1#! /usr/bin/env perl
2# Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3#
4# Licensed under the OpenSSL license (the "License").  You may not use
5# this file except in compliance with the License.  You can obtain a copy
6# in the file LICENSE in the source distribution or at
7# https://www.openssl.org/source/license.html
8
9
10$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
11push(@INC,"${dir}","${dir}../../perlasm");
12require "x86asm.pl";
13
14$output = pop;
15open STDOUT,">$output";
16
17&asm_init($ARGV[0]);
18
19$sse2=0;
20for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
21
22&external_label("OPENSSL_ia32cap_P") if ($sse2);
23
24&bn_mul_add_words("bn_mul_add_words");
25&bn_mul_words("bn_mul_words");
26&bn_sqr_words("bn_sqr_words");
27&bn_div_words("bn_div_words");
28&bn_add_words("bn_add_words");
29&bn_sub_words("bn_sub_words");
30&bn_sub_part_words("bn_sub_part_words");
31
32&asm_finish();
33
34close STDOUT or die "error closing STDOUT: $!";
35
36sub bn_mul_add_words
37	{
38	local($name)=@_;
39
40	&function_begin_B($name,$sse2?"EXTRN\t_OPENSSL_ia32cap_P:DWORD":"");
41
42	$r="eax";
43	$a="edx";
44	$c="ecx";
45
46	if ($sse2) {
47		&picmeup("eax","OPENSSL_ia32cap_P");
48		&bt(&DWP(0,"eax"),26);
49		&jnc(&label("maw_non_sse2"));
50
51		&mov($r,&wparam(0));
52		&mov($a,&wparam(1));
53		&mov($c,&wparam(2));
54		&movd("mm0",&wparam(3));	# mm0 = w
55		&pxor("mm1","mm1");		# mm1 = carry_in
56		&jmp(&label("maw_sse2_entry"));
57
58	&set_label("maw_sse2_unrolled",16);
59		&movd("mm3",&DWP(0,$r,"",0));	# mm3 = r[0]
60		&paddq("mm1","mm3");		# mm1 = carry_in + r[0]
61		&movd("mm2",&DWP(0,$a,"",0));	# mm2 = a[0]
62		&pmuludq("mm2","mm0");		# mm2 = w*a[0]
63		&movd("mm4",&DWP(4,$a,"",0));	# mm4 = a[1]
64		&pmuludq("mm4","mm0");		# mm4 = w*a[1]
65		&movd("mm6",&DWP(8,$a,"",0));	# mm6 = a[2]
66		&pmuludq("mm6","mm0");		# mm6 = w*a[2]
67		&movd("mm7",&DWP(12,$a,"",0));	# mm7 = a[3]
68		&pmuludq("mm7","mm0");		# mm7 = w*a[3]
69		&paddq("mm1","mm2");		# mm1 = carry_in + r[0] + w*a[0]
70		&movd("mm3",&DWP(4,$r,"",0));	# mm3 = r[1]
71		&paddq("mm3","mm4");		# mm3 = r[1] + w*a[1]
72		&movd("mm5",&DWP(8,$r,"",0));	# mm5 = r[2]
73		&paddq("mm5","mm6");		# mm5 = r[2] + w*a[2]
74		&movd("mm4",&DWP(12,$r,"",0));	# mm4 = r[3]
75		&paddq("mm7","mm4");		# mm7 = r[3] + w*a[3]
76		&movd(&DWP(0,$r,"",0),"mm1");
77		&movd("mm2",&DWP(16,$a,"",0));	# mm2 = a[4]
78		&pmuludq("mm2","mm0");		# mm2 = w*a[4]
79		&psrlq("mm1",32);		# mm1 = carry0
80		&movd("mm4",&DWP(20,$a,"",0));	# mm4 = a[5]
81		&pmuludq("mm4","mm0");		# mm4 = w*a[5]
82		&paddq("mm1","mm3");		# mm1 = carry0 + r[1] + w*a[1]
83		&movd("mm6",&DWP(24,$a,"",0));	# mm6 = a[6]
84		&pmuludq("mm6","mm0");		# mm6 = w*a[6]
85		&movd(&DWP(4,$r,"",0),"mm1");
86		&psrlq("mm1",32);		# mm1 = carry1
87		&movd("mm3",&DWP(28,$a,"",0));	# mm3 = a[7]
88		&add($a,32);
89		&pmuludq("mm3","mm0");		# mm3 = w*a[7]
90		&paddq("mm1","mm5");		# mm1 = carry1 + r[2] + w*a[2]
91		&movd("mm5",&DWP(16,$r,"",0));	# mm5 = r[4]
92		&paddq("mm2","mm5");		# mm2 = r[4] + w*a[4]
93		&movd(&DWP(8,$r,"",0),"mm1");
94		&psrlq("mm1",32);		# mm1 = carry2
95		&paddq("mm1","mm7");		# mm1 = carry2 + r[3] + w*a[3]
96		&movd("mm5",&DWP(20,$r,"",0));	# mm5 = r[5]
97		&paddq("mm4","mm5");		# mm4 = r[5] + w*a[5]
98		&movd(&DWP(12,$r,"",0),"mm1");
99		&psrlq("mm1",32);		# mm1 = carry3
100		&paddq("mm1","mm2");		# mm1 = carry3 + r[4] + w*a[4]
101		&movd("mm5",&DWP(24,$r,"",0));	# mm5 = r[6]
102		&paddq("mm6","mm5");		# mm6 = r[6] + w*a[6]
103		&movd(&DWP(16,$r,"",0),"mm1");
104		&psrlq("mm1",32);		# mm1 = carry4
105		&paddq("mm1","mm4");		# mm1 = carry4 + r[5] + w*a[5]
106		&movd("mm5",&DWP(28,$r,"",0));	# mm5 = r[7]
107		&paddq("mm3","mm5");		# mm3 = r[7] + w*a[7]
108		&movd(&DWP(20,$r,"",0),"mm1");
109		&psrlq("mm1",32);		# mm1 = carry5
110		&paddq("mm1","mm6");		# mm1 = carry5 + r[6] + w*a[6]
111		&movd(&DWP(24,$r,"",0),"mm1");
112		&psrlq("mm1",32);		# mm1 = carry6
113		&paddq("mm1","mm3");		# mm1 = carry6 + r[7] + w*a[7]
114		&movd(&DWP(28,$r,"",0),"mm1");
115		&lea($r,&DWP(32,$r));
116		&psrlq("mm1",32);		# mm1 = carry_out
117
118		&sub($c,8);
119		&jz(&label("maw_sse2_exit"));
120	&set_label("maw_sse2_entry");
121		&test($c,0xfffffff8);
122		&jnz(&label("maw_sse2_unrolled"));
123
124	&set_label("maw_sse2_loop",4);
125		&movd("mm2",&DWP(0,$a));	# mm2 = a[i]
126		&movd("mm3",&DWP(0,$r));	# mm3 = r[i]
127		&pmuludq("mm2","mm0");		# a[i] *= w
128		&lea($a,&DWP(4,$a));
129		&paddq("mm1","mm3");		# carry += r[i]
130		&paddq("mm1","mm2");		# carry += a[i]*w
131		&movd(&DWP(0,$r),"mm1");	# r[i] = carry_low
132		&sub($c,1);
133		&psrlq("mm1",32);		# carry = carry_high
134		&lea($r,&DWP(4,$r));
135		&jnz(&label("maw_sse2_loop"));
136	&set_label("maw_sse2_exit");
137		&movd("eax","mm1");		# c = carry_out
138		&emms();
139		&ret();
140
141	&set_label("maw_non_sse2",16);
142	}
143
144	# function_begin prologue
145	&push("ebp");
146	&push("ebx");
147	&push("esi");
148	&push("edi");
149
150	&comment("");
151	$Low="eax";
152	$High="edx";
153	$a="ebx";
154	$w="ebp";
155	$r="edi";
156	$c="esi";
157
158	&xor($c,$c);		# clear carry
159	&mov($r,&wparam(0));	#
160
161	&mov("ecx",&wparam(2));	#
162	&mov($a,&wparam(1));	#
163
164	&and("ecx",0xfffffff8);	# num / 8
165	&mov($w,&wparam(3));	#
166
167	&push("ecx");		# Up the stack for a tmp variable
168
169	&jz(&label("maw_finish"));
170
171	&set_label("maw_loop",16);
172
173	for ($i=0; $i<32; $i+=4)
174		{
175		&comment("Round $i");
176
177		 &mov("eax",&DWP($i,$a)); 	# *a
178		&mul($w);			# *a * w
179		&add("eax",$c);			# L(t)+= c
180		&adc("edx",0);			# H(t)+=carry
181		 &add("eax",&DWP($i,$r));	# L(t)+= *r
182		&adc("edx",0);			# H(t)+=carry
183		 &mov(&DWP($i,$r),"eax");	# *r= L(t);
184		&mov($c,"edx");			# c=  H(t);
185		}
186
187	&comment("");
188	&sub("ecx",8);
189	&lea($a,&DWP(32,$a));
190	&lea($r,&DWP(32,$r));
191	&jnz(&label("maw_loop"));
192
193	&set_label("maw_finish",0);
194	&mov("ecx",&wparam(2));	# get num
195	&and("ecx",7);
196	&jnz(&label("maw_finish2"));	# helps branch prediction
197	&jmp(&label("maw_end"));
198
199	&set_label("maw_finish2",1);
200	for ($i=0; $i<7; $i++)
201		{
202		&comment("Tail Round $i");
203		 &mov("eax",&DWP($i*4,$a));	# *a
204		&mul($w);			# *a * w
205		&add("eax",$c);			# L(t)+=c
206		&adc("edx",0);			# H(t)+=carry
207		 &add("eax",&DWP($i*4,$r));	# L(t)+= *r
208		&adc("edx",0);			# H(t)+=carry
209		 &dec("ecx") if ($i != 7-1);
210		&mov(&DWP($i*4,$r),"eax");	# *r= L(t);
211		 &mov($c,"edx");		# c=  H(t);
212		&jz(&label("maw_end")) if ($i != 7-1);
213		}
214	&set_label("maw_end",0);
215	&mov("eax",$c);
216
217	&pop("ecx");	# clear variable from
218
219	&function_end($name);
220	}
221
222sub bn_mul_words
223	{
224	local($name)=@_;
225
226	&function_begin_B($name,$sse2?"EXTRN\t_OPENSSL_ia32cap_P:DWORD":"");
227
228	$r="eax";
229	$a="edx";
230	$c="ecx";
231
232	if ($sse2) {
233		&picmeup("eax","OPENSSL_ia32cap_P");
234		&bt(&DWP(0,"eax"),26);
235		&jnc(&label("mw_non_sse2"));
236
237		&mov($r,&wparam(0));
238		&mov($a,&wparam(1));
239		&mov($c,&wparam(2));
240		&movd("mm0",&wparam(3));	# mm0 = w
241		&pxor("mm1","mm1");		# mm1 = carry = 0
242
243	&set_label("mw_sse2_loop",16);
244		&movd("mm2",&DWP(0,$a));	# mm2 = a[i]
245		&pmuludq("mm2","mm0");		# a[i] *= w
246		&lea($a,&DWP(4,$a));
247		&paddq("mm1","mm2");		# carry += a[i]*w
248		&movd(&DWP(0,$r),"mm1");	# r[i] = carry_low
249		&sub($c,1);
250		&psrlq("mm1",32);		# carry = carry_high
251		&lea($r,&DWP(4,$r));
252		&jnz(&label("mw_sse2_loop"));
253
254		&movd("eax","mm1");		# return carry
255		&emms();
256		&ret();
257	&set_label("mw_non_sse2",16);
258	}
259
260	# function_begin prologue
261	&push("ebp");
262	&push("ebx");
263	&push("esi");
264	&push("edi");
265
266	&comment("");
267	$Low="eax";
268	$High="edx";
269	$a="ebx";
270	$w="ecx";
271	$r="edi";
272	$c="esi";
273	$num="ebp";
274
275	&xor($c,$c);		# clear carry
276	&mov($r,&wparam(0));	#
277	&mov($a,&wparam(1));	#
278	&mov($num,&wparam(2));	#
279	&mov($w,&wparam(3));	#
280
281	&and($num,0xfffffff8);	# num / 8
282	&jz(&label("mw_finish"));
283
284	&set_label("mw_loop",0);
285	for ($i=0; $i<32; $i+=4)
286		{
287		&comment("Round $i");
288
289		 &mov("eax",&DWP($i,$a,"",0)); 	# *a
290		&mul($w);			# *a * w
291		&add("eax",$c);			# L(t)+=c
292		 # XXX
293
294		&adc("edx",0);			# H(t)+=carry
295		 &mov(&DWP($i,$r,"",0),"eax");	# *r= L(t);
296
297		&mov($c,"edx");			# c=  H(t);
298		}
299
300	&comment("");
301	&add($a,32);
302	&add($r,32);
303	&sub($num,8);
304	&jz(&label("mw_finish"));
305	&jmp(&label("mw_loop"));
306
307	&set_label("mw_finish",0);
308	&mov($num,&wparam(2));	# get num
309	&and($num,7);
310	&jnz(&label("mw_finish2"));
311	&jmp(&label("mw_end"));
312
313	&set_label("mw_finish2",1);
314	for ($i=0; $i<7; $i++)
315		{
316		&comment("Tail Round $i");
317		 &mov("eax",&DWP($i*4,$a,"",0));# *a
318		&mul($w);			# *a * w
319		&add("eax",$c);			# L(t)+=c
320		 # XXX
321		&adc("edx",0);			# H(t)+=carry
322		 &mov(&DWP($i*4,$r,"",0),"eax");# *r= L(t);
323		&mov($c,"edx");			# c=  H(t);
324		 &dec($num) if ($i != 7-1);
325		&jz(&label("mw_end")) if ($i != 7-1);
326		}
327	&set_label("mw_end",0);
328	&mov("eax",$c);
329
330	&function_end($name);
331	}
332
333sub bn_sqr_words
334	{
335	local($name)=@_;
336
337	&function_begin_B($name,$sse2?"EXTRN\t_OPENSSL_ia32cap_P:DWORD":"");
338
339	$r="eax";
340	$a="edx";
341	$c="ecx";
342
343	if ($sse2) {
344		&picmeup("eax","OPENSSL_ia32cap_P");
345		&bt(&DWP(0,"eax"),26);
346		&jnc(&label("sqr_non_sse2"));
347
348		&mov($r,&wparam(0));
349		&mov($a,&wparam(1));
350		&mov($c,&wparam(2));
351
352	&set_label("sqr_sse2_loop",16);
353		&movd("mm0",&DWP(0,$a));	# mm0 = a[i]
354		&pmuludq("mm0","mm0");		# a[i] *= a[i]
355		&lea($a,&DWP(4,$a));		# a++
356		&movq(&QWP(0,$r),"mm0");	# r[i] = a[i]*a[i]
357		&sub($c,1);
358		&lea($r,&DWP(8,$r));		# r += 2
359		&jnz(&label("sqr_sse2_loop"));
360
361		&emms();
362		&ret();
363	&set_label("sqr_non_sse2",16);
364	}
365
366	# function_begin prologue
367	&push("ebp");
368	&push("ebx");
369	&push("esi");
370	&push("edi");
371
372	&comment("");
373	$r="esi";
374	$a="edi";
375	$num="ebx";
376
377	&mov($r,&wparam(0));	#
378	&mov($a,&wparam(1));	#
379	&mov($num,&wparam(2));	#
380
381	&and($num,0xfffffff8);	# num / 8
382	&jz(&label("sw_finish"));
383
384	&set_label("sw_loop",0);
385	for ($i=0; $i<32; $i+=4)
386		{
387		&comment("Round $i");
388		&mov("eax",&DWP($i,$a,"",0)); 	# *a
389		 # XXX
390		&mul("eax");			# *a * *a
391		&mov(&DWP($i*2,$r,"",0),"eax");	#
392		 &mov(&DWP($i*2+4,$r,"",0),"edx");#
393		}
394
395	&comment("");
396	&add($a,32);
397	&add($r,64);
398	&sub($num,8);
399	&jnz(&label("sw_loop"));
400
401	&set_label("sw_finish",0);
402	&mov($num,&wparam(2));	# get num
403	&and($num,7);
404	&jz(&label("sw_end"));
405
406	for ($i=0; $i<7; $i++)
407		{
408		&comment("Tail Round $i");
409		&mov("eax",&DWP($i*4,$a,"",0));	# *a
410		 # XXX
411		&mul("eax");			# *a * *a
412		&mov(&DWP($i*8,$r,"",0),"eax");	#
413		 &dec($num) if ($i != 7-1);
414		&mov(&DWP($i*8+4,$r,"",0),"edx");
415		 &jz(&label("sw_end")) if ($i != 7-1);
416		}
417	&set_label("sw_end",0);
418
419	&function_end($name);
420	}
421
422sub bn_div_words
423	{
424	local($name)=@_;
425
426	&function_begin_B($name,"");
427	&mov("edx",&wparam(0));	#
428	&mov("eax",&wparam(1));	#
429	&mov("ecx",&wparam(2));	#
430	&div("ecx");
431	&ret();
432	&function_end_B($name);
433	}
434
435sub bn_add_words
436	{
437	local($name)=@_;
438
439	&function_begin($name,"");
440
441	&comment("");
442	$a="esi";
443	$b="edi";
444	$c="eax";
445	$r="ebx";
446	$tmp1="ecx";
447	$tmp2="edx";
448	$num="ebp";
449
450	&mov($r,&wparam(0));	# get r
451	 &mov($a,&wparam(1));	# get a
452	&mov($b,&wparam(2));	# get b
453	 &mov($num,&wparam(3));	# get num
454	&xor($c,$c);		# clear carry
455	 &and($num,0xfffffff8);	# num / 8
456
457	&jz(&label("aw_finish"));
458
459	&set_label("aw_loop",0);
460	for ($i=0; $i<8; $i++)
461		{
462		&comment("Round $i");
463
464		&mov($tmp1,&DWP($i*4,$a,"",0)); 	# *a
465		 &mov($tmp2,&DWP($i*4,$b,"",0)); 	# *b
466		&add($tmp1,$c);
467		 &mov($c,0);
468		&adc($c,$c);
469		 &add($tmp1,$tmp2);
470		&adc($c,0);
471		 &mov(&DWP($i*4,$r,"",0),$tmp1); 	# *r
472		}
473
474	&comment("");
475	&add($a,32);
476	 &add($b,32);
477	&add($r,32);
478	 &sub($num,8);
479	&jnz(&label("aw_loop"));
480
481	&set_label("aw_finish",0);
482	&mov($num,&wparam(3));	# get num
483	&and($num,7);
484	 &jz(&label("aw_end"));
485
486	for ($i=0; $i<7; $i++)
487		{
488		&comment("Tail Round $i");
489		&mov($tmp1,&DWP($i*4,$a,"",0));	# *a
490		 &mov($tmp2,&DWP($i*4,$b,"",0));# *b
491		&add($tmp1,$c);
492		 &mov($c,0);
493		&adc($c,$c);
494		 &add($tmp1,$tmp2);
495		&adc($c,0);
496		 &dec($num) if ($i != 6);
497		&mov(&DWP($i*4,$r,"",0),$tmp1);	# *r
498		 &jz(&label("aw_end")) if ($i != 6);
499		}
500	&set_label("aw_end",0);
501
502#	&mov("eax",$c);		# $c is "eax"
503
504	&function_end($name);
505	}
506
507sub bn_sub_words
508	{
509	local($name)=@_;
510
511	&function_begin($name,"");
512
513	&comment("");
514	$a="esi";
515	$b="edi";
516	$c="eax";
517	$r="ebx";
518	$tmp1="ecx";
519	$tmp2="edx";
520	$num="ebp";
521
522	&mov($r,&wparam(0));	# get r
523	 &mov($a,&wparam(1));	# get a
524	&mov($b,&wparam(2));	# get b
525	 &mov($num,&wparam(3));	# get num
526	&xor($c,$c);		# clear carry
527	 &and($num,0xfffffff8);	# num / 8
528
529	&jz(&label("aw_finish"));
530
531	&set_label("aw_loop",0);
532	for ($i=0; $i<8; $i++)
533		{
534		&comment("Round $i");
535
536		&mov($tmp1,&DWP($i*4,$a,"",0)); 	# *a
537		 &mov($tmp2,&DWP($i*4,$b,"",0)); 	# *b
538		&sub($tmp1,$c);
539		 &mov($c,0);
540		&adc($c,$c);
541		 &sub($tmp1,$tmp2);
542		&adc($c,0);
543		 &mov(&DWP($i*4,$r,"",0),$tmp1); 	# *r
544		}
545
546	&comment("");
547	&add($a,32);
548	 &add($b,32);
549	&add($r,32);
550	 &sub($num,8);
551	&jnz(&label("aw_loop"));
552
553	&set_label("aw_finish",0);
554	&mov($num,&wparam(3));	# get num
555	&and($num,7);
556	 &jz(&label("aw_end"));
557
558	for ($i=0; $i<7; $i++)
559		{
560		&comment("Tail Round $i");
561		&mov($tmp1,&DWP($i*4,$a,"",0));	# *a
562		 &mov($tmp2,&DWP($i*4,$b,"",0));# *b
563		&sub($tmp1,$c);
564		 &mov($c,0);
565		&adc($c,$c);
566		 &sub($tmp1,$tmp2);
567		&adc($c,0);
568		 &dec($num) if ($i != 6);
569		&mov(&DWP($i*4,$r,"",0),$tmp1);	# *r
570		 &jz(&label("aw_end")) if ($i != 6);
571		}
572	&set_label("aw_end",0);
573
574#	&mov("eax",$c);		# $c is "eax"
575
576	&function_end($name);
577	}
578
579sub bn_sub_part_words
580	{
581	local($name)=@_;
582
583	&function_begin($name,"");
584
585	&comment("");
586	$a="esi";
587	$b="edi";
588	$c="eax";
589	$r="ebx";
590	$tmp1="ecx";
591	$tmp2="edx";
592	$num="ebp";
593
594	&mov($r,&wparam(0));	# get r
595	 &mov($a,&wparam(1));	# get a
596	&mov($b,&wparam(2));	# get b
597	 &mov($num,&wparam(3));	# get num
598	&xor($c,$c);		# clear carry
599	 &and($num,0xfffffff8);	# num / 8
600
601	&jz(&label("aw_finish"));
602
603	&set_label("aw_loop",0);
604	for ($i=0; $i<8; $i++)
605		{
606		&comment("Round $i");
607
608		&mov($tmp1,&DWP($i*4,$a,"",0)); 	# *a
609		 &mov($tmp2,&DWP($i*4,$b,"",0)); 	# *b
610		&sub($tmp1,$c);
611		 &mov($c,0);
612		&adc($c,$c);
613		 &sub($tmp1,$tmp2);
614		&adc($c,0);
615		 &mov(&DWP($i*4,$r,"",0),$tmp1); 	# *r
616		}
617
618	&comment("");
619	&add($a,32);
620	 &add($b,32);
621	&add($r,32);
622	 &sub($num,8);
623	&jnz(&label("aw_loop"));
624
625	&set_label("aw_finish",0);
626	&mov($num,&wparam(3));	# get num
627	&and($num,7);
628	 &jz(&label("aw_end"));
629
630	for ($i=0; $i<7; $i++)
631		{
632		&comment("Tail Round $i");
633		&mov($tmp1,&DWP(0,$a,"",0));	# *a
634		 &mov($tmp2,&DWP(0,$b,"",0));# *b
635		&sub($tmp1,$c);
636		 &mov($c,0);
637		&adc($c,$c);
638		 &sub($tmp1,$tmp2);
639		&adc($c,0);
640		&mov(&DWP(0,$r,"",0),$tmp1);	# *r
641		&add($a, 4);
642		&add($b, 4);
643		&add($r, 4);
644		 &dec($num) if ($i != 6);
645		 &jz(&label("aw_end")) if ($i != 6);
646		}
647	&set_label("aw_end",0);
648
649	&cmp(&wparam(4),0);
650	&je(&label("pw_end"));
651
652	&mov($num,&wparam(4));	# get dl
653	&cmp($num,0);
654	&je(&label("pw_end"));
655	&jge(&label("pw_pos"));
656
657	&comment("pw_neg");
658	&mov($tmp2,0);
659	&sub($tmp2,$num);
660	&mov($num,$tmp2);
661	&and($num,0xfffffff8);	# num / 8
662	&jz(&label("pw_neg_finish"));
663
664	&set_label("pw_neg_loop",0);
665	for ($i=0; $i<8; $i++)
666	{
667	    &comment("dl<0 Round $i");
668
669	    &mov($tmp1,0);
670	    &mov($tmp2,&DWP($i*4,$b,"",0)); 	# *b
671	    &sub($tmp1,$c);
672	    &mov($c,0);
673	    &adc($c,$c);
674	    &sub($tmp1,$tmp2);
675	    &adc($c,0);
676	    &mov(&DWP($i*4,$r,"",0),$tmp1); 	# *r
677	}
678
679	&comment("");
680	&add($b,32);
681	&add($r,32);
682	&sub($num,8);
683	&jnz(&label("pw_neg_loop"));
684
685	&set_label("pw_neg_finish",0);
686	&mov($tmp2,&wparam(4));	# get dl
687	&mov($num,0);
688	&sub($num,$tmp2);
689	&and($num,7);
690	&jz(&label("pw_end"));
691
692	for ($i=0; $i<7; $i++)
693	{
694	    &comment("dl<0 Tail Round $i");
695	    &mov($tmp1,0);
696	    &mov($tmp2,&DWP($i*4,$b,"",0));# *b
697	    &sub($tmp1,$c);
698	    &mov($c,0);
699	    &adc($c,$c);
700	    &sub($tmp1,$tmp2);
701	    &adc($c,0);
702	    &dec($num) if ($i != 6);
703	    &mov(&DWP($i*4,$r,"",0),$tmp1);	# *r
704	    &jz(&label("pw_end")) if ($i != 6);
705	}
706
707	&jmp(&label("pw_end"));
708
709	&set_label("pw_pos",0);
710
711	&and($num,0xfffffff8);	# num / 8
712	&jz(&label("pw_pos_finish"));
713
714	&set_label("pw_pos_loop",0);
715
716	for ($i=0; $i<8; $i++)
717	{
718	    &comment("dl>0 Round $i");
719
720	    &mov($tmp1,&DWP($i*4,$a,"",0));	# *a
721	    &sub($tmp1,$c);
722	    &mov(&DWP($i*4,$r,"",0),$tmp1);	# *r
723	    &jnc(&label("pw_nc".$i));
724	}
725
726	&comment("");
727	&add($a,32);
728	&add($r,32);
729	&sub($num,8);
730	&jnz(&label("pw_pos_loop"));
731
732	&set_label("pw_pos_finish",0);
733	&mov($num,&wparam(4));	# get dl
734	&and($num,7);
735	&jz(&label("pw_end"));
736
737	for ($i=0; $i<7; $i++)
738	{
739	    &comment("dl>0 Tail Round $i");
740	    &mov($tmp1,&DWP($i*4,$a,"",0));	# *a
741	    &sub($tmp1,$c);
742	    &mov(&DWP($i*4,$r,"",0),$tmp1);	# *r
743	    &jnc(&label("pw_tail_nc".$i));
744	    &dec($num) if ($i != 6);
745	    &jz(&label("pw_end")) if ($i != 6);
746	}
747	&mov($c,1);
748	&jmp(&label("pw_end"));
749
750	&set_label("pw_nc_loop",0);
751	for ($i=0; $i<8; $i++)
752	{
753	    &mov($tmp1,&DWP($i*4,$a,"",0));	# *a
754	    &mov(&DWP($i*4,$r,"",0),$tmp1);	# *r
755	    &set_label("pw_nc".$i,0);
756	}
757
758	&comment("");
759	&add($a,32);
760	&add($r,32);
761	&sub($num,8);
762	&jnz(&label("pw_nc_loop"));
763
764	&mov($num,&wparam(4));	# get dl
765	&and($num,7);
766	&jz(&label("pw_nc_end"));
767
768	for ($i=0; $i<7; $i++)
769	{
770	    &mov($tmp1,&DWP($i*4,$a,"",0));	# *a
771	    &mov(&DWP($i*4,$r,"",0),$tmp1);	# *r
772	    &set_label("pw_tail_nc".$i,0);
773	    &dec($num) if ($i != 6);
774	    &jz(&label("pw_nc_end")) if ($i != 6);
775	}
776
777	&set_label("pw_nc_end",0);
778	&mov($c,0);
779
780	&set_label("pw_end",0);
781
782#	&mov("eax",$c);		# $c is "eax"
783
784	&function_end($name);
785	}
786