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comparison decoders/libmpg123/decode_i586_dither.S @ 562:7e08477b0fc1

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MP3 decoder upgrade work. Ripped out SMPEG and mpglib support, replaced it with "mpg123.c" and libmpg123. libmpg123 is a much better version of mpglib, so it should solve all the problems about MP3's not seeking, or most modern MP3's not playing at all, etc. Since you no longer have to make a tradeoff with SMPEG for features, and SMPEG is basically rotting, I removed it from the project. There is still work to be done with libmpg123...there are MMX, 3DNow, SSE, Altivec, etc decoders which we don't have enabled at the moment, and the build system could use some work to make this compile more cleanly, etc. Still: huge win.
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 30 Jan 2009 02:44:47 -0500
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561:f2985e08589c 562:7e08477b0fc1
1 /*
2 decode_i586_dither: asm synth with dither noise
3
4 copyright ?-2007 by the mpg123 project - free software under the terms of the LGPL 2.1
5 see COPYING and AUTHORS files in distribution or http://mpg123.org
6 initially written by Stefan Bieschewski as decode_i586.s without dither
7
8 This version uses "circular" 64k dither noise.
9 (Patch by Adrian <adrian.bacon@xs4all.nl>)
10
11 Thomas learned something about assembler and the stack while making this one thread safe (removing static data).
12 */
13
14 #include "mangle.h"
15
16 .data
17 #ifndef __APPLE__
18 .section .rodata
19 #endif
20 ALIGN8
21 .LC0:
22 .long 0x0,0x40dfffc0
23 ALIGN8
24 .LC1:
25 .long 0x0,0xc0e00000
26 ALIGN8
27 .text
28 /* int synth_1to1_i586_asm_dither(real *bandPtr, int channel, unsigned char *out, unsigned char *buffs, int bo_and_ditherindex[2], real *decwin); */
29 .globl ASM_NAME(synth_1to1_i586_asm_dither)
30 ASM_NAME(synth_1to1_i586_asm_dither):
31 subl $16,%esp
32 pushl %ebp
33 pushl %edi
34 pushl %esi
35 pushl %ebx
36 /* stack: 0(%esp)=%ebx 4=esi 8=edi 12=ebp 16,20,24,28=local 32=back 36=bandptr 40=channel 44=out 48=buffs 52=bo 56=decwin */
37 #define BANDPTR 36(%esp)
38 #define CHANNEL 40(%esp)
39 #define OUT 44(%esp)
40 #define BUFFS 48(%esp)
41 #define BO 52(%esp)
42 #define DECWIN 56(%esp)
43 #define LOC0 16(%esp)
44 #define LOC1 20(%esp)
45 #define LOC2 24(%esp)
46 #define DITHERINDEX 28(%esp)
47 movl BANDPTR,%eax
48 movl OUT,%esi
49 movl BO, %ebx
50 movl (%ebx),%ebp /* get bo value */
51 movl 4(%ebx),%edi; /* get the ditherindex behind bo */
52 movl %edi,DITHERINDEX
53 xorl %edi,%edi
54 cmpl %edi,CHANNEL
55 jne .L48
56 decl %ebp
57 andl $15,%ebp
58 movl %ebp,(%ebx) /* save bo back */
59 movl BUFFS,%ecx
60 jmp .L49
61 .L48:
62 /* In stereo mode , "rewind" dither pointer 32 samples , so 2nd channel */
63 /* has same dither values. Tested OK for mono and stereo MP2 and MP3 */
64 subl $128,DITHERINDEX /* better move to %edi for the two calculations? */
65 andl $0x0003fffc,DITHERINDEX
66 addl $2,%esi
67 movl BUFFS,%ecx
68 addl $2176,%ecx
69 .L49:
70 /* now the call of dct64 is prepared, stuff pushed to the stack, but soon after it's removed again */
71 testl $1,%ebp
72 je .L50
73 movl %ecx,%ebx
74 movl %ebp,LOC0
75 pushl %eax
76 movl LOC1,%edx
77 leal (%ebx,%edx,4),%eax
78 pushl %eax
79 movl LOC2,%eax
80 incl %eax
81 andl $15,%eax
82 leal 1088(,%eax,4),%eax
83 addl %ebx,%eax
84 jmp .L74
85 .L50:
86 leal 1088(%ecx),%ebx
87 leal 1(%ebp),%edx
88 movl %edx,LOC0
89 pushl %eax
90 leal 1092(%ecx,%ebp,4),%eax
91 pushl %eax
92 leal (%ecx,%ebp,4),%eax
93 .L74:
94 pushl %eax
95 call ASM_NAME(dct64_i386)
96 addl $12,%esp
97 /* Now removed the parameters.
98 stack: 0(%esp)=%ebx 4=esi 8=edi 12=ebp 16,20,24,28=local 32=back 36=bandptr 40=channel 44=out 48=buffs 52=bo */
99 movl LOC0,%edx
100 leal 0(,%edx,4),%edx
101 /* movl $ASM_NAME(decwin)+64,%eax */
102 movl DECWIN,%eax
103 addl $64,%eax
104 movl %eax,%ecx
105 subl %edx,%ecx
106 movl $16,%ebp
107 .L55:
108 flds (%ecx)
109 fmuls (%ebx)
110 flds 4(%ecx)
111 fmuls 4(%ebx)
112 fxch %st(1)
113 flds 8(%ecx)
114 fmuls 8(%ebx)
115 fxch %st(2)
116 fsubrp %st,%st(1)
117 flds 12(%ecx)
118 fmuls 12(%ebx)
119 fxch %st(2)
120 faddp %st,%st(1)
121 flds 16(%ecx)
122 fmuls 16(%ebx)
123 fxch %st(2)
124 fsubrp %st,%st(1)
125 flds 20(%ecx)
126 fmuls 20(%ebx)
127 fxch %st(2)
128 faddp %st,%st(1)
129 flds 24(%ecx)
130 fmuls 24(%ebx)
131 fxch %st(2)
132 fsubrp %st,%st(1)
133 flds 28(%ecx)
134 fmuls 28(%ebx)
135 fxch %st(2)
136 faddp %st,%st(1)
137 flds 32(%ecx)
138 fmuls 32(%ebx)
139 fxch %st(2)
140 fsubrp %st,%st(1)
141 flds 36(%ecx)
142 fmuls 36(%ebx)
143 fxch %st(2)
144 faddp %st,%st(1)
145 flds 40(%ecx)
146 fmuls 40(%ebx)
147 fxch %st(2)
148 fsubrp %st,%st(1)
149 flds 44(%ecx)
150 fmuls 44(%ebx)
151 fxch %st(2)
152 faddp %st,%st(1)
153 flds 48(%ecx)
154 fmuls 48(%ebx)
155 fxch %st(2)
156 fsubrp %st,%st(1)
157 flds 52(%ecx)
158 fmuls 52(%ebx)
159 fxch %st(2)
160 faddp %st,%st(1)
161 flds 56(%ecx)
162 fmuls 56(%ebx)
163 fxch %st(2)
164 fsubrp %st,%st(1)
165 flds 60(%ecx)
166 fmuls 60(%ebx)
167 fxch %st(2)
168 subl $4,%esp
169 faddp %st,%st(1)
170 fxch %st(1)
171 fsubrp %st,%st(1)
172
173 addl $4,DITHERINDEX
174 andl $0x0003fffc,DITHERINDEX
175 movl $ASM_NAME(dithernoise),%edi
176 addl DITHERINDEX,%edi
177
178 fadd (%edi)
179
180 /* fistpl and popl as a unit keep the stack unchanged */
181 fistpl (%esp)
182 popl %eax
183 cmpl $32767,%eax
184 jg 1f
185 cmpl $-32768,%eax
186 jl 2f
187 movw %ax,(%esi)
188 jmp 4f
189 1: movw $32767,(%esi)
190 jmp 3f
191 2: movw $-32768,(%esi)
192 3:
193 /* incl %edi */
194 4:
195 .L54:
196 addl $64,%ebx
197 subl $-128,%ecx
198 addl $4,%esi
199 decl %ebp
200 jnz .L55
201 flds (%ecx)
202 fmuls (%ebx)
203 flds 8(%ecx)
204 fmuls 8(%ebx)
205 flds 16(%ecx)
206 fmuls 16(%ebx)
207 fxch %st(2)
208 faddp %st,%st(1)
209 flds 24(%ecx)
210 fmuls 24(%ebx)
211 fxch %st(2)
212 faddp %st,%st(1)
213 flds 32(%ecx)
214 fmuls 32(%ebx)
215 fxch %st(2)
216 faddp %st,%st(1)
217 flds 40(%ecx)
218 fmuls 40(%ebx)
219 fxch %st(2)
220 faddp %st,%st(1)
221 flds 48(%ecx)
222 fmuls 48(%ebx)
223 fxch %st(2)
224 faddp %st,%st(1)
225 flds 56(%ecx)
226 fmuls 56(%ebx)
227 fxch %st(2)
228 subl $4,%esp
229 faddp %st,%st(1)
230 fxch %st(1)
231 faddp %st,%st(1)
232
233 addl $4,DITHERINDEX
234 andl $0x0003fffc,DITHERINDEX
235 movl $ASM_NAME(dithernoise),%edi
236 addl DITHERINDEX,%edi
237
238 fadd (%edi)
239 /* fistpl and popl as a unit keep the stack unchanged */
240 fistpl (%esp)
241 popl %eax
242 cmpl $32767,%eax
243 jg 1f
244 cmpl $-32768,%eax
245 jl 2f
246 movw %ax,(%esi)
247 jmp 4f
248 1: movw $32767,(%esi)
249 jmp 3f
250 2: movw $-32768,(%esi)
251 3:
252 /* incl %edi */
253 4:
254 .L62:
255 addl $-64,%ebx
256 addl $4,%esi
257 movl LOC0,%edx
258 leal -128(%ecx,%edx,8),%ecx
259 movl $15,%ebp
260 .L68:
261 flds -4(%ecx)
262 fchs
263 fmuls (%ebx)
264 flds -8(%ecx)
265 fmuls 4(%ebx)
266 fxch %st(1)
267 flds -12(%ecx)
268 fmuls 8(%ebx)
269 fxch %st(2)
270 fsubrp %st,%st(1)
271 flds -16(%ecx)
272 fmuls 12(%ebx)
273 fxch %st(2)
274 fsubrp %st,%st(1)
275 flds -20(%ecx)
276 fmuls 16(%ebx)
277 fxch %st(2)
278 fsubrp %st,%st(1)
279 flds -24(%ecx)
280 fmuls 20(%ebx)
281 fxch %st(2)
282 fsubrp %st,%st(1)
283 flds -28(%ecx)
284 fmuls 24(%ebx)
285 fxch %st(2)
286 fsubrp %st,%st(1)
287 flds -32(%ecx)
288 fmuls 28(%ebx)
289 fxch %st(2)
290 fsubrp %st,%st(1)
291 flds -36(%ecx)
292 fmuls 32(%ebx)
293 fxch %st(2)
294 fsubrp %st,%st(1)
295 flds -40(%ecx)
296 fmuls 36(%ebx)
297 fxch %st(2)
298 fsubrp %st,%st(1)
299 flds -44(%ecx)
300 fmuls 40(%ebx)
301 fxch %st(2)
302 fsubrp %st,%st(1)
303 flds -48(%ecx)
304 fmuls 44(%ebx)
305 fxch %st(2)
306 fsubrp %st,%st(1)
307 flds -52(%ecx)
308 fmuls 48(%ebx)
309 fxch %st(2)
310 fsubrp %st,%st(1)
311 flds -56(%ecx)
312 fmuls 52(%ebx)
313 fxch %st(2)
314 fsubrp %st,%st(1)
315 flds -60(%ecx)
316 fmuls 56(%ebx)
317 fxch %st(2)
318 fsubrp %st,%st(1)
319 flds (%ecx)
320 fmuls 60(%ebx)
321 fxch %st(2)
322 subl $4,%esp
323 fsubrp %st,%st(1)
324 fxch %st(1)
325 fsubrp %st,%st(1)
326
327 addl $4,DITHERINDEX
328 andl $0x0003fffc,DITHERINDEX
329 movl $ASM_NAME(dithernoise),%edi
330 addl DITHERINDEX,%edi
331
332 fadd (%edi)
333 /* fistpl and popl as a unit keep the stack unchanged */
334 fistpl (%esp)
335 popl %eax
336 cmpl $32767,%eax
337 jg 1f
338 cmpl $-32768,%eax
339 jl 2f
340 movw %ax,(%esi)
341 jmp 4f
342 1: movw $32767,(%esi)
343 jmp 3f
344 2: movw $-32768,(%esi)
345 3:
346 /* incl %edi */
347 4:
348 .L67:
349 addl $-64,%ebx
350 addl $-128,%ecx
351 addl $4,%esi
352 decl %ebp
353 jnz .L68
354 /* return ipv edi 0 in eax */
355 movl $0,%eax
356 /* save ditherindex */
357 movl BO,%ebx
358 movl DITHERINDEX,%esi
359 movl %esi,4(%ebx);
360 /* stack: 0=ebx 4=esi 8=edi 12=ebp 16,20,24,28=local 32=back 36=bandptr 40=channel 44=out 48=buffs 52=bo */
361 popl %ebx
362 popl %esi
363 popl %edi
364 popl %ebp
365 addl $16,%esp
366 /* The stack must be now: 0=back 4=bandptr 8=channel 12=out 16=buffs 20=bo */
367 ret
368
369 /* Mark non-executable stack. */
370 #if defined(__linux__) && defined(__ELF__)
371 .section .note.GNU-stack,"",%progbits
372 #endif