Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 592 insertions, 0 deletions

diff --git a/media/libjpeg/simd/i386/jidctred-sse2.asm b/media/libjpeg/simd/i386/jidctred-sse2.asm
new file mode 100644
index 0000000000..6e56494e97
--- /dev/null
+++ b/media/libjpeg/simd/i386/jidctred-sse2.asm
@@ -0,0 +1,592 @@
+;
+; jidctred.asm - reduced-size IDCT (SSE2)
+;
+; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
+; Copyright (C) 2016, D. R. Commander.
+;
+; Based on the 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 inverse-DCT routines that produce reduced-size
+; output: either 4x4 or 2x2 pixels from an 8x8 DCT block.
+; The following code is based directly on the IJG's original jidctred.c;
+; see the jidctred.c for more details.
+
+%include "jsimdext.inc"
+%include "jdct.inc"
+
+; --------------------------------------------------------------------------
+
+%define CONST_BITS    13
+%define PASS1_BITS    2
+
+%define DESCALE_P1_4  (CONST_BITS - PASS1_BITS + 1)
+%define DESCALE_P2_4  (CONST_BITS + PASS1_BITS + 3 + 1)
+%define DESCALE_P1_2  (CONST_BITS - PASS1_BITS + 2)
+%define DESCALE_P2_2  (CONST_BITS + PASS1_BITS + 3 + 2)
+
+%if CONST_BITS == 13
+F_0_211 equ  1730  ; FIX(0.211164243)
+F_0_509 equ  4176  ; FIX(0.509795579)
+F_0_601 equ  4926  ; FIX(0.601344887)
+F_0_720 equ  5906  ; FIX(0.720959822)
+F_0_765 equ  6270  ; FIX(0.765366865)
+F_0_850 equ  6967  ; FIX(0.850430095)
+F_0_899 equ  7373  ; FIX(0.899976223)
+F_1_061 equ  8697  ; FIX(1.061594337)
+F_1_272 equ 10426  ; FIX(1.272758580)
+F_1_451 equ 11893  ; FIX(1.451774981)
+F_1_847 equ 15137  ; FIX(1.847759065)
+F_2_172 equ 17799  ; FIX(2.172734803)
+F_2_562 equ 20995  ; FIX(2.562915447)
+F_3_624 equ 29692  ; FIX(3.624509785)
+%else
+; NASM cannot do compile-time arithmetic on floating-point constants.
+%define DESCALE(x, n)  (((x) + (1 << ((n) - 1))) >> (n))
+F_0_211 equ DESCALE( 226735879, 30 - CONST_BITS)  ; FIX(0.211164243)
+F_0_509 equ DESCALE( 547388834, 30 - CONST_BITS)  ; FIX(0.509795579)
+F_0_601 equ DESCALE( 645689155, 30 - CONST_BITS)  ; FIX(0.601344887)
+F_0_720 equ DESCALE( 774124714, 30 - CONST_BITS)  ; FIX(0.720959822)
+F_0_765 equ DESCALE( 821806413, 30 - CONST_BITS)  ; FIX(0.765366865)
+F_0_850 equ DESCALE( 913142361, 30 - CONST_BITS)  ; FIX(0.850430095)
+F_0_899 equ DESCALE( 966342111, 30 - CONST_BITS)  ; FIX(0.899976223)
+F_1_061 equ DESCALE(1139878239, 30 - CONST_BITS)  ; FIX(1.061594337)
+F_1_272 equ DESCALE(1366614119, 30 - CONST_BITS)  ; FIX(1.272758580)
+F_1_451 equ DESCALE(1558831516, 30 - CONST_BITS)  ; FIX(1.451774981)
+F_1_847 equ DESCALE(1984016188, 30 - CONST_BITS)  ; FIX(1.847759065)
+F_2_172 equ DESCALE(2332956230, 30 - CONST_BITS)  ; FIX(2.172734803)
+F_2_562 equ DESCALE(2751909506, 30 - CONST_BITS)  ; FIX(2.562915447)
+F_3_624 equ DESCALE(3891787747, 30 - CONST_BITS)  ; FIX(3.624509785)
+%endif
+
+; --------------------------------------------------------------------------
+    SECTION     SEG_CONST
+
+    alignz      32
+    GLOBAL_DATA(jconst_idct_red_sse2)
+
+EXTN(jconst_idct_red_sse2):
+
+PW_F184_MF076   times 4  dw  F_1_847, -F_0_765
+PW_F256_F089    times 4  dw  F_2_562,  F_0_899
+PW_F106_MF217   times 4  dw  F_1_061, -F_2_172
+PW_MF060_MF050  times 4  dw -F_0_601, -F_0_509
+PW_F145_MF021   times 4  dw  F_1_451, -F_0_211
+PW_F362_MF127   times 4  dw  F_3_624, -F_1_272
+PW_F085_MF072   times 4  dw  F_0_850, -F_0_720
+PD_DESCALE_P1_4 times 4  dd  1 << (DESCALE_P1_4 - 1)
+PD_DESCALE_P2_4 times 4  dd  1 << (DESCALE_P2_4 - 1)
+PD_DESCALE_P1_2 times 4  dd  1 << (DESCALE_P1_2 - 1)
+PD_DESCALE_P2_2 times 4  dd  1 << (DESCALE_P2_2 - 1)
+PB_CENTERJSAMP  times 16 db  CENTERJSAMPLE
+
+    alignz      32
+
+; --------------------------------------------------------------------------
+    SECTION     SEG_TEXT
+    BITS        32
+;
+; Perform dequantization and inverse DCT on one block of coefficients,
+; producing a reduced-size 4x4 output block.
+;
+; GLOBAL(void)
+; jsimd_idct_4x4_sse2(void *dct_table, JCOEFPTR coef_block,
+;                     JSAMPARRAY output_buf, JDIMENSION output_col)
+;
+
+%define dct_table(b)   (b) + 8          ; void *dct_table
+%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_XMMWORD
+                                        ; xmmword wk[WK_NUM]
+%define WK_NUM         2
+
+    align       32
+    GLOBAL_FUNCTION(jsimd_idct_4x4_sse2)
+
+EXTN(jsimd_idct_4x4_sse2):
+    push        ebp
+    mov         eax, esp                     ; eax = original ebp
+    sub         esp, byte 4
+    and         esp, byte (-SIZEOF_XMMWORD)  ; align to 128 bits
+    mov         [esp], eax
+    mov         ebp, esp                     ; ebp = aligned ebp
+    lea         esp, [wk(0)]
+    pushpic     ebx
+;   push        ecx                     ; unused
+;   push        edx                     ; need not be preserved
+    push        esi
+    push        edi
+
+    get_GOT     ebx                     ; get GOT address
+
+    ; ---- Pass 1: process columns from input.
+
+;   mov         eax, [original_ebp]
+    mov         edx, POINTER [dct_table(eax)]    ; quantptr
+    mov         esi, JCOEFPTR [coef_block(eax)]  ; inptr
+
+%ifndef NO_ZERO_COLUMN_TEST_4X4_SSE2
+    mov         eax, dword [DWBLOCK(1,0,esi,SIZEOF_JCOEF)]
+    or          eax, dword [DWBLOCK(2,0,esi,SIZEOF_JCOEF)]
+    jnz         short .columnDCT
+
+    movdqa      xmm0, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_JCOEF)]
+    movdqa      xmm1, XMMWORD [XMMBLOCK(2,0,esi,SIZEOF_JCOEF)]
+    por         xmm0, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_JCOEF)]
+    por         xmm1, XMMWORD [XMMBLOCK(5,0,esi,SIZEOF_JCOEF)]
+    por         xmm0, XMMWORD [XMMBLOCK(6,0,esi,SIZEOF_JCOEF)]
+    por         xmm1, XMMWORD [XMMBLOCK(7,0,esi,SIZEOF_JCOEF)]
+    por         xmm0, xmm1
+    packsswb    xmm0, xmm0
+    packsswb    xmm0, xmm0
+    movd        eax, xmm0
+    test        eax, eax
+    jnz         short .columnDCT
+
+    ; -- AC terms all zero
+
+    movdqa      xmm0, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_JCOEF)]
+    pmullw      xmm0, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+
+    psllw       xmm0, PASS1_BITS
+
+    movdqa      xmm3, xmm0        ; xmm0=in0=(00 01 02 03 04 05 06 07)
+    punpcklwd   xmm0, xmm0        ; xmm0=(00 00 01 01 02 02 03 03)
+    punpckhwd   xmm3, xmm3        ; xmm3=(04 04 05 05 06 06 07 07)
+
+    pshufd      xmm1, xmm0, 0x50  ; xmm1=[col0 col1]=(00 00 00 00 01 01 01 01)
+    pshufd      xmm0, xmm0, 0xFA  ; xmm0=[col2 col3]=(02 02 02 02 03 03 03 03)
+    pshufd      xmm6, xmm3, 0x50  ; xmm6=[col4 col5]=(04 04 04 04 05 05 05 05)
+    pshufd      xmm3, xmm3, 0xFA  ; xmm3=[col6 col7]=(06 06 06 06 07 07 07 07)
+
+    jmp         near .column_end
+    alignx      16, 7
+%endif
+.columnDCT:
+
+    ; -- Odd part
+
+    movdqa      xmm0, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_JCOEF)]
+    movdqa      xmm1, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_JCOEF)]
+    pmullw      xmm0, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    pmullw      xmm1, XMMWORD [XMMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    movdqa      xmm2, XMMWORD [XMMBLOCK(5,0,esi,SIZEOF_JCOEF)]
+    movdqa      xmm3, XMMWORD [XMMBLOCK(7,0,esi,SIZEOF_JCOEF)]
+    pmullw      xmm2, XMMWORD [XMMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    pmullw      xmm3, XMMWORD [XMMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+
+    movdqa      xmm4, xmm0
+    movdqa      xmm5, xmm0
+    punpcklwd   xmm4, xmm1
+    punpckhwd   xmm5, xmm1
+    movdqa      xmm0, xmm4
+    movdqa      xmm1, xmm5
+    pmaddwd     xmm4, [GOTOFF(ebx,PW_F256_F089)]   ; xmm4=(tmp2L)
+    pmaddwd     xmm5, [GOTOFF(ebx,PW_F256_F089)]   ; xmm5=(tmp2H)
+    pmaddwd     xmm0, [GOTOFF(ebx,PW_F106_MF217)]  ; xmm0=(tmp0L)
+    pmaddwd     xmm1, [GOTOFF(ebx,PW_F106_MF217)]  ; xmm1=(tmp0H)
+
+    movdqa      xmm6, xmm2
+    movdqa      xmm7, xmm2
+    punpcklwd   xmm6, xmm3
+    punpckhwd   xmm7, xmm3
+    movdqa      xmm2, xmm6
+    movdqa      xmm3, xmm7
+    pmaddwd     xmm6, [GOTOFF(ebx,PW_MF060_MF050)]  ; xmm6=(tmp2L)
+    pmaddwd     xmm7, [GOTOFF(ebx,PW_MF060_MF050)]  ; xmm7=(tmp2H)
+    pmaddwd     xmm2, [GOTOFF(ebx,PW_F145_MF021)]   ; xmm2=(tmp0L)
+    pmaddwd     xmm3, [GOTOFF(ebx,PW_F145_MF021)]   ; xmm3=(tmp0H)
+
+    paddd       xmm6, xmm4              ; xmm6=tmp2L
+    paddd       xmm7, xmm5              ; xmm7=tmp2H
+    paddd       xmm2, xmm0              ; xmm2=tmp0L
+    paddd       xmm3, xmm1              ; xmm3=tmp0H
+
+    movdqa      XMMWORD [wk(0)], xmm2   ; wk(0)=tmp0L
+    movdqa      XMMWORD [wk(1)], xmm3   ; wk(1)=tmp0H
+
+    ; -- Even part
+
+    movdqa      xmm4, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_JCOEF)]
+    movdqa      xmm5, XMMWORD [XMMBLOCK(2,0,esi,SIZEOF_JCOEF)]
+    movdqa      xmm0, XMMWORD [XMMBLOCK(6,0,esi,SIZEOF_JCOEF)]
+    pmullw      xmm4, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    pmullw      xmm5, XMMWORD [XMMBLOCK(2,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    pmullw      xmm0, XMMWORD [XMMBLOCK(6,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+
+    pxor        xmm1, xmm1
+    pxor        xmm2, xmm2
+    punpcklwd   xmm1, xmm4               ; xmm1=tmp0L
+    punpckhwd   xmm2, xmm4               ; xmm2=tmp0H
+    psrad       xmm1, (16-CONST_BITS-1)  ; psrad xmm1,16 & pslld xmm1,CONST_BITS+1
+    psrad       xmm2, (16-CONST_BITS-1)  ; psrad xmm2,16 & pslld xmm2,CONST_BITS+1
+
+    movdqa      xmm3, xmm5              ; xmm5=in2=z2
+    punpcklwd   xmm5, xmm0              ; xmm0=in6=z3
+    punpckhwd   xmm3, xmm0
+    pmaddwd     xmm5, [GOTOFF(ebx,PW_F184_MF076)]  ; xmm5=tmp2L
+    pmaddwd     xmm3, [GOTOFF(ebx,PW_F184_MF076)]  ; xmm3=tmp2H
+
+    movdqa      xmm4, xmm1
+    movdqa      xmm0, xmm2
+    paddd       xmm1, xmm5              ; xmm1=tmp10L
+    paddd       xmm2, xmm3              ; xmm2=tmp10H
+    psubd       xmm4, xmm5              ; xmm4=tmp12L
+    psubd       xmm0, xmm3              ; xmm0=tmp12H
+
+    ; -- Final output stage
+
+    movdqa      xmm5, xmm1
+    movdqa      xmm3, xmm2
+    paddd       xmm1, xmm6              ; xmm1=data0L
+    paddd       xmm2, xmm7              ; xmm2=data0H
+    psubd       xmm5, xmm6              ; xmm5=data3L
+    psubd       xmm3, xmm7              ; xmm3=data3H
+
+    movdqa      xmm6, [GOTOFF(ebx,PD_DESCALE_P1_4)]  ; xmm6=[PD_DESCALE_P1_4]
+
+    paddd       xmm1, xmm6
+    paddd       xmm2, xmm6
+    psrad       xmm1, DESCALE_P1_4
+    psrad       xmm2, DESCALE_P1_4
+    paddd       xmm5, xmm6
+    paddd       xmm3, xmm6
+    psrad       xmm5, DESCALE_P1_4
+    psrad       xmm3, DESCALE_P1_4
+
+    packssdw    xmm1, xmm2              ; xmm1=data0=(00 01 02 03 04 05 06 07)
+    packssdw    xmm5, xmm3              ; xmm5=data3=(30 31 32 33 34 35 36 37)
+
+    movdqa      xmm7, XMMWORD [wk(0)]   ; xmm7=tmp0L
+    movdqa      xmm6, XMMWORD [wk(1)]   ; xmm6=tmp0H
+
+    movdqa      xmm2, xmm4
+    movdqa      xmm3, xmm0
+    paddd       xmm4, xmm7              ; xmm4=data1L
+    paddd       xmm0, xmm6              ; xmm0=data1H
+    psubd       xmm2, xmm7              ; xmm2=data2L
+    psubd       xmm3, xmm6              ; xmm3=data2H
+
+    movdqa      xmm7, [GOTOFF(ebx,PD_DESCALE_P1_4)]  ; xmm7=[PD_DESCALE_P1_4]
+
+    paddd       xmm4, xmm7
+    paddd       xmm0, xmm7
+    psrad       xmm4, DESCALE_P1_4
+    psrad       xmm0, DESCALE_P1_4
+    paddd       xmm2, xmm7
+    paddd       xmm3, xmm7
+    psrad       xmm2, DESCALE_P1_4
+    psrad       xmm3, DESCALE_P1_4
+
+    packssdw    xmm4, xmm0        ; xmm4=data1=(10 11 12 13 14 15 16 17)
+    packssdw    xmm2, xmm3        ; xmm2=data2=(20 21 22 23 24 25 26 27)
+
+    movdqa      xmm6, xmm1        ; transpose coefficients(phase 1)
+    punpcklwd   xmm1, xmm4        ; xmm1=(00 10 01 11 02 12 03 13)
+    punpckhwd   xmm6, xmm4        ; xmm6=(04 14 05 15 06 16 07 17)
+    movdqa      xmm7, xmm2        ; transpose coefficients(phase 1)
+    punpcklwd   xmm2, xmm5        ; xmm2=(20 30 21 31 22 32 23 33)
+    punpckhwd   xmm7, xmm5        ; xmm7=(24 34 25 35 26 36 27 37)
+
+    movdqa      xmm0, xmm1        ; transpose coefficients(phase 2)
+    punpckldq   xmm1, xmm2        ; xmm1=[col0 col1]=(00 10 20 30 01 11 21 31)
+    punpckhdq   xmm0, xmm2        ; xmm0=[col2 col3]=(02 12 22 32 03 13 23 33)
+    movdqa      xmm3, xmm6        ; transpose coefficients(phase 2)
+    punpckldq   xmm6, xmm7        ; xmm6=[col4 col5]=(04 14 24 34 05 15 25 35)
+    punpckhdq   xmm3, xmm7        ; xmm3=[col6 col7]=(06 16 26 36 07 17 27 37)
+.column_end:
+
+    ; -- Prefetch the next coefficient block
+
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
+
+    ; ---- Pass 2: process rows, store into output array.
+
+    mov         eax, [original_ebp]
+    mov         edi, JSAMPARRAY [output_buf(eax)]  ; (JSAMPROW *)
+    mov         eax, JDIMENSION [output_col(eax)]
+
+    ; -- Even part
+
+    pxor        xmm4, xmm4
+    punpcklwd   xmm4, xmm1               ; xmm4=tmp0
+    psrad       xmm4, (16-CONST_BITS-1)  ; psrad xmm4,16 & pslld xmm4,CONST_BITS+1
+
+    ; -- Odd part
+
+    punpckhwd   xmm1, xmm0
+    punpckhwd   xmm6, xmm3
+    movdqa      xmm5, xmm1
+    movdqa      xmm2, xmm6
+    pmaddwd     xmm1, [GOTOFF(ebx,PW_F256_F089)]    ; xmm1=(tmp2)
+    pmaddwd     xmm6, [GOTOFF(ebx,PW_MF060_MF050)]  ; xmm6=(tmp2)
+    pmaddwd     xmm5, [GOTOFF(ebx,PW_F106_MF217)]   ; xmm5=(tmp0)
+    pmaddwd     xmm2, [GOTOFF(ebx,PW_F145_MF021)]   ; xmm2=(tmp0)
+
+    paddd       xmm6, xmm1              ; xmm6=tmp2
+    paddd       xmm2, xmm5              ; xmm2=tmp0
+
+    ; -- Even part
+
+    punpcklwd   xmm0, xmm3
+    pmaddwd     xmm0, [GOTOFF(ebx,PW_F184_MF076)]  ; xmm0=tmp2
+
+    movdqa      xmm7, xmm4
+    paddd       xmm4, xmm0              ; xmm4=tmp10
+    psubd       xmm7, xmm0              ; xmm7=tmp12
+
+    ; -- Final output stage
+
+    movdqa      xmm1, [GOTOFF(ebx,PD_DESCALE_P2_4)]  ; xmm1=[PD_DESCALE_P2_4]
+
+    movdqa      xmm5, xmm4
+    movdqa      xmm3, xmm7
+    paddd       xmm4, xmm6              ; xmm4=data0=(00 10 20 30)
+    paddd       xmm7, xmm2              ; xmm7=data1=(01 11 21 31)
+    psubd       xmm5, xmm6              ; xmm5=data3=(03 13 23 33)
+    psubd       xmm3, xmm2              ; xmm3=data2=(02 12 22 32)
+
+    paddd       xmm4, xmm1
+    paddd       xmm7, xmm1
+    psrad       xmm4, DESCALE_P2_4
+    psrad       xmm7, DESCALE_P2_4
+    paddd       xmm5, xmm1
+    paddd       xmm3, xmm1
+    psrad       xmm5, DESCALE_P2_4
+    psrad       xmm3, DESCALE_P2_4
+
+    packssdw    xmm4, xmm3              ; xmm4=(00 10 20 30 02 12 22 32)
+    packssdw    xmm7, xmm5              ; xmm7=(01 11 21 31 03 13 23 33)
+
+    movdqa      xmm0, xmm4              ; transpose coefficients(phase 1)
+    punpcklwd   xmm4, xmm7              ; xmm4=(00 01 10 11 20 21 30 31)
+    punpckhwd   xmm0, xmm7              ; xmm0=(02 03 12 13 22 23 32 33)
+
+    movdqa      xmm6, xmm4              ; transpose coefficients(phase 2)
+    punpckldq   xmm4, xmm0              ; xmm4=(00 01 02 03 10 11 12 13)
+    punpckhdq   xmm6, xmm0              ; xmm6=(20 21 22 23 30 31 32 33)
+
+    packsswb    xmm4, xmm6              ; xmm4=(00 01 02 03 10 11 12 13 20 ..)
+    paddb       xmm4, [GOTOFF(ebx,PB_CENTERJSAMP)]
+
+    pshufd      xmm2, xmm4, 0x39        ; xmm2=(10 11 12 13 20 21 22 23 30 ..)
+    pshufd      xmm1, xmm4, 0x4E        ; xmm1=(20 21 22 23 30 31 32 33 00 ..)
+    pshufd      xmm3, xmm4, 0x93        ; xmm3=(30 31 32 33 00 01 02 03 10 ..)
+
+    mov         edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
+    mov         esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
+    movd        XMM_DWORD [edx+eax*SIZEOF_JSAMPLE], xmm4
+    movd        XMM_DWORD [esi+eax*SIZEOF_JSAMPLE], xmm2
+    mov         edx, JSAMPROW [edi+2*SIZEOF_JSAMPROW]
+    mov         esi, JSAMPROW [edi+3*SIZEOF_JSAMPROW]
+    movd        XMM_DWORD [edx+eax*SIZEOF_JSAMPLE], xmm1
+    movd        XMM_DWORD [esi+eax*SIZEOF_JSAMPLE], xmm3
+
+    pop         edi
+    pop         esi
+;   pop         edx                     ; need not be preserved
+;   pop         ecx                     ; unused
+    poppic      ebx
+    mov         esp, ebp                ; esp <- aligned ebp
+    pop         esp                     ; esp <- original ebp
+    pop         ebp
+    ret
+
+; --------------------------------------------------------------------------
+;
+; Perform dequantization and inverse DCT on one block of coefficients,
+; producing a reduced-size 2x2 output block.
+;
+; GLOBAL(void)
+; jsimd_idct_2x2_sse2(void *dct_table, JCOEFPTR coef_block,
+;                     JSAMPARRAY output_buf, JDIMENSION output_col)
+;
+
+%define dct_table(b)   (b) + 8          ; void *dct_table
+%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
+
+    align       32
+    GLOBAL_FUNCTION(jsimd_idct_2x2_sse2)
+
+EXTN(jsimd_idct_2x2_sse2):
+    push        ebp
+    mov         ebp, esp
+    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.
+
+    mov         edx, POINTER [dct_table(ebp)]    ; quantptr
+    mov         esi, JCOEFPTR [coef_block(ebp)]  ; inptr
+
+    ; | input:                  | result:        |
+    ; | 00 01 ** 03 ** 05 ** 07 |                |
+    ; | 10 11 ** 13 ** 15 ** 17 |                |
+    ; | ** ** ** ** ** ** ** ** |                |
+    ; | 30 31 ** 33 ** 35 ** 37 | A0 A1 A3 A5 A7 |
+    ; | ** ** ** ** ** ** ** ** | B0 B1 B3 B5 B7 |
+    ; | 50 51 ** 53 ** 55 ** 57 |                |
+    ; | ** ** ** ** ** ** ** ** |                |
+    ; | 70 71 ** 73 ** 75 ** 77 |                |
+
+    ; -- Odd part
+
+    movdqa      xmm0, XMMWORD [XMMBLOCK(1,0,esi,SIZEOF_JCOEF)]
+    movdqa      xmm1, XMMWORD [XMMBLOCK(3,0,esi,SIZEOF_JCOEF)]
+    pmullw      xmm0, XMMWORD [XMMBLOCK(1,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    pmullw      xmm1, XMMWORD [XMMBLOCK(3,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    movdqa      xmm2, XMMWORD [XMMBLOCK(5,0,esi,SIZEOF_JCOEF)]
+    movdqa      xmm3, XMMWORD [XMMBLOCK(7,0,esi,SIZEOF_JCOEF)]
+    pmullw      xmm2, XMMWORD [XMMBLOCK(5,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+    pmullw      xmm3, XMMWORD [XMMBLOCK(7,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+
+    ; xmm0=(10 11 ** 13 ** 15 ** 17), xmm1=(30 31 ** 33 ** 35 ** 37)
+    ; xmm2=(50 51 ** 53 ** 55 ** 57), xmm3=(70 71 ** 73 ** 75 ** 77)
+
+    pcmpeqd     xmm7, xmm7
+    pslld       xmm7, WORD_BIT          ; xmm7={0x0000 0xFFFF 0x0000 0xFFFF ..}
+
+    movdqa      xmm4, xmm0              ; xmm4=(10 11 ** 13 ** 15 ** 17)
+    movdqa      xmm5, xmm2              ; xmm5=(50 51 ** 53 ** 55 ** 57)
+    punpcklwd   xmm4, xmm1              ; xmm4=(10 30 11 31 ** ** 13 33)
+    punpcklwd   xmm5, xmm3              ; xmm5=(50 70 51 71 ** ** 53 73)
+    pmaddwd     xmm4, [GOTOFF(ebx,PW_F362_MF127)]
+    pmaddwd     xmm5, [GOTOFF(ebx,PW_F085_MF072)]
+
+    psrld       xmm0, WORD_BIT          ; xmm0=(11 -- 13 -- 15 -- 17 --)
+    pand        xmm1, xmm7              ; xmm1=(-- 31 -- 33 -- 35 -- 37)
+    psrld       xmm2, WORD_BIT          ; xmm2=(51 -- 53 -- 55 -- 57 --)
+    pand        xmm3, xmm7              ; xmm3=(-- 71 -- 73 -- 75 -- 77)
+    por         xmm0, xmm1              ; xmm0=(11 31 13 33 15 35 17 37)
+    por         xmm2, xmm3              ; xmm2=(51 71 53 73 55 75 57 77)
+    pmaddwd     xmm0, [GOTOFF(ebx,PW_F362_MF127)]
+    pmaddwd     xmm2, [GOTOFF(ebx,PW_F085_MF072)]
+
+    paddd       xmm4, xmm5              ; xmm4=tmp0[col0 col1 **** col3]
+    paddd       xmm0, xmm2              ; xmm0=tmp0[col1 col3 col5 col7]
+
+    ; -- Even part
+
+    movdqa      xmm6, XMMWORD [XMMBLOCK(0,0,esi,SIZEOF_JCOEF)]
+    pmullw      xmm6, XMMWORD [XMMBLOCK(0,0,edx,SIZEOF_ISLOW_MULT_TYPE)]
+
+    ; xmm6=(00 01 ** 03 ** 05 ** 07)
+
+    movdqa      xmm1, xmm6              ; xmm1=(00 01 ** 03 ** 05 ** 07)
+    pslld       xmm6, WORD_BIT          ; xmm6=(-- 00 -- ** -- ** -- **)
+    pand        xmm1, xmm7              ; xmm1=(-- 01 -- 03 -- 05 -- 07)
+    psrad       xmm6, (WORD_BIT-CONST_BITS-2)  ; xmm6=tmp10[col0 **** **** ****]
+    psrad       xmm1, (WORD_BIT-CONST_BITS-2)  ; xmm1=tmp10[col1 col3 col5 col7]
+
+    ; -- Final output stage
+
+    movdqa      xmm3, xmm6
+    movdqa      xmm5, xmm1
+    paddd       xmm6, xmm4      ; xmm6=data0[col0 **** **** ****]=(A0 ** ** **)
+    paddd       xmm1, xmm0      ; xmm1=data0[col1 col3 col5 col7]=(A1 A3 A5 A7)
+    psubd       xmm3, xmm4      ; xmm3=data1[col0 **** **** ****]=(B0 ** ** **)
+    psubd       xmm5, xmm0      ; xmm5=data1[col1 col3 col5 col7]=(B1 B3 B5 B7)
+
+    movdqa      xmm2, [GOTOFF(ebx,PD_DESCALE_P1_2)]  ; xmm2=[PD_DESCALE_P1_2]
+
+    punpckldq   xmm6, xmm3              ; xmm6=(A0 B0 ** **)
+
+    movdqa      xmm7, xmm1
+    punpcklqdq  xmm1, xmm5              ; xmm1=(A1 A3 B1 B3)
+    punpckhqdq  xmm7, xmm5              ; xmm7=(A5 A7 B5 B7)
+
+    paddd       xmm6, xmm2
+    psrad       xmm6, DESCALE_P1_2
+
+    paddd       xmm1, xmm2
+    paddd       xmm7, xmm2
+    psrad       xmm1, DESCALE_P1_2
+    psrad       xmm7, DESCALE_P1_2
+
+    ; -- Prefetch the next coefficient block
+
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 0*32]
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 1*32]
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 2*32]
+    prefetchnta [esi + DCTSIZE2*SIZEOF_JCOEF + 3*32]
+
+    ; ---- Pass 2: process rows, store into output array.
+
+    mov         edi, JSAMPARRAY [output_buf(ebp)]  ; (JSAMPROW *)
+    mov         eax, JDIMENSION [output_col(ebp)]
+
+    ; | input:| result:|
+    ; | A0 B0 |        |
+    ; | A1 B1 | C0 C1  |
+    ; | A3 B3 | D0 D1  |
+    ; | A5 B5 |        |
+    ; | A7 B7 |        |
+
+    ; -- Odd part
+
+    packssdw    xmm1, xmm1              ; xmm1=(A1 A3 B1 B3 A1 A3 B1 B3)
+    packssdw    xmm7, xmm7              ; xmm7=(A5 A7 B5 B7 A5 A7 B5 B7)
+    pmaddwd     xmm1, [GOTOFF(ebx,PW_F362_MF127)]
+    pmaddwd     xmm7, [GOTOFF(ebx,PW_F085_MF072)]
+
+    paddd       xmm1, xmm7              ; xmm1=tmp0[row0 row1 row0 row1]
+
+    ; -- Even part
+
+    pslld       xmm6, (CONST_BITS+2)    ; xmm6=tmp10[row0 row1 **** ****]
+
+    ; -- Final output stage
+
+    movdqa      xmm4, xmm6
+    paddd       xmm6, xmm1     ; xmm6=data0[row0 row1 **** ****]=(C0 C1 ** **)
+    psubd       xmm4, xmm1     ; xmm4=data1[row0 row1 **** ****]=(D0 D1 ** **)
+
+    punpckldq   xmm6, xmm4     ; xmm6=(C0 D0 C1 D1)
+
+    paddd       xmm6, [GOTOFF(ebx,PD_DESCALE_P2_2)]
+    psrad       xmm6, DESCALE_P2_2
+
+    packssdw    xmm6, xmm6              ; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1)
+    packsswb    xmm6, xmm6              ; xmm6=(C0 D0 C1 D1 C0 D0 C1 D1 ..)
+    paddb       xmm6, [GOTOFF(ebx,PB_CENTERJSAMP)]
+
+    pextrw      ebx, xmm6, 0x00         ; ebx=(C0 D0 -- --)
+    pextrw      ecx, xmm6, 0x01         ; ecx=(C1 D1 -- --)
+
+    mov         edx, JSAMPROW [edi+0*SIZEOF_JSAMPROW]
+    mov         esi, JSAMPROW [edi+1*SIZEOF_JSAMPROW]
+    mov         word [edx+eax*SIZEOF_JSAMPLE], bx
+    mov         word [esi+eax*SIZEOF_JSAMPLE], cx
+
+    pop         edi
+    pop         esi
+;   pop         edx                     ; need not be preserved
+;   pop         ecx                     ; need not be preserved
+    pop         ebx
+    pop         ebp
+    ret
+
+; For some reason, the OS X linker does not honor the request to align the
+; segment unless we do this.
+    align       32