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1 ; | 1 ; |
2 ; jidctint.asm - accurate integer IDCT (MMX) | 2 ; jidctint.asm - accurate integer IDCT (MMX) |
3 ; | 3 ; |
4 ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB | 4 ; Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
5 ; | 5 ; |
6 ; Based on | 6 ; Based on |
7 ; x86 SIMD extension for IJG JPEG library | 7 ; x86 SIMD extension for IJG JPEG library |
8 ; Copyright (C) 1999-2006, MIYASAKA Masaru. | 8 ; Copyright (C) 1999-2006, MIYASAKA Masaru. |
9 ; For conditions of distribution and use, see copyright notice in jsimdext.inc | 9 ; For conditions of distribution and use, see copyright notice in jsimdext.inc |
10 ; | 10 ; |
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59 F_1_961 equ DESCALE(2106220350,30-CONST_BITS) ; FIX(1.961570560) | 59 F_1_961 equ DESCALE(2106220350,30-CONST_BITS) ; FIX(1.961570560) |
60 F_2_053 equ DESCALE(2204520673,30-CONST_BITS) ; FIX(2.053119869) | 60 F_2_053 equ DESCALE(2204520673,30-CONST_BITS) ; FIX(2.053119869) |
61 F_2_562 equ DESCALE(2751909506,30-CONST_BITS) ; FIX(2.562915447) | 61 F_2_562 equ DESCALE(2751909506,30-CONST_BITS) ; FIX(2.562915447) |
62 F_3_072 equ DESCALE(3299298341,30-CONST_BITS) ; FIX(3.072711026) | 62 F_3_072 equ DESCALE(3299298341,30-CONST_BITS) ; FIX(3.072711026) |
63 %endif | 63 %endif |
64 | 64 |
65 ; -------------------------------------------------------------------------- | 65 ; -------------------------------------------------------------------------- |
66 SECTION SEG_CONST | 66 SECTION SEG_CONST |
67 | 67 |
68 alignz 16 | 68 alignz 16 |
69 global EXTN(jconst_idct_islow_mmx) | 69 global EXTN(jconst_idct_islow_mmx) PRIVATE |
70 | 70 |
71 EXTN(jconst_idct_islow_mmx): | 71 EXTN(jconst_idct_islow_mmx): |
72 | 72 |
73 PW_F130_F054 times 2 dw (F_0_541+F_0_765), F_0_541 | 73 PW_F130_F054 times 2 dw (F_0_541+F_0_765), F_0_541 |
74 PW_F054_MF130 times 2 dw F_0_541, (F_0_541-F_1_847) | 74 PW_F054_MF130 times 2 dw F_0_541, (F_0_541-F_1_847) |
75 PW_MF078_F117 times 2 dw (F_1_175-F_1_961), F_1_175 | 75 PW_MF078_F117 times 2 dw (F_1_175-F_1_961), F_1_175 |
76 PW_F117_F078 times 2 dw F_1_175, (F_1_175-F_0_390) | 76 PW_F117_F078 times 2 dw F_1_175, (F_1_175-F_0_390) |
77 PW_MF060_MF089 times 2 dw (F_0_298-F_0_899),-F_0_899 | 77 PW_MF060_MF089 times 2 dw (F_0_298-F_0_899),-F_0_899 |
78 PW_MF089_F060 times 2 dw -F_0_899, (F_1_501-F_0_899) | 78 PW_MF089_F060 times 2 dw -F_0_899, (F_1_501-F_0_899) |
79 PW_MF050_MF256 times 2 dw (F_2_053-F_2_562),-F_2_562 | 79 PW_MF050_MF256 times 2 dw (F_2_053-F_2_562),-F_2_562 |
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100 %define output_buf(b) (b)+16 ; JSAMPARRAY output_buf | 100 %define output_buf(b) (b)+16 ; JSAMPARRAY output_buf |
101 %define output_col(b) (b)+20 ; JDIMENSION output_col | 101 %define output_col(b) (b)+20 ; JDIMENSION output_col |
102 | 102 |
103 %define original_ebp ebp+0 | 103 %define original_ebp ebp+0 |
104 %define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] | 104 %define wk(i) ebp-(WK_NUM-(i))*SIZEOF_MMWORD ; mmword wk[WK_NUM] |
105 %define WK_NUM 12 | 105 %define WK_NUM 12 |
106 %define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF | 106 %define workspace wk(0)-DCTSIZE2*SIZEOF_JCOEF |
107 ; JCOEF workspace[DCTSIZE2] | 107 ; JCOEF workspace[DCTSIZE2] |
108 | 108 |
109 align 16 | 109 align 16 |
110 global EXTN(jsimd_idct_islow_mmx) | 110 global EXTN(jsimd_idct_islow_mmx) PRIVATE |
111 | 111 |
112 EXTN(jsimd_idct_islow_mmx): | 112 EXTN(jsimd_idct_islow_mmx): |
113 push ebp | 113 push ebp |
114 mov eax,esp ; eax = original ebp | 114 mov eax,esp ; eax = original ebp |
115 sub esp, byte 4 | 115 sub esp, byte 4 |
116 and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits | 116 and esp, byte (-SIZEOF_MMWORD) ; align to 64 bits |
117 mov [esp],eax | 117 mov [esp],eax |
118 mov ebp,esp ; ebp = aligned ebp | 118 mov ebp,esp ; ebp = aligned ebp |
119 lea esp, [workspace] | 119 lea esp, [workspace] |
120 push ebx | 120 push ebx |
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843 ; pop ecx ; need not be preserved | 843 ; pop ecx ; need not be preserved |
844 pop ebx | 844 pop ebx |
845 mov esp,ebp ; esp <- aligned ebp | 845 mov esp,ebp ; esp <- aligned ebp |
846 pop esp ; esp <- original ebp | 846 pop esp ; esp <- original ebp |
847 pop ebp | 847 pop ebp |
848 ret | 848 ret |
849 | 849 |
850 ; For some reason, the OS X linker does not honor the request to align the | 850 ; For some reason, the OS X linker does not honor the request to align the |
851 ; segment unless we do this. | 851 ; segment unless we do this. |
852 align 16 | 852 align 16 |
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