;
; jquant.asm - sample data conversion and quantization (3DNow! & 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
;
; [TAB8]

%include "jsimdext.inc"
%include "jdct.inc"

; --------------------------------------------------------------------------
        SECTION SEG_TEXT
        BITS    32
;
; Load data into workspace, applying unsigned->signed conversion
;
; GLOBAL(void)
; jsimd_convsamp_float_3dnow (JSAMPARRAY sample_data, JDIMENSION start_col,
;                             FAST_FLOAT *workspace);
;

%define sample_data     ebp+8           ; JSAMPARRAY sample_data
%define start_col       ebp+12          ; JDIMENSION start_col
%define workspace       ebp+16          ; FAST_FLOAT *workspace

        align   16
        global  EXTN(jsimd_convsamp_float_3dnow) PRIVATE

EXTN(jsimd_convsamp_float_3dnow):
        push    ebp
        mov     ebp,esp
        push    ebx
;       push    ecx             ; need not be preserved
;       push    edx             ; need not be preserved
        push    esi
        push    edi

        pcmpeqw  mm7,mm7
        psllw    mm7,7
        packsswb mm7,mm7                ; mm7 = PB_CENTERJSAMPLE (0x808080..)

        mov     esi, JSAMPARRAY [sample_data]   ; (JSAMPROW *)
        mov     eax, JDIMENSION [start_col]
        mov     edi, POINTER [workspace]        ; (DCTELEM *)
        mov     ecx, DCTSIZE/2
        alignx  16,7
.convloop:
        mov     ebx, JSAMPROW [esi+0*SIZEOF_JSAMPROW]   ; (JSAMPLE *)
        mov     edx, JSAMPROW [esi+1*SIZEOF_JSAMPROW]   ; (JSAMPLE *)

        movq    mm0, MMWORD [ebx+eax*SIZEOF_JSAMPLE]
        movq    mm1, MMWORD [edx+eax*SIZEOF_JSAMPLE]

        psubb   mm0,mm7                         ; mm0=(01234567)
        psubb   mm1,mm7                         ; mm1=(89ABCDEF)

        punpcklbw mm2,mm0                       ; mm2=(*0*1*2*3)
        punpckhbw mm0,mm0                       ; mm0=(*4*5*6*7)
        punpcklbw mm3,mm1                       ; mm3=(*8*9*A*B)
        punpckhbw mm1,mm1                       ; mm1=(*C*D*E*F)

        punpcklwd mm4,mm2                       ; mm4=(***0***1)
        punpckhwd mm2,mm2                       ; mm2=(***2***3)
        punpcklwd mm5,mm0                       ; mm5=(***4***5)
        punpckhwd mm0,mm0                       ; mm0=(***6***7)

        psrad   mm4,(DWORD_BIT-BYTE_BIT)        ; mm4=(01)
        psrad   mm2,(DWORD_BIT-BYTE_BIT)        ; mm2=(23)
        pi2fd   mm4,mm4
        pi2fd   mm2,mm2
        psrad   mm5,(DWORD_BIT-BYTE_BIT)        ; mm5=(45)
        psrad   mm0,(DWORD_BIT-BYTE_BIT)        ; mm0=(67)
        pi2fd   mm5,mm5
        pi2fd   mm0,mm0

        movq    MMWORD [MMBLOCK(0,0,edi,SIZEOF_FAST_FLOAT)], mm4
        movq    MMWORD [MMBLOCK(0,1,edi,SIZEOF_FAST_FLOAT)], mm2
        movq    MMWORD [MMBLOCK(0,2,edi,SIZEOF_FAST_FLOAT)], mm5
        movq    MMWORD [MMBLOCK(0,3,edi,SIZEOF_FAST_FLOAT)], mm0

        punpcklwd mm6,mm3                       ; mm6=(***8***9)
        punpckhwd mm3,mm3                       ; mm3=(***A***B)
        punpcklwd mm4,mm1                       ; mm4=(***C***D)
        punpckhwd mm1,mm1                       ; mm1=(***E***F)

        psrad   mm6,(DWORD_BIT-BYTE_BIT)        ; mm6=(89)
        psrad   mm3,(DWORD_BIT-BYTE_BIT)        ; mm3=(AB)
        pi2fd   mm6,mm6
        pi2fd   mm3,mm3
        psrad   mm4,(DWORD_BIT-BYTE_BIT)        ; mm4=(CD)
        psrad   mm1,(DWORD_BIT-BYTE_BIT)        ; mm1=(EF)
        pi2fd   mm4,mm4
        pi2fd   mm1,mm1

        movq    MMWORD [MMBLOCK(1,0,edi,SIZEOF_FAST_FLOAT)], mm6
        movq    MMWORD [MMBLOCK(1,1,edi,SIZEOF_FAST_FLOAT)], mm3
        movq    MMWORD [MMBLOCK(1,2,edi,SIZEOF_FAST_FLOAT)], mm4
        movq    MMWORD [MMBLOCK(1,3,edi,SIZEOF_FAST_FLOAT)], mm1

        add     esi, byte 2*SIZEOF_JSAMPROW
        add     edi, byte 2*DCTSIZE*SIZEOF_FAST_FLOAT
        dec     ecx
        jnz     near .convloop

        femms           ; empty MMX/3DNow! state

        pop     edi
        pop     esi
;       pop     edx             ; need not be preserved
;       pop     ecx             ; need not be preserved
        pop     ebx
        pop     ebp
        ret


; --------------------------------------------------------------------------
;
; Quantize/descale the coefficients, and store into coef_block
;
; GLOBAL(void)
; jsimd_quantize_float_3dnow (JCOEFPTR coef_block, FAST_FLOAT *divisors,
;                             FAST_FLOAT *workspace);
;

%define coef_block      ebp+8           ; JCOEFPTR coef_block
%define divisors        ebp+12          ; FAST_FLOAT *divisors
%define workspace       ebp+16          ; FAST_FLOAT *workspace

        align   16
        global  EXTN(jsimd_quantize_float_3dnow) PRIVATE

EXTN(jsimd_quantize_float_3dnow):
        push    ebp
        mov     ebp,esp
;       push    ebx             ; unused
;       push    ecx             ; unused
;       push    edx             ; need not be preserved
        push    esi
        push    edi

        mov       eax, 0x4B400000       ; (float)0x00C00000 (rndint_magic)
        movd      mm7,eax
        punpckldq mm7,mm7               ; mm7={12582912.0F 12582912.0F}

        mov     esi, POINTER [workspace]
        mov     edx, POINTER [divisors]
        mov     edi, JCOEFPTR [coef_block]
        mov     eax, DCTSIZE2/16
        alignx  16,7
.quantloop:
        movq    mm0, MMWORD [MMBLOCK(0,0,esi,SIZEOF_FAST_FLOAT)]
        movq    mm1, MMWORD [MMBLOCK(0,1,esi,SIZEOF_FAST_FLOAT)]
        pfmul   mm0, MMWORD [MMBLOCK(0,0,edx,SIZEOF_FAST_FLOAT)]
        pfmul   mm1, MMWORD [MMBLOCK(0,1,edx,SIZEOF_FAST_FLOAT)]
        movq    mm2, MMWORD [MMBLOCK(0,2,esi,SIZEOF_FAST_FLOAT)]
        movq    mm3, MMWORD [MMBLOCK(0,3,esi,SIZEOF_FAST_FLOAT)]
        pfmul   mm2, MMWORD [MMBLOCK(0,2,edx,SIZEOF_FAST_FLOAT)]
        pfmul   mm3, MMWORD [MMBLOCK(0,3,edx,SIZEOF_FAST_FLOAT)]

        pfadd   mm0,mm7                 ; mm0=(00 ** 01 **)
        pfadd   mm1,mm7                 ; mm1=(02 ** 03 **)
        pfadd   mm2,mm7                 ; mm0=(04 ** 05 **)
        pfadd   mm3,mm7                 ; mm1=(06 ** 07 **)

        movq      mm4,mm0
        punpcklwd mm0,mm1               ; mm0=(00 02 ** **)
        punpckhwd mm4,mm1               ; mm4=(01 03 ** **)
        movq      mm5,mm2
        punpcklwd mm2,mm3               ; mm2=(04 06 ** **)
        punpckhwd mm5,mm3               ; mm5=(05 07 ** **)

        punpcklwd mm0,mm4               ; mm0=(00 01 02 03)
        punpcklwd mm2,mm5               ; mm2=(04 05 06 07)

        movq    mm6, MMWORD [MMBLOCK(1,0,esi,SIZEOF_FAST_FLOAT)]
        movq    mm1, MMWORD [MMBLOCK(1,1,esi,SIZEOF_FAST_FLOAT)]
        pfmul   mm6, MMWORD [MMBLOCK(1,0,edx,SIZEOF_FAST_FLOAT)]
        pfmul   mm1, MMWORD [MMBLOCK(1,1,edx,SIZEOF_FAST_FLOAT)]
        movq    mm3, MMWORD [MMBLOCK(1,2,esi,SIZEOF_FAST_FLOAT)]
        movq    mm4, MMWORD [MMBLOCK(1,3,esi,SIZEOF_FAST_FLOAT)]
        pfmul   mm3, MMWORD [MMBLOCK(1,2,edx,SIZEOF_FAST_FLOAT)]
        pfmul   mm4, MMWORD [MMBLOCK(1,3,edx,SIZEOF_FAST_FLOAT)]

        pfadd   mm6,mm7                 ; mm0=(10 ** 11 **)
        pfadd   mm1,mm7                 ; mm4=(12 ** 13 **)
        pfadd   mm3,mm7                 ; mm0=(14 ** 15 **)
        pfadd   mm4,mm7                 ; mm4=(16 ** 17 **)

        movq      mm5,mm6
        punpcklwd mm6,mm1               ; mm6=(10 12 ** **)
        punpckhwd mm5,mm1               ; mm5=(11 13 ** **)
        movq      mm1,mm3
        punpcklwd mm3,mm4               ; mm3=(14 16 ** **)
        punpckhwd mm1,mm4               ; mm1=(15 17 ** **)

        punpcklwd mm6,mm5               ; mm6=(10 11 12 13)
        punpcklwd mm3,mm1               ; mm3=(14 15 16 17)

        movq    MMWORD [MMBLOCK(0,0,edi,SIZEOF_JCOEF)], mm0
        movq    MMWORD [MMBLOCK(0,1,edi,SIZEOF_JCOEF)], mm2
        movq    MMWORD [MMBLOCK(1,0,edi,SIZEOF_JCOEF)], mm6
        movq    MMWORD [MMBLOCK(1,1,edi,SIZEOF_JCOEF)], mm3

        add     esi, byte 16*SIZEOF_FAST_FLOAT
        add     edx, byte 16*SIZEOF_FAST_FLOAT
        add     edi, byte 16*SIZEOF_JCOEF
        dec     eax
        jnz     near .quantloop

        femms           ; empty MMX/3DNow! state

        pop     edi
        pop     esi
;       pop     edx             ; need not be preserved
;       pop     ecx             ; unused
;       pop     ebx             ; unused
        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
