source: trunk/minix/lib/zlib-1.2.3/contrib/masmx64/inffasx64.asm@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 10.3 KB
Line 
1; inffasx64.asm is a hand tuned assembler version of inffast.c - fast decoding
2; version for AMD64 on Windows using Microsoft C compiler
3;
4; inffasx64.asm is automatically convert from AMD64 portion of inffas86.c
5; inffasx64.asm is called by inffas8664.c, which contain more info.
6
7
8; to compile this file, I use option
9; ml64.exe /Flinffasx64 /c /Zi inffasx64.asm
10; with Microsoft Macro Assembler (x64) for AMD64
11;
12; ml64.exe is given with Visual Studio 2005, Windows 2003 server DDK
13;
14; (you can get Windows 2003 server DDK with ml64 and cl.exe for AMD64 from
15; http://www.microsoft.com/whdc/devtools/ddk/default.mspx for low price)
16;
17
18.code
19inffas8664fnc PROC
20
21; see http://weblogs.asp.net/oldnewthing/archive/2004/01/14/58579.aspx and
22; http://msdn.microsoft.com/library/en-us/kmarch/hh/kmarch/64bitAMD_8e951dd2-ee77-4728-8702-55ce4b5dd24a.xml.asp
23;
24; All registers must be preserved across the call, except for
25; rax, rcx, rdx, r8, r-9, r10, and r11, which are scratch.
26
27
28 mov [rsp-8],rsi
29 mov [rsp-16],rdi
30 mov [rsp-24],r12
31 mov [rsp-32],r13
32 mov [rsp-40],r14
33 mov [rsp-48],r15
34 mov [rsp-56],rbx
35
36 mov rax,rcx
37
38 mov [rax+8], rbp ; /* save regs rbp and rsp */
39 mov [rax], rsp
40
41 mov rsp, rax ; /* make rsp point to &ar */
42
43 mov rsi, [rsp+16] ; /* rsi = in */
44 mov rdi, [rsp+32] ; /* rdi = out */
45 mov r9, [rsp+24] ; /* r9 = last */
46 mov r10, [rsp+48] ; /* r10 = end */
47 mov rbp, [rsp+64] ; /* rbp = lcode */
48 mov r11, [rsp+72] ; /* r11 = dcode */
49 mov rdx, [rsp+80] ; /* rdx = hold */
50 mov ebx, [rsp+88] ; /* ebx = bits */
51 mov r12d, [rsp+100] ; /* r12d = lmask */
52 mov r13d, [rsp+104] ; /* r13d = dmask */
53 ; /* r14d = len */
54 ; /* r15d = dist */
55
56
57 cld
58 cmp r10, rdi
59 je L_one_time ; /* if only one decode left */
60 cmp r9, rsi
61
62 jne L_do_loop
63
64
65L_one_time:
66 mov r8, r12 ; /* r8 = lmask */
67 cmp bl, 32
68 ja L_get_length_code_one_time
69
70 lodsd ; /* eax = *(uint *)in++ */
71 mov cl, bl ; /* cl = bits, needs it for shifting */
72 add bl, 32 ; /* bits += 32 */
73 shl rax, cl
74 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
75 jmp L_get_length_code_one_time
76
77ALIGN 4
78L_while_test:
79 cmp r10, rdi
80 jbe L_break_loop
81 cmp r9, rsi
82 jbe L_break_loop
83
84L_do_loop:
85 mov r8, r12 ; /* r8 = lmask */
86 cmp bl, 32
87 ja L_get_length_code ; /* if (32 < bits) */
88
89 lodsd ; /* eax = *(uint *)in++ */
90 mov cl, bl ; /* cl = bits, needs it for shifting */
91 add bl, 32 ; /* bits += 32 */
92 shl rax, cl
93 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
94
95L_get_length_code:
96 and r8, rdx ; /* r8 &= hold */
97 mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
98
99 mov cl, ah ; /* cl = this.bits */
100 sub bl, ah ; /* bits -= this.bits */
101 shr rdx, cl ; /* hold >>= this.bits */
102
103 test al, al
104 jnz L_test_for_length_base ; /* if (op != 0) 45.7% */
105
106 mov r8, r12 ; /* r8 = lmask */
107 shr eax, 16 ; /* output this.val char */
108 stosb
109
110L_get_length_code_one_time:
111 and r8, rdx ; /* r8 &= hold */
112 mov eax, [rbp+r8*4] ; /* eax = lcode[hold & lmask] */
113
114L_dolen:
115 mov cl, ah ; /* cl = this.bits */
116 sub bl, ah ; /* bits -= this.bits */
117 shr rdx, cl ; /* hold >>= this.bits */
118
119 test al, al
120 jnz L_test_for_length_base ; /* if (op != 0) 45.7% */
121
122 shr eax, 16 ; /* output this.val char */
123 stosb
124 jmp L_while_test
125
126ALIGN 4
127L_test_for_length_base:
128 mov r14d, eax ; /* len = this */
129 shr r14d, 16 ; /* len = this.val */
130 mov cl, al
131
132 test al, 16
133 jz L_test_for_second_level_length ; /* if ((op & 16) == 0) 8% */
134 and cl, 15 ; /* op &= 15 */
135 jz L_decode_distance ; /* if (!op) */
136
137L_add_bits_to_len:
138 sub bl, cl
139 xor eax, eax
140 inc eax
141 shl eax, cl
142 dec eax
143 and eax, edx ; /* eax &= hold */
144 shr rdx, cl
145 add r14d, eax ; /* len += hold & mask[op] */
146
147L_decode_distance:
148 mov r8, r13 ; /* r8 = dmask */
149 cmp bl, 32
150 ja L_get_distance_code ; /* if (32 < bits) */
151
152 lodsd ; /* eax = *(uint *)in++ */
153 mov cl, bl ; /* cl = bits, needs it for shifting */
154 add bl, 32 ; /* bits += 32 */
155 shl rax, cl
156 or rdx, rax ; /* hold |= *((uint *)in)++ << bits */
157
158L_get_distance_code:
159 and r8, rdx ; /* r8 &= hold */
160 mov eax, [r11+r8*4] ; /* eax = dcode[hold & dmask] */
161
162L_dodist:
163 mov r15d, eax ; /* dist = this */
164 shr r15d, 16 ; /* dist = this.val */
165 mov cl, ah
166 sub bl, ah ; /* bits -= this.bits */
167 shr rdx, cl ; /* hold >>= this.bits */
168 mov cl, al ; /* cl = this.op */
169
170 test al, 16 ; /* if ((op & 16) == 0) */
171 jz L_test_for_second_level_dist
172 and cl, 15 ; /* op &= 15 */
173 jz L_check_dist_one
174
175L_add_bits_to_dist:
176 sub bl, cl
177 xor eax, eax
178 inc eax
179 shl eax, cl
180 dec eax ; /* (1 << op) - 1 */
181 and eax, edx ; /* eax &= hold */
182 shr rdx, cl
183 add r15d, eax ; /* dist += hold & ((1 << op) - 1) */
184
185L_check_window:
186 mov r8, rsi ; /* save in so from can use it's reg */
187 mov rax, rdi
188 sub rax, [rsp+40] ; /* nbytes = out - beg */
189
190 cmp eax, r15d
191 jb L_clip_window ; /* if (dist > nbytes) 4.2% */
192
193 mov ecx, r14d ; /* ecx = len */
194 mov rsi, rdi
195 sub rsi, r15 ; /* from = out - dist */
196
197 sar ecx, 1
198 jnc L_copy_two ; /* if len % 2 == 0 */
199
200 rep movsw
201 mov al, [rsi]
202 mov [rdi], al
203 inc rdi
204
205 mov rsi, r8 ; /* move in back to %rsi, toss from */
206 jmp L_while_test
207
208L_copy_two:
209 rep movsw
210 mov rsi, r8 ; /* move in back to %rsi, toss from */
211 jmp L_while_test
212
213ALIGN 4
214L_check_dist_one:
215 cmp r15d, 1 ; /* if dist 1, is a memset */
216 jne L_check_window
217 cmp [rsp+40], rdi ; /* if out == beg, outside window */
218 je L_check_window
219
220 mov ecx, r14d ; /* ecx = len */
221 mov al, [rdi-1]
222 mov ah, al
223
224 sar ecx, 1
225 jnc L_set_two
226 mov [rdi], al
227 inc rdi
228
229L_set_two:
230 rep stosw
231 jmp L_while_test
232
233ALIGN 4
234L_test_for_second_level_length:
235 test al, 64
236 jnz L_test_for_end_of_block ; /* if ((op & 64) != 0) */
237
238 xor eax, eax
239 inc eax
240 shl eax, cl
241 dec eax
242 and eax, edx ; /* eax &= hold */
243 add eax, r14d ; /* eax += len */
244 mov eax, [rbp+rax*4] ; /* eax = lcode[val+(hold&mask[op])]*/
245 jmp L_dolen
246
247ALIGN 4
248L_test_for_second_level_dist:
249 test al, 64
250 jnz L_invalid_distance_code ; /* if ((op & 64) != 0) */
251
252 xor eax, eax
253 inc eax
254 shl eax, cl
255 dec eax
256 and eax, edx ; /* eax &= hold */
257 add eax, r15d ; /* eax += dist */
258 mov eax, [r11+rax*4] ; /* eax = dcode[val+(hold&mask[op])]*/
259 jmp L_dodist
260
261ALIGN 4
262L_clip_window:
263 mov ecx, eax ; /* ecx = nbytes */
264 mov eax, [rsp+92] ; /* eax = wsize, prepare for dist cmp */
265 neg ecx ; /* nbytes = -nbytes */
266
267 cmp eax, r15d
268 jb L_invalid_distance_too_far ; /* if (dist > wsize) */
269
270 add ecx, r15d ; /* nbytes = dist - nbytes */
271 cmp dword ptr [rsp+96], 0
272 jne L_wrap_around_window ; /* if (write != 0) */
273
274 mov rsi, [rsp+56] ; /* from = window */
275 sub eax, ecx ; /* eax -= nbytes */
276 add rsi, rax ; /* from += wsize - nbytes */
277
278 mov eax, r14d ; /* eax = len */
279 cmp r14d, ecx
280 jbe L_do_copy ; /* if (nbytes >= len) */
281
282 sub eax, ecx ; /* eax -= nbytes */
283 rep movsb
284 mov rsi, rdi
285 sub rsi, r15 ; /* from = &out[ -dist ] */
286 jmp L_do_copy
287
288ALIGN 4
289L_wrap_around_window:
290 mov eax, [rsp+96] ; /* eax = write */
291 cmp ecx, eax
292 jbe L_contiguous_in_window ; /* if (write >= nbytes) */
293
294 mov esi, [rsp+92] ; /* from = wsize */
295 add rsi, [rsp+56] ; /* from += window */
296 add rsi, rax ; /* from += write */
297 sub rsi, rcx ; /* from -= nbytes */
298 sub ecx, eax ; /* nbytes -= write */
299
300 mov eax, r14d ; /* eax = len */
301 cmp eax, ecx
302 jbe L_do_copy ; /* if (nbytes >= len) */
303
304 sub eax, ecx ; /* len -= nbytes */
305 rep movsb
306 mov rsi, [rsp+56] ; /* from = window */
307 mov ecx, [rsp+96] ; /* nbytes = write */
308 cmp eax, ecx
309 jbe L_do_copy ; /* if (nbytes >= len) */
310
311 sub eax, ecx ; /* len -= nbytes */
312 rep movsb
313 mov rsi, rdi
314 sub rsi, r15 ; /* from = out - dist */
315 jmp L_do_copy
316
317ALIGN 4
318L_contiguous_in_window:
319 mov rsi, [rsp+56] ; /* rsi = window */
320 add rsi, rax
321 sub rsi, rcx ; /* from += write - nbytes */
322
323 mov eax, r14d ; /* eax = len */
324 cmp eax, ecx
325 jbe L_do_copy ; /* if (nbytes >= len) */
326
327 sub eax, ecx ; /* len -= nbytes */
328 rep movsb
329 mov rsi, rdi
330 sub rsi, r15 ; /* from = out - dist */
331 jmp L_do_copy ; /* if (nbytes >= len) */
332
333ALIGN 4
334L_do_copy:
335 mov ecx, eax ; /* ecx = len */
336 rep movsb
337
338 mov rsi, r8 ; /* move in back to %esi, toss from */
339 jmp L_while_test
340
341L_test_for_end_of_block:
342 test al, 32
343 jz L_invalid_literal_length_code
344 mov dword ptr [rsp+116], 1
345 jmp L_break_loop_with_status
346
347L_invalid_literal_length_code:
348 mov dword ptr [rsp+116], 2
349 jmp L_break_loop_with_status
350
351L_invalid_distance_code:
352 mov dword ptr [rsp+116], 3
353 jmp L_break_loop_with_status
354
355L_invalid_distance_too_far:
356 mov dword ptr [rsp+116], 4
357 jmp L_break_loop_with_status
358
359L_break_loop:
360 mov dword ptr [rsp+116], 0
361
362L_break_loop_with_status:
363; /* put in, out, bits, and hold back into ar and pop esp */
364 mov [rsp+16], rsi ; /* in */
365 mov [rsp+32], rdi ; /* out */
366 mov [rsp+88], ebx ; /* bits */
367 mov [rsp+80], rdx ; /* hold */
368
369 mov rax, [rsp] ; /* restore rbp and rsp */
370 mov rbp, [rsp+8]
371 mov rsp, rax
372
373
374
375 mov rsi,[rsp-8]
376 mov rdi,[rsp-16]
377 mov r12,[rsp-24]
378 mov r13,[rsp-32]
379 mov r14,[rsp-40]
380 mov r15,[rsp-48]
381 mov rbx,[rsp-56]
382
383 ret 0
384; :
385; : "m" (ar)
386; : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
387; "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
388; );
389
390inffas8664fnc ENDP
391;_TEXT ENDS
392END
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