], mm0 ; wk(2)=tmp13L
movq MMWORD [wk(3)], mm4 ; wk(3)=tmp13H
pxor mm5,mm5
pxor mm7,mm7
punpcklwd mm5,mm6 ; mm5=tmp1L
punpckhwd mm7,mm6 ; mm7=tmp1H
psrad mm5,(16-CONST_BITS) ; psrad mm5,16 & pslld mm5,CONST_BITS
psrad mm7,(16-CONST_BITS) ; psrad mm7,16 & pslld mm7,CONST_BITS
movq mm2,mm5
paddd mm5,mm1 ; mm5=tmp11L
psubd mm2,mm1 ; mm2=tmp12L
movq mm0,mm7
paddd mm7,mm3 ; mm7=tmp11H
psubd mm0,mm3 ; mm0=tmp12H
movq MMWORD [wk(4)], mm5 ; wk(4)=tmp11L
movq MMWORD [wk(5)], mm7 ; wk(5)=tmp11H
movq MMWORD [wk(6)], mm2 ; wk(6)=tmp12L
movq MMWORD [wk(7)], mm0 ; wk(7)=tmp12H
; -- Odd part
movq mm4, MMWORD [MMBLOCK(1,0,esi,SIZEOF_JCOEF)]
movq mm6, MMWORD [MMBLOCK(3,0,esi,SIZEOF_JCOEF)]
movq mm1, MMWORD [MMBLOCK(5,0,esi,SIZEOF_JCOEF)]
movq mm3, MMWORD [MMBLOCK(7,0,esi,SIZEOF_JCOEF)]
movq mm5,mm6
movq mm7,mm4
paddw mm5,mm3 ; mm5=z3
paddw mm7,mm1 ; mm7=z4
; (Original)
; z5 = (z3 + z4) * 1.175875602;
; z3 = z3 * -1.961570560; z4 = z4 * -0.390180644;
; z3 += z5; z4 += z5;
;
; (This implementation)
; z3 = z3 * (1.175875602 - 1.961570560) + z4 * 1.175875602;
; z4 = z3 * 1.175875602 + z4 * (1.175875602 - 0.390180644);
movq mm2,mm5
movq mm0,mm5
punpcklwd mm2,mm7
punpckhwd mm0,mm7
movq mm5,mm2
movq mm7,mm0
pmaddwd mm2,[GOTOFF(ebx,PW_MF078_F117)] ; mm2=z3L
pmaddwd mm0,[GOTOFF(ebx,PW_MF078_F117)] ; mm0=z3H
pmaddwd mm5,[GOTOFF(ebx,PW_F117_F078)] ; mm5=z4L
pmaddwd mm7,[GOTOFF(ebx,PW_F117_F078)] ; mm7=z4H
movq MMWORD [wk(10)], mm2 ; wk(10)=z3L
movq MMWORD [wk(11)], mm0 ; wk(11)=z3H
; (Original)
; z1 = tmp0 + tmp3; z2 = tmp1 + tmp2;
; tmp0 = tmp0 * 0.298631336; tmp1 = tmp1 * 2.053119869;
; tmp2 = tmp2 * 3.072711026; tmp3 = tmp3 * 1.501321110;
; z1 = z1 * -0.899976223; z2 = z2 * -2.562915447;
; tmp0 += z1 + z3; tmp1 += z2 + z4;
; tmp2 += z2 + z3; tmp3 += z1 + z4;
;
; (This implementation)
; tmp0 = tmp0 * (0.298631336 - 0.899976223) + tmp3 * -0.899976223;
; tmp1 = tmp1 * (2.053119869 - 2.562915447) + tmp2 * -2.562915447;
; tmp2 = tmp1 * -2.562915447 + tmp2 * (3.072711026 - 2.562915447);
; tmp3 = tmp0 * -0.899976223 + tmp3 * (1.501321110 - 0.899976223);
; tmp0 += z3; tmp1 += z4;
; tmp2 += z3; tmp3 += z4;
movq mm2,mm3
movq mm0,mm3
punpcklwd mm2,mm4
punpckhwd mm0,mm4
movq mm3,mm2
movq mm4,mm0
pmaddwd mm2,[GOTOFF(ebx,PW_MF060_MF089)] ; mm2=tmp0L
pmaddwd mm0,[GOTOFF(ebx,PW_MF060_MF089)] ; mm0=tmp0H
pmaddwd mm3,[GOTOFF(ebx,PW_MF089_F060)] ; mm3=tmp3L
pmaddwd mm4,[GOTOFF(ebx,PW_MF089_F060)] ; mm4=tmp3H
paddd mm2, MMWORD [wk(10)] ; mm2=tmp0L
paddd mm0, MMWORD [wk(11)] ; mm0=tmp0H
paddd mm3,mm5 ; mm3=tmp3L
paddd mm4,mm7 ; mm4=tmp3H
movq MMWORD [wk(8)], mm2 ; wk(8)=tmp0L
movq MMWORD [wk(9)], mm0 ; wk(9)=tmp0H
movq mm2,mm1
movq mm0,mm1
punpcklwd mm2,mm6
punpckhwd mm0,mm6
movq mm1,mm2
movq mm6,mm0
pmaddwd mm2,[GOTOFF(ebx,PW_MF050_MF256)] ; mm2=tmp1L
pmaddwd mm0,[GOTOFF(ebx,PW_MF050_MF256)] ; mm0=tmp1H
pmaddwd mm1,[GOTOFF(ebx,PW_MF256_F050)] ; mm1=tmp2L
pmaddwd mm6,[GOTOFF(ebx,PW_MF256_F050)] ; mm6=tmp2H
paddd mm2,mm5 ; mm2=tmp1L
paddd mm0,mm7 ; mm0=tmp1H
paddd mm1, MMWORD [wk(10)] ; mm1=tmp2L
paddd mm6, MMWORD [wk(11)] ; mm6=tmp2H
movq MMWORD [wk(10)], mm2 ; wk(10)=tmp1L
movq MMWORD [wk(11)], mm0 ; wk(11)=tmp1H
; -- Final output stage
movq mm5, MMWORD [wk(0)] ; mm5=tmp10L
movq mm7, MMWORD [wk(1)] ; mm7=tmp10H
movq mm2,mm5
movq mm0,mm7
paddd mm5,mm3 ; mm5=data0L
paddd mm7,mm4 ; mm7=data0H
psubd mm2,mm3 ; mm2=data7L
psubd mm0,mm4 ; mm0=data7H
movq mm3,[GOTOFF(ebx,PD_DESCALE_P2)] ; mm3=[PD_DESCALE_P2]
paddd mm5,mm3
paddd mm7,mm3
psrad mm5,DESCALE_P2
psrad mm7,DESCALE_P2
paddd mm2,mm3
paddd mm0,mm3
psrad mm2,DESCALE_P2
psrad mm0,DESCALE_P2
packssdw mm5,mm7 ; mm5=data0=(00 10 20 30)
packssdw mm2,mm0 ; mm2=data7=(07 17 27 37)
movq mm4, MMWORD [wk(4)] ; mm4=tmp11L
movq mm3, MMWORD [wk(5)] ; mm3=tmp11H
movq mm7,mm4
movq mm0,mm3
paddd mm4,mm1 ; mm4=data1L
paddd mm3,mm6 ; mm3=data1H
psubd mm7,mm1 ; mm7=data6L
psubd mm0,mm6 ; mm0=data6H
movq mm1,[GOTOFF(ebx,PD_DESCALE_P2)] ; mm1=[PD_DESCALE_P2]
paddd mm4,mm1
paddd mm3,mm1
psrad mm4,DESCALE_P2
psrad mm3,DESCALE_P2
paddd mm7,mm1
paddd mm0,mm1
psrad mm7,DESCALE_P2
psrad mm0,DESCALE_P2
packssdw mm4,mm3 ; mm4=data1=(01 11 21 31)
packssdw mm7,mm0 ; mm7=data6=(06 16 26 36)
packsswb mm5,mm7 ; mm5=(00 10 20 30 06 16 26 36)
packsswb mm4,mm2 ; mm4=(01 11 21 31 07 17 27 37)
movq mm6, MMWORD [wk(6)] ; mm6=tmp12L
movq mm1, MMWORD [wk(7)] ; mm1=tmp12H
movq mm3, MMWORD [wk(10)] ; mm3=tmp1L
movq mm0, MMWORD [wk(11)] ; mm0=tmp1H
movq MMWORD [wk(0)], mm5 ; wk(0)=(00 10 20 30 06 16 26 36)
movq MMWORD [wk(1)], mm4 ; wk(1)=(01 11 21 31 07 17 27 37)
movq mm7,mm6
movq mm2,mm1
paddd mm6,mm3 ; mm6=data2L
paddd mm1,mm0 ; mm1=data2H
psubd mm7,mm3 ; mm7=data5L
psubd mm2,mm0 ; mm2=data5H
movq mm5,[GOTOFF(ebx,PD_DESCALE_P2)] ; mm5=[PD_DESCALE_P2]
paddd mm6,mm5
paddd mm1,mm5
psrad mm6,DESCALE_P2
psrad mm1,DESCALE_P2
paddd mm7,mm5
paddd mm2,mm5
psrad mm7,DESCALE_P2
psrad mm2,DESCALE_P2
packssdw mm6,mm1 ; mm6=data2=(02 12 22 32)
packssdw mm7,mm2 ; mm7=data5=(05 15 25 35)
movq mm4, MMWORD [wk(2)] ; mm4=tmp13L
movq mm3, MMWORD [wk(3)] ; mm3=tmp13H
movq mm0, MMWORD [wk(8)] ; mm0=tmp0L
movq mm5, MMWORD [wk(9)] ; mm5=tmp0H
movq mm1,mm4
movq mm2,mm3
paddd mm4,mm0 ; mm4=data3L
paddd mm3,mm5 ; mm3=data3H
psubd mm1,mm0 ; mm1=data4L
psubd mm2,mm5 ; mm2=data4H
movq mm0,[GOTOFF(ebx,PD_DESCALE_P2)] ; mm0=[PD_DESCALE_P2]
paddd mm4,mm0
paddd mm3,mm0
psrad mm4,DESCALE_P2
psrad mm3,DESCALE_P2
paddd mm1,mm0
paddd mm2,mm0
psrad mm1,DESCALE_P2
psrad mm2,DESCALE_P2
movq mm5,[GOTOFF(ebx,PB_CENTERJSAMP)] ; mm5=[PB_CENTERJSAMP]
packssdw mm4,mm3 ; mm4=data3=(03 13 23 33)
packssdw mm1,mm2 ; mm1=data4=(04 14 24 34)
movq mm0, MMWORD [wk(0)] ; mm0=(00 10 20 30 06 16 26 36)
movq mm3, MMWORD [wk(1)] ; mm3=(01 11 21 31 07 17 27 37)
packsswb mm6,mm1 ; mm6=(02 12 22 32 04 14 24 34)
packsswb mm4,mm7 ; mm4=(03 13 23 33 05 15 25 35)
paddb mm0,mm5
paddb mm3,mm5
paddb mm6,mm5
paddb mm4,mm5
movq mm2,mm0 ; transpose coefficients(phase 1)
punpcklbw mm0,mm3 ; mm0=(00 01 10 11 20 21 30 31)
punpckhbw mm2,mm3 ; mm2=(06 07 16 17 26 27 36 37)
movq mm1,mm6 ; transpose coefficients(phase 1)
punpcklbw mm6,mm4 ; mm6=(02 03 12 13 22 23 32 33)
punpckhbw mm1,mm4 ; mm1=(04 05 14 15 24 25 34 35)
movq mm7,mm0 ; transpose coefficients(phase 2)
punpcklwd mm0,mm6 ; mm0=(00 01 02 03 10 11 12 13)
punpckhwd mm7,mm6 ; mm7=(20 21 22 23 30 31 32 33)
movq mm5,mm1 ; transpose coefficients(phase 2)
punpcklwd mm1,mm2 ; mm1=(04 05 06 07 14 15 16 17)
punpckhwd mm5,mm2 ; mm5=(24 25 26 27 34 35 36 37)
movq mm3,mm0 ; transpose coefficients(phase 3)
punpckldq mm0,mm1 ; mm0=(00 01 02 03 04 05 06 07)
punpckhdq mm3,mm1 ; mm3=(10 11 12 13 14 15 16 17)
movq mm4,mm7 ; transpose coefficients(phase 3)
punpckldq mm7,mm5 ; mm7=(20 21 22 23 24 25 26 27)
punpckhdq mm4,mm5 ; mm4=(30 31 32 33 34 35 36 37)
pushpic ebx ; save GOT address
mov edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
mov ebx, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm0
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm3
mov edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
mov ebx, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
movq MMWORD [edx+eax*SIZEOF_JSAMPLE], mm7
movq MMWORD [ebx+eax*SIZEOF_JSAMPLE], mm4
poppic ebx ; restore GOT address
add esi, byte 4*SIZEOF_JCOEF ; wsptr
add edi, byte 4*SIZEOF_JSAMPROW
dec ecx ; ctr
jnz near .rowloop
emms ; empty MMX state
pop edi
pop esi
; pop edx ; need not be preserved
; pop ecx ; need not be preserved
pop ebx
mov esp,ebp ; esp <- aligned ebp
pop esp ; esp <- original ebp
pop ebp
ret
; For some reason, the OS X linker does not honor the request to align the
; segment unless we do this.
align 16
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