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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [arc/] [lib1funcs.asm] - Blame information for rev 378

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; libgcc routines for ARC cpu.
 
/* Copyright (C) 1995, 1997,2004, 2009 Free Software Foundation, Inc.
 
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
 
This file is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.
 
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
 
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
.  */
 
#ifdef  L_mulsi3
        .section .text
        .align 4
 
#ifdef __base__
        .cpu base
        .global ___mulsi3
___mulsi3:
 
/* This the simple version.
 
  while (a)
    {
      if (a & 1)
        r += b;
      a >>= 1;
      b <<= 1;
    }
*/
        mov r2,0                ; Accumulate result here.
.Lloop:
        sub.f 0,r0,0            ; while (a)
        nop
        beq.nd .Ldone
        and.f 0,r0,1            ; if (a & 1)
        add.nz r2,r2,r1         ; r += b
        lsr r0,r0               ; a >>= 1
        b.d .Lloop
        lsl r1,r1               ; b <<= 1
.Ldone:
        j.d blink
        mov r0,r2
#endif
 
#endif /* L_mulsi3 */
 
#ifdef  L_umulsidi3
        .section .text
        .align 4
 
#ifdef __base__
        .cpu base
        .global ___umulsidi3
___umulsidi3:
 
/* This the simple version.
 
  while (a)
    {
      if (a & 1)
        r += b;
      a >>= 1;
      b <<= 1;
    }
*/
        mov r2,0                ; Top part of b.
        mov r3,0                ; Accumulate result here.
        mov r4,0
.Lloop:
        sub.f 0,r0,0            ; while (a)
        nop
        beq.nd .Ldone
        and.f 0,r0,1            ; if (a & 1)
        sub.f 0,r0,0
        nop
        beq .Ldontadd
        add.f r4,r4,r1          ; r += b
        adc   r3,r3,r2
.Ldontadd:
        lsr r0,r0               ; a >>= 1
        lsl.f r1,r1             ; b <<= 1
        b.d .Lloop
        rlc r2,r2
.Ldone:
#ifdef __big_endian__
        mov r1,r4
        j.d blink
        mov r0,r3
#else
        mov r0,r4
        j.d blink
        mov r1,r3
#endif
#endif
 
#endif /* L_umulsidi3 */
 
#ifdef L_divmod_tools
 
; Utilities used by all routines.
 
        .section .text
        .align 4
 
; inputs: r0 = numerator, r1 = denominator
; outputs: positive r0/r1,
;          r6.bit1 = sign of numerator, r6.bit0 = sign of result
 
        .global ___divnorm
___divnorm:
        mov r6,0                ; keep sign in r6
        sub.f 0,r0,0            ; is numerator -ve?
        sub.lt r0,0,r0          ; negate numerator
        mov.lt r6,3             ; sign is -ve
        sub.f 0,r1,0            ; is denominator -ve?
        sub.lt r1,0,r1          ; negate denominator
        xor.lt r6,r6,1          ; toggle sign
        j.nd blink
 
/*
unsigned long
udivmodsi4(int modwanted, unsigned long num, unsigned long den)
{
  unsigned long bit = 1;
  unsigned long res = 0;
 
  while (den < num && bit && !(den & (1L<<31)))
    {
      den <<=1;
      bit <<=1;
    }
  while (bit)
    {
      if (num >= den)
        {
          num -= den;
          res |= bit;
        }
      bit >>=1;
      den >>=1;
    }
  if (modwanted) return num;
  return res;
}
*/
 
; inputs: r0 = numerator, r1 = denominator
; outputs: r0 = quotient, r1 = remainder, r2/r3 trashed
 
        .global ___udivmodsi4
___udivmodsi4:
        mov r2,1                ; bit = 1
        mov r3,0                ; res = 0
.Lloop1:
        sub.f 0,r1,r0           ; while (den < num
        nop
        bnc.nd .Lloop2
        sub.f 0,r2,0            ; && bit
        nop
        bz.nd .Lloop2
        lsl.f 0,r1              ; && !(den & (1<<31))
        nop
        bc.nd .Lloop2
        lsl r1,r1               ; den <<= 1
        b.d .Lloop1
        lsl r2,r2               ; bit <<= 1
.Lloop2:
        sub.f 0,r2,0            ; while (bit)
        nop
        bz.nd .Ldivmodend
        sub.f 0,r0,r1           ; if (num >= den)
        nop
        bc.nd .Lshiftdown
        sub r0,r0,r1            ; num -= den
        or r3,r3,r2             ; res |= bit
.Lshiftdown:
        lsr r2,r2               ; bit >>= 1
        b.d .Lloop2
        lsr r1,r1               ; den >>= 1
.Ldivmodend:
        mov r1,r0               ; r1 = mod
        j.d blink
        mov r0,r3               ; r0 = res
 
#endif
 
#ifdef  L_udivsi3
        .section .text
        .align 4
 
#ifdef __base__
        .cpu base
        .global ___udivsi3
___udivsi3:
        mov r7,blink
        bl.nd ___udivmodsi4
        j.nd r7
#endif
 
#endif /* L_udivsi3 */
 
#ifdef  L_divsi3
        .section .text
        .align 4
 
#ifdef __base__
        .cpu base
        .global ___divsi3
___divsi3:
        mov r7,blink
        bl.nd ___divnorm
        bl.nd ___udivmodsi4
        and.f 0,r6,1
        sub.nz r0,0,r0          ; cannot go in delay slot, has limm value
        j.nd r7
#endif
 
#endif /* L_divsi3 */
 
#ifdef  L_umodsi3
        .section .text
        .align 4
 
#ifdef __base__
        .cpu base
        .global ___umodsi3
___umodsi3:
        mov r7,blink
        bl.nd ___udivmodsi4
        j.d r7
        mov r0,r1
#endif
 
#endif /* L_umodsi3 */
 
#ifdef  L_modsi3
        .section .text
        .align 4
 
#ifdef __base__
        .cpu base
        .global ___modsi3
___modsi3:
        mov r7,blink
        bl.nd ___divnorm
        bl.nd ___udivmodsi4
        and.f 0,r6,2
        sub.nz r1,0,r1
        j.d r7
        mov r0,r1
#endif
 
#endif /* L_modsi3 */

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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [config/] [arc/] [lib1funcs.asm] - Blame information for rev 378

Line No.	Rev	Author	Line
1	282	jeremybenn	`; libgcc routines for ARC cpu.`
2
3			`/* Copyright (C) 1995, 1997,2004, 2009 Free Software Foundation, Inc.`
4
5			`This file is free software; you can redistribute it and/or modify it`
6			`under the terms of the GNU General Public License as published by the`
7			`Free Software Foundation; either version 3, or (at your option) any`
8			`later version.`
9
10			`This file is distributed in the hope that it will be useful, but`
11			`WITHOUT ANY WARRANTY; without even the implied warranty of`
12			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
13			`General Public License for more details.`
14
15			`Under Section 7 of GPL version 3, you are granted additional`
16			`permissions described in the GCC Runtime Library Exception, version`
17			`3.1, as published by the Free Software Foundation.`
18
19			`You should have received a copy of the GNU General Public License and`
20			`a copy of the GCC Runtime Library Exception along with this program;`
21			`see the files COPYING3 and COPYING.RUNTIME respectively. If not, see`
22			`. */`
23
24			`#ifdef L_mulsi3`
25			`.section .text`
26			`.align 4`
27
28			`#ifdef __base__`
29			`.cpu base`
30			`.global ___mulsi3`
31			`___mulsi3:`
32
33			`/* This the simple version.`
34
35			`while (a)`
36			`{`
37			`if (a & 1)`
38			`r += b;`
39			`a >>= 1;`
40			`b <<= 1;`
41			`}`
42			`*/`
43			`mov r2,0 ; Accumulate result here.`
44			`.Lloop:`
45			`sub.f 0,r0,0 ; while (a)`
46			`nop`
47			`beq.nd .Ldone`
48			`and.f 0,r0,1 ; if (a & 1)`
49			`add.nz r2,r2,r1 ; r += b`
50			`lsr r0,r0 ; a >>= 1`
51			`b.d .Lloop`
52			`lsl r1,r1 ; b <<= 1`
53			`.Ldone:`
54			`j.d blink`
55			`mov r0,r2`
56			`#endif`
57
58			`#endif /* L_mulsi3 */`
59
60			`#ifdef L_umulsidi3`
61			`.section .text`
62			`.align 4`
63
64			`#ifdef __base__`
65			`.cpu base`
66			`.global ___umulsidi3`
67			`___umulsidi3:`
68
69			`/* This the simple version.`
70
71			`while (a)`
72			`{`
73			`if (a & 1)`
74			`r += b;`
75			`a >>= 1;`
76			`b <<= 1;`
77			`}`
78			`*/`
79			`mov r2,0 ; Top part of b.`
80			`mov r3,0 ; Accumulate result here.`
81			`mov r4,0`
82			`.Lloop:`
83			`sub.f 0,r0,0 ; while (a)`
84			`nop`
85			`beq.nd .Ldone`
86			`and.f 0,r0,1 ; if (a & 1)`
87			`sub.f 0,r0,0`
88			`nop`
89			`beq .Ldontadd`
90			`add.f r4,r4,r1 ; r += b`
91			`adc r3,r3,r2`
92			`.Ldontadd:`
93			`lsr r0,r0 ; a >>= 1`
94			`lsl.f r1,r1 ; b <<= 1`
95			`b.d .Lloop`
96			`rlc r2,r2`
97			`.Ldone:`
98			`#ifdef __big_endian__`
99			`mov r1,r4`
100			`j.d blink`
101			`mov r0,r3`
102			`#else`
103			`mov r0,r4`
104			`j.d blink`
105			`mov r1,r3`
106			`#endif`
107			`#endif`
108
109			`#endif /* L_umulsidi3 */`
110
111			`#ifdef L_divmod_tools`
112
113			`; Utilities used by all routines.`
114
115			`.section .text`
116			`.align 4`
117
118			`; inputs: r0 = numerator, r1 = denominator`
119			`; outputs: positive r0/r1,`
120			`; r6.bit1 = sign of numerator, r6.bit0 = sign of result`
121
122			`.global ___divnorm`
123			`___divnorm:`
124			`mov r6,0 ; keep sign in r6`
125			`sub.f 0,r0,0 ; is numerator -ve?`
126			`sub.lt r0,0,r0 ; negate numerator`
127			`mov.lt r6,3 ; sign is -ve`
128			`sub.f 0,r1,0 ; is denominator -ve?`
129			`sub.lt r1,0,r1 ; negate denominator`
130			`xor.lt r6,r6,1 ; toggle sign`
131			`j.nd blink`
132
133			`/*`
134			`unsigned long`
135			`udivmodsi4(int modwanted, unsigned long num, unsigned long den)`
136			`{`
137			`unsigned long bit = 1;`
138			`unsigned long res = 0;`
139
140			`while (den < num && bit && !(den & (1L<<31)))`
141			`{`
142			`den <<=1;`
143			`bit <<=1;`
144			`}`
145			`while (bit)`
146			`{`
147			`if (num >= den)`
148			`{`
149			`num -= den;`
150			`res \|= bit;`
151			`}`
152			`bit >>=1;`
153			`den >>=1;`
154			`}`
155			`if (modwanted) return num;`
156			`return res;`
157			`}`
158			`*/`
159
160			`; inputs: r0 = numerator, r1 = denominator`
161			`; outputs: r0 = quotient, r1 = remainder, r2/r3 trashed`
162
163			`.global ___udivmodsi4`
164			`___udivmodsi4:`
165			`mov r2,1 ; bit = 1`
166			`mov r3,0 ; res = 0`
167			`.Lloop1:`
168			`sub.f 0,r1,r0 ; while (den < num`
169			`nop`
170			`bnc.nd .Lloop2`
171			`sub.f 0,r2,0 ; && bit`
172			`nop`
173			`bz.nd .Lloop2`
174			`lsl.f 0,r1 ; && !(den & (1<<31))`
175			`nop`
176			`bc.nd .Lloop2`
177			`lsl r1,r1 ; den <<= 1`
178			`b.d .Lloop1`
179			`lsl r2,r2 ; bit <<= 1`
180			`.Lloop2:`
181			`sub.f 0,r2,0 ; while (bit)`
182			`nop`
183			`bz.nd .Ldivmodend`
184			`sub.f 0,r0,r1 ; if (num >= den)`
185			`nop`
186			`bc.nd .Lshiftdown`
187			`sub r0,r0,r1 ; num -= den`
188			`or r3,r3,r2 ; res \|= bit`
189			`.Lshiftdown:`
190			`lsr r2,r2 ; bit >>= 1`
191			`b.d .Lloop2`
192			`lsr r1,r1 ; den >>= 1`
193			`.Ldivmodend:`
194			`mov r1,r0 ; r1 = mod`
195			`j.d blink`
196			`mov r0,r3 ; r0 = res`
197
198			`#endif`
199
200			`#ifdef L_udivsi3`
201			`.section .text`
202			`.align 4`
203
204			`#ifdef __base__`
205			`.cpu base`
206			`.global ___udivsi3`
207			`___udivsi3:`
208			`mov r7,blink`
209			`bl.nd ___udivmodsi4`
210			`j.nd r7`
211			`#endif`
212
213			`#endif /* L_udivsi3 */`
214
215			`#ifdef L_divsi3`
216			`.section .text`
217			`.align 4`
218
219			`#ifdef __base__`
220			`.cpu base`
221			`.global ___divsi3`
222			`___divsi3:`
223			`mov r7,blink`
224			`bl.nd ___divnorm`
225			`bl.nd ___udivmodsi4`
226			`and.f 0,r6,1`
227			`sub.nz r0,0,r0 ; cannot go in delay slot, has limm value`
228			`j.nd r7`
229			`#endif`
230
231			`#endif /* L_divsi3 */`
232
233			`#ifdef L_umodsi3`
234			`.section .text`
235			`.align 4`
236
237			`#ifdef __base__`
238			`.cpu base`
239			`.global ___umodsi3`
240			`___umodsi3:`
241			`mov r7,blink`
242			`bl.nd ___udivmodsi4`
243			`j.d r7`
244			`mov r0,r1`
245			`#endif`
246
247			`#endif /* L_umodsi3 */`
248
249			`#ifdef L_modsi3`
250			`.section .text`
251			`.align 4`
252
253			`#ifdef __base__`
254			`.cpu base`
255			`.global ___modsi3`
256			`___modsi3:`
257			`mov r7,blink`
258			`bl.nd ___divnorm`
259			`bl.nd ___udivmodsi4`
260			`and.f 0,r6,2`
261			`sub.nz r1,0,r1`
262			`j.d r7`
263			`mov r0,r1`
264			`#endif`
265
266			`#endif /* L_modsi3 */`