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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [i386/] [math-emu/] [wm_shrx.S] - Blame information for rev 1767

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        .file   "wm_shrx.S"
/*---------------------------------------------------------------------------+
 |  wm_shrx.S                                                                |
 |                                                                           |
 | 64 bit right shift functions                                              |
 |                                                                           |
 | Copyright (C) 1992,1995                                                   |
 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
 |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
 |                                                                           |
 | Call from C as:                                                           |
 |   unsigned shrx(void *arg1, unsigned arg2)                                |
 | and                                                                       |
 |   unsigned shrxs(void *arg1, unsigned arg2)                               |
 |                                                                           |
 +---------------------------------------------------------------------------*/
 
#include "fpu_emu.h"
 
.text
/*---------------------------------------------------------------------------+
 |   unsigned shrx(void *arg1, unsigned arg2)                                |
 |                                                                           |
 |   Extended shift right function.                                          |
 |   Fastest for small shifts.                                               |
 |   Shifts the 64 bit quantity pointed to by the first arg (arg1)           |
 |   right by the number of bits specified by the second arg (arg2).         |
 |   Forms a 96 bit quantity from the 64 bit arg and eax:                    |
 |                [  64 bit arg ][ eax ]                                     |
 |            shift right  --------->                                        |
 |   The eax register is initialized to 0 before the shifting.               |
 |   Results returned in the 64 bit arg and eax.                             |
 +---------------------------------------------------------------------------*/
 
ENTRY(shrx)
        push    %ebp
        movl    %esp,%ebp
        pushl   %esi
        movl    PARAM2,%ecx
        movl    PARAM1,%esi
        cmpl    $32,%ecx        /* shrd only works for 0..31 bits */
        jnc     L_more_than_31
 
/* less than 32 bits */
        pushl   %ebx
        movl    (%esi),%ebx     /* lsl */
        movl    4(%esi),%edx    /* msl */
        xorl    %eax,%eax       /* extension */
        shrd    %cl,%ebx,%eax
        shrd    %cl,%edx,%ebx
        shr     %cl,%edx
        movl    %ebx,(%esi)
        movl    %edx,4(%esi)
        popl    %ebx
        popl    %esi
        leave
        ret
 
L_more_than_31:
        cmpl    $64,%ecx
        jnc     L_more_than_63
 
        subb    $32,%cl
        movl    (%esi),%eax     /* lsl */
        movl    4(%esi),%edx    /* msl */
        shrd    %cl,%edx,%eax
        shr     %cl,%edx
        movl    %edx,(%esi)
        movl    $0,4(%esi)
        popl    %esi
        leave
        ret
 
L_more_than_63:
        cmpl    $96,%ecx
        jnc     L_more_than_95
 
        subb    $64,%cl
        movl    4(%esi),%eax    /* msl */
        shr     %cl,%eax
        xorl    %edx,%edx
        movl    %edx,(%esi)
        movl    %edx,4(%esi)
        popl    %esi
        leave
        ret
 
L_more_than_95:
        xorl    %eax,%eax
        movl    %eax,(%esi)
        movl    %eax,4(%esi)
        popl    %esi
        leave
        ret
 
 
/*---------------------------------------------------------------------------+
 |   unsigned shrxs(void *arg1, unsigned arg2)                               |
 |                                                                           |
 |   Extended shift right function (optimized for small floating point       |
 |   integers).                                                              |
 |   Shifts the 64 bit quantity pointed to by the first arg (arg1)           |
 |   right by the number of bits specified by the second arg (arg2).         |
 |   Forms a 96 bit quantity from the 64 bit arg and eax:                    |
 |                [  64 bit arg ][ eax ]                                     |
 |            shift right  --------->                                        |
 |   The eax register is initialized to 0 before the shifting.               |
 |   The lower 8 bits of eax are lost and replaced by a flag which is        |
 |   set (to 0x01) if any bit, apart from the first one, is set in the       |
 |   part which has been shifted out of the arg.                             |
 |   Results returned in the 64 bit arg and eax.                             |
 +---------------------------------------------------------------------------*/
ENTRY(shrxs)
        push    %ebp
        movl    %esp,%ebp
        pushl   %esi
        pushl   %ebx
        movl    PARAM2,%ecx
        movl    PARAM1,%esi
        cmpl    $64,%ecx        /* shrd only works for 0..31 bits */
        jnc     Ls_more_than_63
 
        cmpl    $32,%ecx        /* shrd only works for 0..31 bits */
        jc      Ls_less_than_32
 
/* We got here without jumps by assuming that the most common requirement
   is for small integers */
/* Shift by [32..63] bits */
        subb    $32,%cl
        movl    (%esi),%eax     /* lsl */
        movl    4(%esi),%edx    /* msl */
        xorl    %ebx,%ebx
        shrd    %cl,%eax,%ebx
        shrd    %cl,%edx,%eax
        shr     %cl,%edx
        orl     %ebx,%ebx               /* test these 32 bits */
        setne   %bl
        test    $0x7fffffff,%eax        /* and 31 bits here */
        setne   %bh
        orw     %bx,%bx                 /* Any of the 63 bit set ? */
        setne   %al
        movl    %edx,(%esi)
        movl    $0,4(%esi)
        popl    %ebx
        popl    %esi
        leave
        ret
 
/* Shift by [0..31] bits */
Ls_less_than_32:
        movl    (%esi),%ebx     /* lsl */
        movl    4(%esi),%edx    /* msl */
        xorl    %eax,%eax       /* extension */
        shrd    %cl,%ebx,%eax
        shrd    %cl,%edx,%ebx
        shr     %cl,%edx
        test    $0x7fffffff,%eax        /* only need to look at eax here */
        setne   %al
        movl    %ebx,(%esi)
        movl    %edx,4(%esi)
        popl    %ebx
        popl    %esi
        leave
        ret
 
/* Shift by [64..95] bits */
Ls_more_than_63:
        cmpl    $96,%ecx
        jnc     Ls_more_than_95
 
        subb    $64,%cl
        movl    (%esi),%ebx     /* lsl */
        movl    4(%esi),%eax    /* msl */
        xorl    %edx,%edx       /* extension */
        shrd    %cl,%ebx,%edx
        shrd    %cl,%eax,%ebx
        shr     %cl,%eax
        orl     %ebx,%edx
        setne   %bl
        test    $0x7fffffff,%eax        /* only need to look at eax here */
        setne   %bh
        orw     %bx,%bx
        setne   %al
        xorl    %edx,%edx
        movl    %edx,(%esi)     /* set to zero */
        movl    %edx,4(%esi)    /* set to zero */
        popl    %ebx
        popl    %esi
        leave
        ret
 
Ls_more_than_95:
/* Shift by [96..inf) bits */
        xorl    %eax,%eax
        movl    (%esi),%ebx
        orl     4(%esi),%ebx
        setne   %al
        xorl    %ebx,%ebx
        movl    %ebx,(%esi)
        movl    %ebx,4(%esi)
        popl    %ebx
        popl    %esi
        leave
        ret

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[/] [or1k/] [trunk/] [uclinux/] [uClinux-2.0.x/] [arch/] [i386/] [math-emu/] [wm_shrx.S] - Blame information for rev 1767

Line No.	Rev	Author	Line
1	199	simons	`.file "wm_shrx.S"`
2			`/*---------------------------------------------------------------------------+`
3			`\| wm_shrx.S \|`
4			`\| \|`
5			`\| 64 bit right shift functions \|`
6			`\| \|`
7			`\| Copyright (C) 1992,1995 \|`
8			`\| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, \|`
9			`\| Australia. E-mail billm@jacobi.maths.monash.edu.au \|`
10			`\| \|`
11			`\| Call from C as: \|`
12			`\| unsigned shrx(void *arg1, unsigned arg2) \|`
13			`\| and \|`
14			`\| unsigned shrxs(void *arg1, unsigned arg2) \|`
15			`\| \|`
16			`+---------------------------------------------------------------------------*/`
17
18			`#include "fpu_emu.h"`
19
20			`.text`
21			`/*---------------------------------------------------------------------------+`
22			`\| unsigned shrx(void *arg1, unsigned arg2) \|`
23			`\| \|`
24			`\| Extended shift right function. \|`
25			`\| Fastest for small shifts. \|`
26			`\| Shifts the 64 bit quantity pointed to by the first arg (arg1) \|`
27			`\| right by the number of bits specified by the second arg (arg2). \|`
28			`\| Forms a 96 bit quantity from the 64 bit arg and eax: \|`
29			`\| [ 64 bit arg ][ eax ] \|`
30			`\| shift right ---------> \|`
31			`\| The eax register is initialized to 0 before the shifting. \|`
32			`\| Results returned in the 64 bit arg and eax. \|`
33			`+---------------------------------------------------------------------------*/`
34
35			`ENTRY(shrx)`
36			`push %ebp`
37			`movl %esp,%ebp`
38			`pushl %esi`
39			`movl PARAM2,%ecx`
40			`movl PARAM1,%esi`
41			`cmpl $32,%ecx /* shrd only works for 0..31 bits */`
42			`jnc L_more_than_31`
43
44			`/* less than 32 bits */`
45			`pushl %ebx`
46			`movl (%esi),%ebx /* lsl */`
47			`movl 4(%esi),%edx /* msl */`
48			`xorl %eax,%eax /* extension */`
49			`shrd %cl,%ebx,%eax`
50			`shrd %cl,%edx,%ebx`
51			`shr %cl,%edx`
52			`movl %ebx,(%esi)`
53			`movl %edx,4(%esi)`
54			`popl %ebx`
55			`popl %esi`
56			`leave`
57			`ret`
58
59			`L_more_than_31:`
60			`cmpl $64,%ecx`
61			`jnc L_more_than_63`
62
63			`subb $32,%cl`
64			`movl (%esi),%eax /* lsl */`
65			`movl 4(%esi),%edx /* msl */`
66			`shrd %cl,%edx,%eax`
67			`shr %cl,%edx`
68			`movl %edx,(%esi)`
69			`movl $0,4(%esi)`
70			`popl %esi`
71			`leave`
72			`ret`
73
74			`L_more_than_63:`
75			`cmpl $96,%ecx`
76			`jnc L_more_than_95`
77
78			`subb $64,%cl`
79			`movl 4(%esi),%eax /* msl */`
80			`shr %cl,%eax`
81			`xorl %edx,%edx`
82			`movl %edx,(%esi)`
83			`movl %edx,4(%esi)`
84			`popl %esi`
85			`leave`
86			`ret`
87
88			`L_more_than_95:`
89			`xorl %eax,%eax`
90			`movl %eax,(%esi)`
91			`movl %eax,4(%esi)`
92			`popl %esi`
93			`leave`
94			`ret`
95
96
97			`/*---------------------------------------------------------------------------+`
98			`\| unsigned shrxs(void *arg1, unsigned arg2) \|`
99			`\| \|`
100			`\| Extended shift right function (optimized for small floating point \|`
101			`\| integers). \|`
102			`\| Shifts the 64 bit quantity pointed to by the first arg (arg1) \|`
103			`\| right by the number of bits specified by the second arg (arg2). \|`
104			`\| Forms a 96 bit quantity from the 64 bit arg and eax: \|`
105			`\| [ 64 bit arg ][ eax ] \|`
106			`\| shift right ---------> \|`
107			`\| The eax register is initialized to 0 before the shifting. \|`
108			`\| The lower 8 bits of eax are lost and replaced by a flag which is \|`
109			`\| set (to 0x01) if any bit, apart from the first one, is set in the \|`
110			`\| part which has been shifted out of the arg. \|`
111			`\| Results returned in the 64 bit arg and eax. \|`
112			`+---------------------------------------------------------------------------*/`
113			`ENTRY(shrxs)`
114			`push %ebp`
115			`movl %esp,%ebp`
116			`pushl %esi`
117			`pushl %ebx`
118			`movl PARAM2,%ecx`
119			`movl PARAM1,%esi`
120			`cmpl $64,%ecx /* shrd only works for 0..31 bits */`
121			`jnc Ls_more_than_63`
122
123			`cmpl $32,%ecx /* shrd only works for 0..31 bits */`
124			`jc Ls_less_than_32`
125
126			`/* We got here without jumps by assuming that the most common requirement`
127			`is for small integers */`
128			`/* Shift by [32..63] bits */`
129			`subb $32,%cl`
130			`movl (%esi),%eax /* lsl */`
131			`movl 4(%esi),%edx /* msl */`
132			`xorl %ebx,%ebx`
133			`shrd %cl,%eax,%ebx`
134			`shrd %cl,%edx,%eax`
135			`shr %cl,%edx`
136			`orl %ebx,%ebx /* test these 32 bits */`
137			`setne %bl`
138			`test $0x7fffffff,%eax /* and 31 bits here */`
139			`setne %bh`
140			`orw %bx,%bx /* Any of the 63 bit set ? */`
141			`setne %al`
142			`movl %edx,(%esi)`
143			`movl $0,4(%esi)`
144			`popl %ebx`
145			`popl %esi`
146			`leave`
147			`ret`
148
149			`/* Shift by [0..31] bits */`
150			`Ls_less_than_32:`
151			`movl (%esi),%ebx /* lsl */`
152			`movl 4(%esi),%edx /* msl */`
153			`xorl %eax,%eax /* extension */`
154			`shrd %cl,%ebx,%eax`
155			`shrd %cl,%edx,%ebx`
156			`shr %cl,%edx`
157			`test $0x7fffffff,%eax /* only need to look at eax here */`
158			`setne %al`
159			`movl %ebx,(%esi)`
160			`movl %edx,4(%esi)`
161			`popl %ebx`
162			`popl %esi`
163			`leave`
164			`ret`
165
166			`/* Shift by [64..95] bits */`
167			`Ls_more_than_63:`
168			`cmpl $96,%ecx`
169			`jnc Ls_more_than_95`
170
171			`subb $64,%cl`
172			`movl (%esi),%ebx /* lsl */`
173			`movl 4(%esi),%eax /* msl */`
174			`xorl %edx,%edx /* extension */`
175			`shrd %cl,%ebx,%edx`
176			`shrd %cl,%eax,%ebx`
177			`shr %cl,%eax`
178			`orl %ebx,%edx`
179			`setne %bl`
180			`test $0x7fffffff,%eax /* only need to look at eax here */`
181			`setne %bh`
182			`orw %bx,%bx`
183			`setne %al`
184			`xorl %edx,%edx`
185			`movl %edx,(%esi) /* set to zero */`
186			`movl %edx,4(%esi) /* set to zero */`
187			`popl %ebx`
188			`popl %esi`
189			`leave`
190			`ret`
191
192			`Ls_more_than_95:`
193			`/* Shift by [96..inf) bits */`
194			`xorl %eax,%eax`
195			`movl (%esi),%ebx`
196			`orl 4(%esi),%ebx`
197			`setne %al`
198			`xorl %ebx,%ebx`
199			`movl %ebx,(%esi)`
200			`movl %ebx,4(%esi)`
201			`popl %ebx`
202			`popl %esi`
203			`leave`
204			`ret`