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/*---------------------------------------------------------------------------+
 |  reg_norm.S                                                               |
 |                                                                           |
 | Copyright (C) 1992,1993,1994,1995                                         |
 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
 |                       Australia.  E-mail billm@jacobi.maths.monash.edu.au |
 |                                                                           |
 | Normalize the value in a FPU_REG.                                         |
 |                                                                           |
 | Call from C as:                                                           |
 |   void normalize(FPU_REG *n)                                              |
 |                                                                           |
 |   void normalize_nuo(FPU_REG *n)                                          |
 |                                                                           |
 +---------------------------------------------------------------------------*/
 
#include "fpu_emu.h"
 
 
.text
ENTRY(normalize)
        pushl   %ebp
        movl    %esp,%ebp
        pushl   %ebx
 
        movl    PARAM1,%ebx
 
#ifdef PARANOID
        cmpb    TW_Valid,TAG(%ebx)
        je      L_ok
 
        pushl   $0x220
        call    SYMBOL_NAME(exception)
        addl    $4,%esp
 
L_ok:
#endif PARANOID
 
        movl    SIGH(%ebx),%edx
        movl    SIGL(%ebx),%eax
 
        orl     %edx,%edx       /* ms bits */
        js      L_done          /* Already normalized */
        jnz     L_shift_1       /* Shift left 1 - 31 bits */
 
        orl     %eax,%eax
        jz      L_zero          /* The contents are zero */
 
        movl    %eax,%edx
        xorl    %eax,%eax
        subl    $32,EXP(%ebx)   /* This can cause an underflow */
 
/* We need to shift left by 1 - 31 bits */
L_shift_1:
        bsrl    %edx,%ecx       /* get the required shift in %ecx */
        subl    $31,%ecx
        negl    %ecx
        shld    %cl,%eax,%edx
        shl     %cl,%eax
        subl    %ecx,EXP(%ebx)  /* This can cause an underflow */
 
        movl    %edx,SIGH(%ebx)
        movl    %eax,SIGL(%ebx)
 
L_done:
        cmpl    EXP_OVER,EXP(%ebx)
        jge     L_overflow
 
        cmpl    EXP_UNDER,EXP(%ebx)
        jle     L_underflow
 
L_exit:
        popl    %ebx
        leave
        ret
 
 
L_zero:
        movl    EXP_UNDER,EXP(%ebx)
        movb    TW_Zero,TAG(%ebx)
        jmp     L_exit
 
L_underflow:
        push    %ebx
        call    SYMBOL_NAME(arith_underflow)
        pop     %ebx
        jmp     L_exit
 
L_overflow:
        push    %ebx
        call    SYMBOL_NAME(arith_overflow)
        pop     %ebx
        jmp     L_exit
 
 
 
/* Normalise without reporting underflow or overflow */
ENTRY(normalize_nuo)
        pushl   %ebp
        movl    %esp,%ebp
        pushl   %ebx
 
        movl    PARAM1,%ebx
 
#ifdef PARANOID
        cmpb    TW_Valid,TAG(%ebx)
        je      L_ok_nuo
 
        pushl   $0x221
        call    SYMBOL_NAME(exception)
        addl    $4,%esp
 
L_ok_nuo:
#endif PARANOID
 
        movl    SIGH(%ebx),%edx
        movl    SIGL(%ebx),%eax
 
        orl     %edx,%edx       /* ms bits */
        js      L_exit          /* Already normalized */
        jnz     L_nuo_shift_1   /* Shift left 1 - 31 bits */
 
        orl     %eax,%eax
        jz      L_zero          /* The contents are zero */
 
        movl    %eax,%edx
        xorl    %eax,%eax
        subl    $32,EXP(%ebx)   /* This can cause an underflow */
 
/* We need to shift left by 1 - 31 bits */
L_nuo_shift_1:
        bsrl    %edx,%ecx       /* get the required shift in %ecx */
        subl    $31,%ecx
        negl    %ecx
        shld    %cl,%eax,%edx
        shl     %cl,%eax
        subl    %ecx,EXP(%ebx)  /* This can cause an underflow */
 
        movl    %edx,SIGH(%ebx)
        movl    %eax,SIGL(%ebx)
        jmp     L_exit
 
 

Line No.	Rev	Author	Line
1	1623	jcastillo	`/*---------------------------------------------------------------------------+`
2			`\| reg_norm.S \|`
3			`\| \|`
4			`\| Copyright (C) 1992,1993,1994,1995 \|`
5			`\| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, \|`
6			`\| Australia. E-mail billm@jacobi.maths.monash.edu.au \|`
7			`\| \|`
8			`\| Normalize the value in a FPU_REG. \|`
9			`\| \|`
10			`\| Call from C as: \|`
11			`\| void normalize(FPU_REG *n) \|`
12			`\| \|`
13			`\| void normalize_nuo(FPU_REG *n) \|`
14			`\| \|`
15			`+---------------------------------------------------------------------------*/`
16
17			`#include "fpu_emu.h"`
18
19
20			`.text`
21			`ENTRY(normalize)`
22			`pushl %ebp`
23			`movl %esp,%ebp`
24			`pushl %ebx`
25
26			`movl PARAM1,%ebx`
27
28			`#ifdef PARANOID`
29			`cmpb TW_Valid,TAG(%ebx)`
30			`je L_ok`
31
32			`pushl $0x220`
33			`call SYMBOL_NAME(exception)`
34			`addl $4,%esp`
35
36			`L_ok:`
37			`#endif PARANOID`
38
39			`movl SIGH(%ebx),%edx`
40			`movl SIGL(%ebx),%eax`
41
42			`orl %edx,%edx /* ms bits */`
43			`js L_done /* Already normalized */`
44			`jnz L_shift_1 /* Shift left 1 - 31 bits */`
45
46			`orl %eax,%eax`
47			`jz L_zero /* The contents are zero */`
48
49			`movl %eax,%edx`
50			`xorl %eax,%eax`
51			`subl $32,EXP(%ebx) /* This can cause an underflow */`
52
53			`/* We need to shift left by 1 - 31 bits */`
54			`L_shift_1:`
55			`bsrl %edx,%ecx /* get the required shift in %ecx */`
56			`subl $31,%ecx`
57			`negl %ecx`
58			`shld %cl,%eax,%edx`
59			`shl %cl,%eax`
60			`subl %ecx,EXP(%ebx) /* This can cause an underflow */`
61
62			`movl %edx,SIGH(%ebx)`
63			`movl %eax,SIGL(%ebx)`
64
65			`L_done:`
66			`cmpl EXP_OVER,EXP(%ebx)`
67			`jge L_overflow`
68
69			`cmpl EXP_UNDER,EXP(%ebx)`
70			`jle L_underflow`
71
72			`L_exit:`
73			`popl %ebx`
74			`leave`
75			`ret`
76
77
78			`L_zero:`
79			`movl EXP_UNDER,EXP(%ebx)`
80			`movb TW_Zero,TAG(%ebx)`
81			`jmp L_exit`
82
83			`L_underflow:`
84			`push %ebx`
85			`call SYMBOL_NAME(arith_underflow)`
86			`pop %ebx`
87			`jmp L_exit`
88
89			`L_overflow:`
90			`push %ebx`
91			`call SYMBOL_NAME(arith_overflow)`
92			`pop %ebx`
93			`jmp L_exit`
94
95
96
97			`/* Normalise without reporting underflow or overflow */`
98			`ENTRY(normalize_nuo)`
99			`pushl %ebp`
100			`movl %esp,%ebp`
101			`pushl %ebx`
102
103			`movl PARAM1,%ebx`
104
105			`#ifdef PARANOID`
106			`cmpb TW_Valid,TAG(%ebx)`
107			`je L_ok_nuo`
108
109			`pushl $0x221`
110			`call SYMBOL_NAME(exception)`
111			`addl $4,%esp`
112
113			`L_ok_nuo:`
114			`#endif PARANOID`
115
116			`movl SIGH(%ebx),%edx`
117			`movl SIGL(%ebx),%eax`
118
119			`orl %edx,%edx /* ms bits */`
120			`js L_exit /* Already normalized */`
121			`jnz L_nuo_shift_1 /* Shift left 1 - 31 bits */`
122
123			`orl %eax,%eax`
124			`jz L_zero /* The contents are zero */`
125
126			`movl %eax,%edx`
127			`xorl %eax,%eax`
128			`subl $32,EXP(%ebx) /* This can cause an underflow */`
129
130			`/* We need to shift left by 1 - 31 bits */`
131			`L_nuo_shift_1:`
132			`bsrl %edx,%ecx /* get the required shift in %ecx */`
133			`subl $31,%ecx`
134			`negl %ecx`
135			`shld %cl,%eax,%edx`
136			`shl %cl,%eax`
137			`subl %ecx,EXP(%ebx) /* This can cause an underflow */`
138
139			`movl %edx,SIGH(%ebx)`
140			`movl %eax,SIGL(%ebx)`
141			`jmp L_exit`
142
143

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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [arch/] [i386/] [math-emu/] [reg_norm.S] - Blame information for rev 1777