summaryrefslogtreecommitdiff
path: root/arch/x86/math-emu/reg_round.S
blob: 41af5b208d88f5b6975162c27a05bf9b7ad06d4a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
	.file "reg_round.S"
/*---------------------------------------------------------------------------+
 |  reg_round.S                                                              |
 |                                                                           |
 | Rounding/truncation/etc for FPU basic arithmetic functions.               |
 |                                                                           |
 | Copyright (C) 1993,1995,1997                                              |
 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
 |                       Australia.  E-mail billm@suburbia.net               |
 |                                                                           |
 | This code has four possible entry points.                                 |
 | The following must be entered by a jmp instruction:                       |
 |   fpu_reg_round, fpu_reg_round_sqrt, and fpu_Arith_exit.                  |
 |                                                                           |
 | The FPU_round entry point is intended to be used by C code.               |
 | From C, call as:                                                          |
 |  int FPU_round(FPU_REG *arg, unsigned int extent, unsigned int control_w) |
 |                                                                           |
 |    Return value is the tag of the answer, or-ed with FPU_Exception if     |
 |    one was raised, or -1 on internal error.                               |
 |                                                                           |
 | For correct "up" and "down" rounding, the argument must have the correct  |
 | sign.                                                                     |
 |                                                                           |
 +---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------+
 | Four entry points.                                                        |
 |                                                                           |
 | Needed by both the fpu_reg_round and fpu_reg_round_sqrt entry points:     |
 |  %eax:%ebx  64 bit significand                                            |
 |  %edx       32 bit extension of the significand                           |
 |  %edi       pointer to an FPU_REG for the result to be stored             |
 |  stack      calling function must have set up a C stack frame and         |
 |             pushed %esi, %edi, and %ebx                                   |
 |                                                                           |
 | Needed just for the fpu_reg_round_sqrt entry point:                       |
 |  %cx  A control word in the same format as the FPU control word.          |
 | Otherwise, PARAM4 must give such a value.                                 |
 |                                                                           |
 |                                                                           |
 | The significand and its extension are assumed to be exact in the          |
 | following sense:                                                          |
 |   If the significand by itself is the exact result then the significand   |
 |   extension (%edx) must contain 0, otherwise the significand extension    |
 |   must be non-zero.                                                       |
 |   If the significand extension is non-zero then the significand is        |
 |   smaller than the magnitude of the correct exact result by an amount     |
 |   greater than zero and less than one ls bit of the significand.          |
 |   The significand extension is only required to have three possible       |
 |   non-zero values:                                                        |
 |       less than 0x80000000  <=> the significand is less than 1/2 an ls    |
 |                                 bit smaller than the magnitude of the     |
 |                                 true exact result.                        |
 |         exactly 0x80000000  <=> the significand is exactly 1/2 an ls bit  |
 |                                 smaller than the magnitude of the true    |
 |                                 exact result.                             |
 |    greater than 0x80000000  <=> the significand is more than 1/2 an ls    |
 |                                 bit smaller than the magnitude of the     |
 |                                 true exact result.                        |
 |                                                                           |
 +---------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------+
 |  The code in this module has become quite complex, but it should handle   |
 |  all of the FPU flags which are set at this stage of the basic arithmetic |
 |  computations.                                                            |
 |  There are a few rare cases where the results are not set identically to  |
 |  a real FPU. These require a bit more thought because at this stage the   |
 |  results of the code here appear to be more consistent...                 |
 |  This may be changed in a future version.                                 |
 +---------------------------------------------------------------------------*/


#include "fpu_emu.h"
#include "exception.h"
#include "control_w.h"

/* Flags for FPU_bits_lost */
#define	LOST_DOWN	$1
#define	LOST_UP		$2

/* Flags for FPU_denormal */
#define	DENORMAL	$1
#define	UNMASKED_UNDERFLOW $2


#ifndef NON_REENTRANT_FPU
/*	Make the code re-entrant by putting
	local storage on the stack: */
#define FPU_bits_lost	(%esp)
#define FPU_denormal	1(%esp)

#else
/*	Not re-entrant, so we can gain speed by putting
	local storage in a static area: */
.data
	.align 4,0
FPU_bits_lost:
	.byte	0
FPU_denormal:
	.byte	0
#endif /* NON_REENTRANT_FPU */


.text
.globl fpu_reg_round
.globl fpu_Arith_exit

/* Entry point when called from C */
ENTRY(FPU_round)
	pushl	%ebp
	movl	%esp,%ebp
	pushl	%esi
	pushl	%edi
	pushl	%ebx

	movl	PARAM1,%edi
	movl	SIGH(%edi),%eax
	movl	SIGL(%edi),%ebx
	movl	PARAM2,%edx

fpu_reg_round:			/* Normal entry point */
	movl	PARAM4,%ecx

#ifndef NON_REENTRANT_FPU
	pushl	%ebx		/* adjust the stack pointer */
#endif /* NON_REENTRANT_FPU */ 

#ifdef PARANOID
/* Cannot use this here yet */
/*	orl	%eax,%eax */
/*	jns	L_entry_bugged */
#endif /* PARANOID */

	cmpw	EXP_UNDER,EXP(%edi)
	jle	L_Make_denorm			/* The number is a de-normal */

	movb	$0,FPU_denormal			/* 0 -> not a de-normal */

Denorm_done:
	movb	$0,FPU_bits_lost		/* No bits yet lost in rounding */

	movl	%ecx,%esi
	andl	CW_PC,%ecx
	cmpl	PR_64_BITS,%ecx
	je	LRound_To_64

	cmpl	PR_53_BITS,%ecx
	je	LRound_To_53

	cmpl	PR_24_BITS,%ecx
	je	LRound_To_24

#ifdef PECULIAR_486
/* With the precision control bits set to 01 "(reserved)", a real 80486
   behaves as if the precision control bits were set to 11 "64 bits" */
	cmpl	PR_RESERVED_BITS,%ecx
	je	LRound_To_64
#ifdef PARANOID
	jmp	L_bugged_denorm_486
#endif /* PARANOID */ 
#else
#ifdef PARANOID
	jmp	L_bugged_denorm	/* There is no bug, just a bad control word */
#endif /* PARANOID */ 
#endif /* PECULIAR_486 */


/* Round etc to 24 bit precision */
LRound_To_24:
	movl	%esi,%ecx
	andl	CW_RC,%ecx
	cmpl	RC_RND,%ecx
	je	LRound_nearest_24

	cmpl	RC_CHOP,%ecx
	je	LCheck_truncate_24

	cmpl	RC_UP,%ecx		/* Towards +infinity */
	je	LUp_24

	cmpl	RC_DOWN,%ecx		/* Towards -infinity */
	je	LDown_24

#ifdef PARANOID
	jmp	L_bugged_round24
#endif /* PARANOID */ 

LUp_24:
	cmpb	SIGN_POS,PARAM5
	jne	LCheck_truncate_24	/* If negative then  up==truncate */

	jmp	LCheck_24_round_up

LDown_24:
	cmpb	SIGN_POS,PARAM5
	je	LCheck_truncate_24	/* If positive then  down==truncate */

LCheck_24_round_up:
	movl	%eax,%ecx
	andl	$0x000000ff,%ecx
	orl	%ebx,%ecx
	orl	%edx,%ecx
	jnz	LDo_24_round_up
	jmp	L_Re_normalise

LRound_nearest_24:
	/* Do rounding of the 24th bit if needed (nearest or even) */
	movl	%eax,%ecx
	andl	$0x000000ff,%ecx
	cmpl	$0x00000080,%ecx
	jc	LCheck_truncate_24	/* less than half, no increment needed */

	jne	LGreater_Half_24	/* greater than half, increment needed */

	/* Possibly half, we need to check the ls bits */
	orl	%ebx,%ebx
	jnz	LGreater_Half_24	/* greater than half, increment needed */

	orl	%edx,%edx
	jnz	LGreater_Half_24	/* greater than half, increment needed */

	/* Exactly half, increment only if 24th bit is 1 (round to even) */
	testl	$0x00000100,%eax
	jz	LDo_truncate_24

LGreater_Half_24:			/* Rounding: increment at the 24th bit */
LDo_24_round_up:
	andl	$0xffffff00,%eax	/* Truncate to 24 bits */
	xorl	%ebx,%ebx
	movb	LOST_UP,FPU_bits_lost
	addl	$0x00000100,%eax
	jmp	LCheck_Round_Overflow

LCheck_truncate_24:
	movl	%eax,%ecx
	andl	$0x000000ff,%ecx
	orl	%ebx,%ecx
	orl	%edx,%ecx
	jz	L_Re_normalise		/* No truncation needed */

LDo_truncate_24:
	andl	$0xffffff00,%eax	/* Truncate to 24 bits */
	xorl	%ebx,%ebx
	movb	LOST_DOWN,FPU_bits_lost
	jmp	L_Re_normalise


/* Round etc to 53 bit precision */
LRound_To_53:
	movl	%esi,%ecx
	andl	CW_RC,%ecx
	cmpl	RC_RND,%ecx
	je	LRound_nearest_53

	cmpl	RC_CHOP,%ecx
	je	LCheck_truncate_53

	cmpl	RC_UP,%ecx		/* Towards +infinity */
	je	LUp_53

	cmpl	RC_DOWN,%ecx		/* Towards -infinity */
	je	LDown_53

#ifdef PARANOID
	jmp	L_bugged_round53
#endif /* PARANOID */ 

LUp_53:
	cmpb	SIGN_POS,PARAM5
	jne	LCheck_truncate_53	/* If negative then  up==truncate */

	jmp	LCheck_53_round_up

LDown_53:
	cmpb	SIGN_POS,PARAM5
	je	LCheck_truncate_53	/* If positive then  down==truncate */

LCheck_53_round_up:
	movl	%ebx,%ecx
	andl	$0x000007ff,%ecx
	orl	%edx,%ecx
	jnz	LDo_53_round_up
	jmp	L_Re_normalise

LRound_nearest_53:
	/* Do rounding of the 53rd bit if needed (nearest or even) */
	movl	%ebx,%ecx
	andl	$0x000007ff,%ecx
	cmpl	$0x00000400,%ecx
	jc	LCheck_truncate_53	/* less than half, no increment needed */

	jnz	LGreater_Half_53	/* greater than half, increment needed */

	/* Possibly half, we need to check the ls bits */
	orl	%edx,%edx
	jnz	LGreater_Half_53	/* greater than half, increment needed */

	/* Exactly half, increment only if 53rd bit is 1 (round to even) */
	testl	$0x00000800,%ebx
	jz	LTruncate_53

LGreater_Half_53:			/* Rounding: increment at the 53rd bit */
LDo_53_round_up:
	movb	LOST_UP,FPU_bits_lost
	andl	$0xfffff800,%ebx	/* Truncate to 53 bits */
	addl	$0x00000800,%ebx
	adcl	$0,%eax
	jmp	LCheck_Round_Overflow

LCheck_truncate_53:
	movl	%ebx,%ecx
	andl	$0x000007ff,%ecx
	orl	%edx,%ecx
	jz	L_Re_normalise

LTruncate_53:
	movb	LOST_DOWN,FPU_bits_lost
	andl	$0xfffff800,%ebx	/* Truncate to 53 bits */
	jmp	L_Re_normalise


/* Round etc to 64 bit precision */
LRound_To_64:
	movl	%esi,%ecx
	andl	CW_RC,%ecx
	cmpl	RC_RND,%ecx
	je	LRound_nearest_64

	cmpl	RC_CHOP,%ecx
	je	LCheck_truncate_64

	cmpl	RC_UP,%ecx		/* Towards +infinity */
	je	LUp_64

	cmpl	RC_DOWN,%ecx		/* Towards -infinity */
	je	LDown_64

#ifdef PARANOID
	jmp	L_bugged_round64
#endif /* PARANOID */ 

LUp_64:
	cmpb	SIGN_POS,PARAM5
	jne	LCheck_truncate_64	/* If negative then  up==truncate */

	orl	%edx,%edx
	jnz	LDo_64_round_up
	jmp	L_Re_normalise

LDown_64:
	cmpb	SIGN_POS,PARAM5
	je	LCheck_truncate_64	/* If positive then  down==truncate */

	orl	%edx,%edx
	jnz	LDo_64_round_up
	jmp	L_Re_normalise

LRound_nearest_64:
	cmpl	$0x80000000,%edx
	jc	LCheck_truncate_64

	jne	LDo_64_round_up

	/* Now test for round-to-even */
	testb	$1,%bl
	jz	LCheck_truncate_64

LDo_64_round_up:
	movb	LOST_UP,FPU_bits_lost
	addl	$1,%ebx
	adcl	$0,%eax

LCheck_Round_Overflow:
	jnc	L_Re_normalise

	/* Overflow, adjust the result (significand to 1.0) */
	rcrl	$1,%eax
	rcrl	$1,%ebx
	incw	EXP(%edi)
	jmp	L_Re_normalise

LCheck_truncate_64:
	orl	%edx,%edx
	jz	L_Re_normalise

LTruncate_64:
	movb	LOST_DOWN,FPU_bits_lost

L_Re_normalise:
	testb	$0xff,FPU_denormal
	jnz	Normalise_result

L_Normalised:
	movl	TAG_Valid,%edx

L_deNormalised:
	cmpb	LOST_UP,FPU_bits_lost
	je	L_precision_lost_up

	cmpb	LOST_DOWN,FPU_bits_lost
	je	L_precision_lost_down

L_no_precision_loss:
	/* store the result */

L_Store_significand:
	movl	%eax,SIGH(%edi)
	movl	%ebx,SIGL(%edi)

	cmpw	EXP_OVER,EXP(%edi)
	jge	L_overflow

	movl	%edx,%eax

	/* Convert the exponent to 80x87 form. */
	addw	EXTENDED_Ebias,EXP(%edi)
	andw	$0x7fff,EXP(%edi)

fpu_reg_round_signed_special_exit:

	cmpb	SIGN_POS,PARAM5
	je	fpu_reg_round_special_exit

	orw	$0x8000,EXP(%edi)	/* Negative sign for the result. */

fpu_reg_round_special_exit:

#ifndef NON_REENTRANT_FPU
	popl	%ebx		/* adjust the stack pointer */
#endif /* NON_REENTRANT_FPU */ 

fpu_Arith_exit:
	popl	%ebx
	popl	%edi
	popl	%esi
	leave
	ret


/*
 * Set the FPU status flags to represent precision loss due to
 * round-up.
 */
L_precision_lost_up:
	push	%edx
	push	%eax
	call	set_precision_flag_up
	popl	%eax
	popl	%edx
	jmp	L_no_precision_loss

/*
 * Set the FPU status flags to represent precision loss due to
 * truncation.
 */
L_precision_lost_down:
	push	%edx
	push	%eax
	call	set_precision_flag_down
	popl	%eax
	popl	%edx
	jmp	L_no_precision_loss


/*
 * The number is a denormal (which might get rounded up to a normal)
 * Shift the number right the required number of bits, which will
 * have to be undone later...
 */
L_Make_denorm:
	/* The action to be taken depends upon whether the underflow
	   exception is masked */
	testb	CW_Underflow,%cl		/* Underflow mask. */
	jz	Unmasked_underflow		/* Do not make a denormal. */

	movb	DENORMAL,FPU_denormal

	pushl	%ecx		/* Save */
	movw	EXP_UNDER+1,%cx
	subw	EXP(%edi),%cx

	cmpw	$64,%cx	/* shrd only works for 0..31 bits */
	jnc	Denorm_shift_more_than_63

	cmpw	$32,%cx	/* shrd only works for 0..31 bits */
	jnc	Denorm_shift_more_than_32

/*
 * We got here without jumps by assuming that the most common requirement
 *   is for a small de-normalising shift.
 * Shift by [1..31] bits
 */
	addw	%cx,EXP(%edi)
	orl	%edx,%edx	/* extension */
	setne	%ch		/* Save whether %edx is non-zero */
	xorl	%edx,%edx
	shrd	%cl,%ebx,%edx
	shrd	%cl,%eax,%ebx
	shr	%cl,%eax
	orb	%ch,%dl
	popl	%ecx
	jmp	Denorm_done

/* Shift by [32..63] bits */
Denorm_shift_more_than_32:
	addw	%cx,EXP(%edi)
	subb	$32,%cl
	orl	%edx,%edx
	setne	%ch
	orb	%ch,%bl
	xorl	%edx,%edx
	shrd	%cl,%ebx,%edx
	shrd	%cl,%eax,%ebx
	shr	%cl,%eax
	orl	%edx,%edx		/* test these 32 bits */
	setne	%cl
	orb	%ch,%bl
	orb	%cl,%bl
	movl	%ebx,%edx
	movl	%eax,%ebx
	xorl	%eax,%eax
	popl	%ecx
	jmp	Denorm_done

/* Shift by [64..) bits */
Denorm_shift_more_than_63:
	cmpw	$64,%cx
	jne	Denorm_shift_more_than_64

/* Exactly 64 bit shift */
	addw	%cx,EXP(%edi)
	xorl	%ecx,%ecx
	orl	%edx,%edx
	setne	%cl
	orl	%ebx,%ebx
	setne	%ch
	orb	%ch,%cl
	orb	%cl,%al
	movl	%eax,%edx
	xorl	%eax,%eax
	xorl	%ebx,%ebx
	popl	%ecx
	jmp	Denorm_done

Denorm_shift_more_than_64:
	movw	EXP_UNDER+1,EXP(%edi)
/* This is easy, %eax must be non-zero, so.. */
	movl	$1,%edx
	xorl	%eax,%eax
	xorl	%ebx,%ebx
	popl	%ecx
	jmp	Denorm_done


Unmasked_underflow:
	movb	UNMASKED_UNDERFLOW,FPU_denormal
	jmp	Denorm_done


/* Undo the de-normalisation. */
Normalise_result:
	cmpb	UNMASKED_UNDERFLOW,FPU_denormal
	je	Signal_underflow

/* The number must be a denormal if we got here. */
#ifdef PARANOID
	/* But check it... just in case. */
	cmpw	EXP_UNDER+1,EXP(%edi)
	jne	L_norm_bugged
#endif /* PARANOID */

#ifdef PECULIAR_486
	/*
	 * This implements a special feature of 80486 behaviour.
	 * Underflow will be signalled even if the number is
	 * not a denormal after rounding.
	 * This difference occurs only for masked underflow, and not
	 * in the unmasked case.
	 * Actual 80486 behaviour differs from this in some circumstances.
	 */
	orl	%eax,%eax		/* ms bits */
	js	LPseudoDenormal		/* Will be masked underflow */
#else
	orl	%eax,%eax		/* ms bits */
	js	L_Normalised		/* No longer a denormal */
#endif /* PECULIAR_486 */ 

	jnz	LDenormal_adj_exponent

	orl	%ebx,%ebx
	jz	L_underflow_to_zero	/* The contents are zero */

LDenormal_adj_exponent:
	decw	EXP(%edi)

LPseudoDenormal:
	testb	$0xff,FPU_bits_lost	/* bits lost == underflow */
	movl	TAG_Special,%edx
	jz	L_deNormalised

	/* There must be a masked underflow */
	push	%eax
	pushl	EX_Underflow
	call	EXCEPTION
	popl	%eax
	popl	%eax
	movl	TAG_Special,%edx
	jmp	L_deNormalised


/*
 * The operations resulted in a number too small to represent.
 * Masked response.
 */
L_underflow_to_zero:
	push	%eax
	call	set_precision_flag_down
	popl	%eax

	push	%eax
	pushl	EX_Underflow
	call	EXCEPTION
	popl	%eax
	popl	%eax

/* Reduce the exponent to EXP_UNDER */
	movw	EXP_UNDER,EXP(%edi)
	movl	TAG_Zero,%edx
	jmp	L_Store_significand


/* The operations resulted in a number too large to represent. */
L_overflow:
	addw	EXTENDED_Ebias,EXP(%edi)	/* Set for unmasked response. */
	push	%edi
	call	arith_overflow
	pop	%edi
	jmp	fpu_reg_round_signed_special_exit


Signal_underflow:
	/* The number may have been changed to a non-denormal */
	/* by the rounding operations. */
	cmpw	EXP_UNDER,EXP(%edi)
	jle	Do_unmasked_underflow

	jmp	L_Normalised

Do_unmasked_underflow:
	/* Increase the exponent by the magic number */
	addw	$(3*(1<<13)),EXP(%edi)
	push	%eax
	pushl	EX_Underflow
	call	EXCEPTION
	popl	%eax
	popl	%eax
	jmp	L_Normalised


#ifdef PARANOID
#ifdef PECULIAR_486
L_bugged_denorm_486:
	pushl	EX_INTERNAL|0x236
	call	EXCEPTION
	popl	%ebx
	jmp	L_exception_exit
#else
L_bugged_denorm:
	pushl	EX_INTERNAL|0x230
	call	EXCEPTION
	popl	%ebx
	jmp	L_exception_exit
#endif /* PECULIAR_486 */ 

L_bugged_round24:
	pushl	EX_INTERNAL|0x231
	call	EXCEPTION
	popl	%ebx
	jmp	L_exception_exit

L_bugged_round53:
	pushl	EX_INTERNAL|0x232
	call	EXCEPTION
	popl	%ebx
	jmp	L_exception_exit

L_bugged_round64:
	pushl	EX_INTERNAL|0x233
	call	EXCEPTION
	popl	%ebx
	jmp	L_exception_exit

L_norm_bugged:
	pushl	EX_INTERNAL|0x234
	call	EXCEPTION
	popl	%ebx
	jmp	L_exception_exit

L_entry_bugged:
	pushl	EX_INTERNAL|0x235
	call	EXCEPTION
	popl	%ebx
L_exception_exit:
	mov	$-1,%eax
	jmp	fpu_reg_round_special_exit
#endif /* PARANOID */ 

ENDPROC(FPU_round)