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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [i386/] [math-emu/] [reg_compare.c] - Blame information for rev 1765

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/*---------------------------------------------------------------------------+
 |  reg_compare.c                                                            |
 |                                                                           |
 | Compare two floating point registers                                      |
 |                                                                           |
 | Copyright (C) 1992,1993,1994                                              |
 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
 |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
 |                                                                           |
 |                                                                           |
 +---------------------------------------------------------------------------*/
 
/*---------------------------------------------------------------------------+
 | compare() is the core FPU_REG comparison function                         |
 +---------------------------------------------------------------------------*/
 
#include "fpu_system.h"
#include "exception.h"
#include "fpu_emu.h"
#include "control_w.h"
#include "status_w.h"
 
 
int compare(FPU_REG const *b)
{
  int diff;
  char         st0_tag;
  FPU_REG      *st0_ptr;
 
  st0_ptr = &st(0);
  st0_tag = st0_ptr->tag;
 
  if ( st0_tag | b->tag )
    {
      if ( st0_tag == TW_Zero )
        {
          if ( b->tag == TW_Zero ) return COMP_A_eq_B;
          if ( b->tag == TW_Valid )
            {
              return ((b->sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
#ifdef DENORM_OPERAND
                | ((b->exp <= EXP_UNDER) ?
                   COMP_Denormal : 0)
#endif DENORM_OPERAND
                  ;
            }
        }
      else if ( b->tag == TW_Zero )
        {
          if ( st0_tag == TW_Valid )
            {
              return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B
                      : COMP_A_lt_B)
#ifdef DENORM_OPERAND
                | ((st0_ptr->exp <= EXP_UNDER )
                   ? COMP_Denormal : 0 )
#endif DENORM_OPERAND
                  ;
            }
        }
 
      if ( st0_tag == TW_Infinity )
        {
          if ( (b->tag == TW_Valid) || (b->tag == TW_Zero) )
            {
              return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B
                      : COMP_A_lt_B)
#ifdef DENORM_OPERAND
              | (((b->tag == TW_Valid) && (b->exp <= EXP_UNDER)) ?
                COMP_Denormal : 0 )
#endif DENORM_OPERAND
;
            }
          else if ( b->tag == TW_Infinity )
            {
              /* The 80486 book says that infinities can be equal! */
              return (st0_ptr->sign == b->sign) ? COMP_A_eq_B :
                ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);
            }
          /* Fall through to the NaN code */
        }
      else if ( b->tag == TW_Infinity )
        {
          if ( (st0_tag == TW_Valid) || (st0_tag == TW_Zero) )
            {
              return ((b->sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
#ifdef DENORM_OPERAND
                | (((st0_tag == TW_Valid)
                    && (st0_ptr->exp <= EXP_UNDER)) ?
                   COMP_Denormal : 0)
#endif DENORM_OPERAND
                  ;
            }
          /* Fall through to the NaN code */
        }
 
      /* The only possibility now should be that one of the arguments
         is a NaN */
      if ( (st0_tag == TW_NaN) || (b->tag == TW_NaN) )
        {
          if ( ((st0_tag == TW_NaN) && !(st0_ptr->sigh & 0x40000000))
              || ((b->tag == TW_NaN) && !(b->sigh & 0x40000000)) )
            /* At least one arg is a signaling NaN */
            return COMP_No_Comp | COMP_SNaN | COMP_NaN;
          else
            /* Neither is a signaling NaN */
            return COMP_No_Comp | COMP_NaN;
        }
 
      EXCEPTION(EX_Invalid);
    }
 
#ifdef PARANOID
  if (!(st0_ptr->sigh & 0x80000000)) EXCEPTION(EX_Invalid);
  if (!(b->sigh & 0x80000000)) EXCEPTION(EX_Invalid);
#endif PARANOID
 
 
  if (st0_ptr->sign != b->sign)
    {
      return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
#ifdef DENORM_OPERAND
        |
          ( ((st0_ptr->exp <= EXP_UNDER) || (b->exp <= EXP_UNDER)) ?
           COMP_Denormal : 0)
#endif DENORM_OPERAND
            ;
    }
 
  diff = st0_ptr->exp - b->exp;
  if ( diff == 0 )
    {
      diff = st0_ptr->sigh - b->sigh;  /* Works only if ms bits are
                                              identical */
      if ( diff == 0 )
        {
        diff = st0_ptr->sigl > b->sigl;
        if ( diff == 0 )
          diff = -(st0_ptr->sigl < b->sigl);
        }
    }
 
  if ( diff > 0 )
    {
      return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)
#ifdef DENORM_OPERAND
        |
          ( ((st0_ptr->exp <= EXP_UNDER) || (b->exp <= EXP_UNDER)) ?
           COMP_Denormal : 0)
#endif DENORM_OPERAND
            ;
    }
  if ( diff < 0 )
    {
      return ((st0_ptr->sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)
#ifdef DENORM_OPERAND
        |
          ( ((st0_ptr->exp <= EXP_UNDER) || (b->exp <= EXP_UNDER)) ?
           COMP_Denormal : 0)
#endif DENORM_OPERAND
            ;
    }
 
  return COMP_A_eq_B
#ifdef DENORM_OPERAND
    |
      ( ((st0_ptr->exp <= EXP_UNDER) || (b->exp <= EXP_UNDER)) ?
       COMP_Denormal : 0)
#endif DENORM_OPERAND
        ;
 
}
 
 
/* This function requires that st(0) is not empty */
int compare_st_data(FPU_REG const *loaded_data)
{
  int f, c;
 
  c = compare(loaded_data);
 
  if (c & COMP_NaN)
    {
      EXCEPTION(EX_Invalid);
      f = SW_C3 | SW_C2 | SW_C0;
    }
  else
    switch (c & 7)
      {
      case COMP_A_lt_B:
        f = SW_C0;
        break;
      case COMP_A_eq_B:
        f = SW_C3;
        break;
      case COMP_A_gt_B:
        f = 0;
        break;
      case COMP_No_Comp:
        f = SW_C3 | SW_C2 | SW_C0;
        break;
#ifdef PARANOID
      default:
        EXCEPTION(EX_INTERNAL|0x121);
        f = SW_C3 | SW_C2 | SW_C0;
        break;
#endif PARANOID
      }
  setcc(f);
  if (c & COMP_Denormal)
    {
      return denormal_operand();
    }
  return 0;
}
 
 
static int compare_st_st(int nr)
{
  int f, c;
 
  if ( !NOT_EMPTY(0) || !NOT_EMPTY(nr) )
    {
      setcc(SW_C3 | SW_C2 | SW_C0);
      /* Stack fault */
      EXCEPTION(EX_StackUnder);
      return !(control_word & CW_Invalid);
    }
 
  c = compare(&st(nr));
  if (c & COMP_NaN)
    {
      setcc(SW_C3 | SW_C2 | SW_C0);
      EXCEPTION(EX_Invalid);
      return !(control_word & CW_Invalid);
    }
  else
    switch (c & 7)
      {
      case COMP_A_lt_B:
        f = SW_C0;
        break;
      case COMP_A_eq_B:
        f = SW_C3;
        break;
      case COMP_A_gt_B:
        f = 0;
        break;
      case COMP_No_Comp:
        f = SW_C3 | SW_C2 | SW_C0;
        break;
#ifdef PARANOID
      default:
        EXCEPTION(EX_INTERNAL|0x122);
        f = SW_C3 | SW_C2 | SW_C0;
        break;
#endif PARANOID
      }
  setcc(f);
  if (c & COMP_Denormal)
    {
      return denormal_operand();
    }
  return 0;
}
 
 
static int compare_u_st_st(int nr)
{
  int f, c;
 
  if ( !NOT_EMPTY(0) || !NOT_EMPTY(nr) )
    {
      setcc(SW_C3 | SW_C2 | SW_C0);
      /* Stack fault */
      EXCEPTION(EX_StackUnder);
      return !(control_word & CW_Invalid);
    }
 
  c = compare(&st(nr));
  if (c & COMP_NaN)
    {
      setcc(SW_C3 | SW_C2 | SW_C0);
      if (c & COMP_SNaN)       /* This is the only difference between
                                  un-ordered and ordinary comparisons */
        {
          EXCEPTION(EX_Invalid);
          return !(control_word & CW_Invalid);
        }
      return 0;
    }
  else
    switch (c & 7)
      {
      case COMP_A_lt_B:
        f = SW_C0;
        break;
      case COMP_A_eq_B:
        f = SW_C3;
        break;
      case COMP_A_gt_B:
        f = 0;
        break;
      case COMP_No_Comp:
        f = SW_C3 | SW_C2 | SW_C0;
        break;
#ifdef PARANOID
      default:
        EXCEPTION(EX_INTERNAL|0x123);
        f = SW_C3 | SW_C2 | SW_C0;
        break;
#endif PARANOID
      }
  setcc(f);
  if (c & COMP_Denormal)
    {
      return denormal_operand();
    }
  return 0;
}
 
/*---------------------------------------------------------------------------*/
 
void fcom_st()
{
  /* fcom st(i) */
  compare_st_st(FPU_rm);
}
 
 
void fcompst()
{
  /* fcomp st(i) */
  if ( !compare_st_st(FPU_rm) )
    pop();
}
 
 
void fcompp()
{
  /* fcompp */
  if (FPU_rm != 1)
    {
      FPU_illegal();
      return;
    }
  if ( !compare_st_st(1) )
      poppop();
}
 
 
void fucom_()
{
  /* fucom st(i) */
  compare_u_st_st(FPU_rm);
 
}
 
 
void fucomp()
{
  /* fucomp st(i) */
  if ( !compare_u_st_st(FPU_rm) )
    pop();
}
 
 
void fucompp()
{
  /* fucompp */
  if (FPU_rm == 1)
    {
      if ( !compare_u_st_st(1) )
        poppop();
    }
  else
    FPU_illegal();
}

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [i386/] [math-emu/] [reg_compare.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1623	jcastillo	`/*---------------------------------------------------------------------------+`
2			`\| reg_compare.c \|`
3			`\| \|`
4			`\| Compare two floating point registers \|`
5			`\| \|`
6			`\| Copyright (C) 1992,1993,1994 \|`
7			`\| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, \|`
8			`\| Australia. E-mail billm@vaxc.cc.monash.edu.au \|`
9			`\| \|`
10			`\| \|`
11			`+---------------------------------------------------------------------------*/`
12
13			`/*---------------------------------------------------------------------------+`
14			`\| compare() is the core FPU_REG comparison function \|`
15			`+---------------------------------------------------------------------------*/`
16
17			`#include "fpu_system.h"`
18			`#include "exception.h"`
19			`#include "fpu_emu.h"`
20			`#include "control_w.h"`
21			`#include "status_w.h"`
22
23
24			`int compare(FPU_REG const *b)`
25			`{`
26			`int diff;`
27			`char st0_tag;`
28			`FPU_REG *st0_ptr;`
29
30			`st0_ptr = &st(0);`
31			`st0_tag = st0_ptr->tag;`
32
33			`if ( st0_tag \| b->tag )`
34			`{`
35			`if ( st0_tag == TW_Zero )`
36			`{`
37			`if ( b->tag == TW_Zero ) return COMP_A_eq_B;`
38			`if ( b->tag == TW_Valid )`
39			`{`
40			`return ((b->sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)`
41			`#ifdef DENORM_OPERAND`
42			`\| ((b->exp <= EXP_UNDER) ?`
43			`COMP_Denormal : 0)`
44			`#endif DENORM_OPERAND`
45			`;`
46			`}`
47			`}`
48			`else if ( b->tag == TW_Zero )`
49			`{`
50			`if ( st0_tag == TW_Valid )`
51			`{`
52			`return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B`
53			`: COMP_A_lt_B)`
54			`#ifdef DENORM_OPERAND`
55			`\| ((st0_ptr->exp <= EXP_UNDER )`
56			`? COMP_Denormal : 0 )`
57			`#endif DENORM_OPERAND`
58			`;`
59			`}`
60			`}`
61
62			`if ( st0_tag == TW_Infinity )`
63			`{`
64			`if ( (b->tag == TW_Valid) \|\| (b->tag == TW_Zero) )`
65			`{`
66			`return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B`
67			`: COMP_A_lt_B)`
68			`#ifdef DENORM_OPERAND`
69			`\| (((b->tag == TW_Valid) && (b->exp <= EXP_UNDER)) ?`
70			`COMP_Denormal : 0 )`
71			`#endif DENORM_OPERAND`
72			`;`
73			`}`
74			`else if ( b->tag == TW_Infinity )`
75			`{`
76			`/* The 80486 book says that infinities can be equal! */`
77			`return (st0_ptr->sign == b->sign) ? COMP_A_eq_B :`
78			`((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B);`
79			`}`
80			`/* Fall through to the NaN code */`
81			`}`
82			`else if ( b->tag == TW_Infinity )`
83			`{`
84			`if ( (st0_tag == TW_Valid) \|\| (st0_tag == TW_Zero) )`
85			`{`
86			`return ((b->sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)`
87			`#ifdef DENORM_OPERAND`
88			`\| (((st0_tag == TW_Valid)`
89			`&& (st0_ptr->exp <= EXP_UNDER)) ?`
90			`COMP_Denormal : 0)`
91			`#endif DENORM_OPERAND`
92			`;`
93			`}`
94			`/* Fall through to the NaN code */`
95			`}`
96
97			`/* The only possibility now should be that one of the arguments`
98			`is a NaN */`
99			`if ( (st0_tag == TW_NaN) \|\| (b->tag == TW_NaN) )`
100			`{`
101			`if ( ((st0_tag == TW_NaN) && !(st0_ptr->sigh & 0x40000000))`
102			`\|\| ((b->tag == TW_NaN) && !(b->sigh & 0x40000000)) )`
103			`/* At least one arg is a signaling NaN */`
104			`return COMP_No_Comp \| COMP_SNaN \| COMP_NaN;`
105			`else`
106			`/* Neither is a signaling NaN */`
107			`return COMP_No_Comp \| COMP_NaN;`
108			`}`
109
110			`EXCEPTION(EX_Invalid);`
111			`}`
112
113			`#ifdef PARANOID`
114			`if (!(st0_ptr->sigh & 0x80000000)) EXCEPTION(EX_Invalid);`
115			`if (!(b->sigh & 0x80000000)) EXCEPTION(EX_Invalid);`
116			`#endif PARANOID`
117
118
119			`if (st0_ptr->sign != b->sign)`
120			`{`
121			`return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)`
122			`#ifdef DENORM_OPERAND`
123			`\|`
124			`( ((st0_ptr->exp <= EXP_UNDER) \|\| (b->exp <= EXP_UNDER)) ?`
125			`COMP_Denormal : 0)`
126			`#endif DENORM_OPERAND`
127			`;`
128			`}`
129
130			`diff = st0_ptr->exp - b->exp;`
131			`if ( diff == 0 )`
132			`{`
133			`diff = st0_ptr->sigh - b->sigh; /* Works only if ms bits are`
134			`identical */`
135			`if ( diff == 0 )`
136			`{`
137			`diff = st0_ptr->sigl > b->sigl;`
138			`if ( diff == 0 )`
139			`diff = -(st0_ptr->sigl < b->sigl);`
140			`}`
141			`}`
142
143			`if ( diff > 0 )`
144			`{`
145			`return ((st0_ptr->sign == SIGN_POS) ? COMP_A_gt_B : COMP_A_lt_B)`
146			`#ifdef DENORM_OPERAND`
147			`\|`
148			`( ((st0_ptr->exp <= EXP_UNDER) \|\| (b->exp <= EXP_UNDER)) ?`
149			`COMP_Denormal : 0)`
150			`#endif DENORM_OPERAND`
151			`;`
152			`}`
153			`if ( diff < 0 )`
154			`{`
155			`return ((st0_ptr->sign == SIGN_POS) ? COMP_A_lt_B : COMP_A_gt_B)`
156			`#ifdef DENORM_OPERAND`
157			`\|`
158			`( ((st0_ptr->exp <= EXP_UNDER) \|\| (b->exp <= EXP_UNDER)) ?`
159			`COMP_Denormal : 0)`
160			`#endif DENORM_OPERAND`
161			`;`
162			`}`
163
164			`return COMP_A_eq_B`
165			`#ifdef DENORM_OPERAND`
166			`\|`
167			`( ((st0_ptr->exp <= EXP_UNDER) \|\| (b->exp <= EXP_UNDER)) ?`
168			`COMP_Denormal : 0)`
169			`#endif DENORM_OPERAND`
170			`;`
171
172			`}`
173
174
175			`/* This function requires that st(0) is not empty */`
176			`int compare_st_data(FPU_REG const *loaded_data)`
177			`{`
178			`int f, c;`
179
180			`c = compare(loaded_data);`
181
182			`if (c & COMP_NaN)`
183			`{`
184			`EXCEPTION(EX_Invalid);`
185			`f = SW_C3 \| SW_C2 \| SW_C0;`
186			`}`
187			`else`
188			`switch (c & 7)`
189			`{`
190			`case COMP_A_lt_B:`
191			`f = SW_C0;`
192			`break;`
193			`case COMP_A_eq_B:`
194			`f = SW_C3;`
195			`break;`
196			`case COMP_A_gt_B:`
197			`f = 0;`
198			`break;`
199			`case COMP_No_Comp:`
200			`f = SW_C3 \| SW_C2 \| SW_C0;`
201			`break;`
202			`#ifdef PARANOID`
203			`default:`
204			`EXCEPTION(EX_INTERNAL\|0x121);`
205			`f = SW_C3 \| SW_C2 \| SW_C0;`
206			`break;`
207			`#endif PARANOID`
208			`}`
209			`setcc(f);`
210			`if (c & COMP_Denormal)`
211			`{`
212			`return denormal_operand();`
213			`}`
214			`return 0;`
215			`}`
216
217
218			`static int compare_st_st(int nr)`
219			`{`
220			`int f, c;`
221
222			`if ( !NOT_EMPTY(0) \|\| !NOT_EMPTY(nr) )`
223			`{`
224			`setcc(SW_C3 \| SW_C2 \| SW_C0);`
225			`/* Stack fault */`
226			`EXCEPTION(EX_StackUnder);`
227			`return !(control_word & CW_Invalid);`
228			`}`
229
230			`c = compare(&st(nr));`
231			`if (c & COMP_NaN)`
232			`{`
233			`setcc(SW_C3 \| SW_C2 \| SW_C0);`
234			`EXCEPTION(EX_Invalid);`
235			`return !(control_word & CW_Invalid);`
236			`}`
237			`else`
238			`switch (c & 7)`
239			`{`
240			`case COMP_A_lt_B:`
241			`f = SW_C0;`
242			`break;`
243			`case COMP_A_eq_B:`
244			`f = SW_C3;`
245			`break;`
246			`case COMP_A_gt_B:`
247			`f = 0;`
248			`break;`
249			`case COMP_No_Comp:`
250			`f = SW_C3 \| SW_C2 \| SW_C0;`
251			`break;`
252			`#ifdef PARANOID`
253			`default:`
254			`EXCEPTION(EX_INTERNAL\|0x122);`
255			`f = SW_C3 \| SW_C2 \| SW_C0;`
256			`break;`
257			`#endif PARANOID`
258			`}`
259			`setcc(f);`
260			`if (c & COMP_Denormal)`
261			`{`
262			`return denormal_operand();`
263			`}`
264			`return 0;`
265			`}`
266
267
268			`static int compare_u_st_st(int nr)`
269			`{`
270			`int f, c;`
271
272			`if ( !NOT_EMPTY(0) \|\| !NOT_EMPTY(nr) )`
273			`{`
274			`setcc(SW_C3 \| SW_C2 \| SW_C0);`
275			`/* Stack fault */`
276			`EXCEPTION(EX_StackUnder);`
277			`return !(control_word & CW_Invalid);`
278			`}`
279
280			`c = compare(&st(nr));`
281			`if (c & COMP_NaN)`
282			`{`
283			`setcc(SW_C3 \| SW_C2 \| SW_C0);`
284			`if (c & COMP_SNaN) /* This is the only difference between`
285			`un-ordered and ordinary comparisons */`
286			`{`
287			`EXCEPTION(EX_Invalid);`
288			`return !(control_word & CW_Invalid);`
289			`}`
290			`return 0;`
291			`}`
292			`else`
293			`switch (c & 7)`
294			`{`
295			`case COMP_A_lt_B:`
296			`f = SW_C0;`
297			`break;`
298			`case COMP_A_eq_B:`
299			`f = SW_C3;`
300			`break;`
301			`case COMP_A_gt_B:`
302			`f = 0;`
303			`break;`
304			`case COMP_No_Comp:`
305			`f = SW_C3 \| SW_C2 \| SW_C0;`
306			`break;`
307			`#ifdef PARANOID`
308			`default:`
309			`EXCEPTION(EX_INTERNAL\|0x123);`
310			`f = SW_C3 \| SW_C2 \| SW_C0;`
311			`break;`
312			`#endif PARANOID`
313			`}`
314			`setcc(f);`
315			`if (c & COMP_Denormal)`
316			`{`
317			`return denormal_operand();`
318			`}`
319			`return 0;`
320			`}`
321
322			`/---------------------------------------------------------------------------/`
323
324			`void fcom_st()`
325			`{`
326			`/* fcom st(i) */`
327			`compare_st_st(FPU_rm);`
328			`}`
329
330
331			`void fcompst()`
332			`{`
333			`/* fcomp st(i) */`
334			`if ( !compare_st_st(FPU_rm) )`
335			`pop();`
336			`}`
337
338
339			`void fcompp()`
340			`{`
341			`/* fcompp */`
342			`if (FPU_rm != 1)`
343			`{`
344			`FPU_illegal();`
345			`return;`
346			`}`
347			`if ( !compare_st_st(1) )`
348			`poppop();`
349			`}`
350
351
352			`void fucom_()`
353			`{`
354			`/* fucom st(i) */`
355			`compare_u_st_st(FPU_rm);`
356
357			`}`
358
359
360			`void fucomp()`
361			`{`
362			`/* fucomp st(i) */`
363			`if ( !compare_u_st_st(FPU_rm) )`
364			`pop();`
365			`}`
366
367
368			`void fucompp()`
369			`{`
370			`/* fucompp */`
371			`if (FPU_rm == 1)`
372			`{`
373			`if ( !compare_u_st_st(1) )`
374			`poppop();`
375			`}`
376			`else`
377			`FPU_illegal();`
378			`}`