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1.1 root 1: /* Ksqrtf.s 1.3 86/01/05 */
2:
3: #include "../tahoe/SYS.h"
4:
5: .text
6: ENTRY(Ksqrtf, 0)
7: subl3 $76,fp,sp
8: tstl 4(fp) # if (arg <= 0.) {
9: jgtr L18
10: jgeq L19 # if (arg < 0.)
11: L19: clrl r1
12: clrl r0
13: ret # return(0.);}
14: L18:
15: pushl 20(fp) # hfs
16: subl3 $72,fp,-(sp)
17: pushl 8(fp)
18: pushl 4(fp)
19: callf $20,_Kfrexpf
20: clrl -60+4(fp)
21: movl r0,-60(fp) # x = frexp(arg,&exp);
22: jbr L20
23: L2000001:
24: pushl 20(fp) # hfs
25: ldd two
26: pushd
27: ldd -60(fp)
28: pushd
29: callf $24,_Kmuld # x * 2
30: ldd r0
31: std -60(fp) # x *= 2;
32: decl -72(fp) # exp--;}
33: L20: cmpd2 -60(fp),half # while(x < 0.5){
34: jlss L2000001
35: bitl $1,-72(fp) # if(exp & 1) {
36: jeql L24
37: pushl 20(fp) # hfs
38: ldd two
39: pushd
40: ldd -60(fp)
41: pushd
42: callf $24,_Kmuld # x * 2
43: ldd r0
44: std -60(fp) # x *= 2;
45: decl -72(fp) # exp--;}
46: L24: pushl 20(fp) # hfs
47: ldd -60(fp)
48: pushd
49: ldd one
50: pushd
51: callf $24,_Kaddd # (1.0+x)
52: pushl 20(fp) # hfs
53: ldd r0
54: pushd
55: ldd half
56: pushd
57: callf $24,_Kmuld
58: ldd r0
59: std -68(fp) # temp=0.5*(1.0+x);
60: jbr L28
61: L2000003:
62: pushl 20(fp) # hfs
63: ldd big
64: pushd
65: ldd -68(fp)
66: pushd
67: callf $24,_Kmuld # temp*(1L<<30)
68: ldd r0
69: std -68(fp) # temp *=(1L<<30);
70: subl2 $60,-72(fp) # exp -= 60;}
71: L28: cmpl -72(fp),$60 # while(exp > 60){
72: jleq L31
73: jbr L2000003
74: L2000005:
75: pushl 20(fp) # hfs
76: ldd big
77: pushd
78: ldd -68(fp)
79: pushd
80: callf $24,_Kdivd
81: ldd r0
82: std -68(fp) # temp /= (1L<<30);
83: addl2 $60,-72(fp) # exp +=60;}
84: L31: cmpl -72(fp),$-60 # while(exp < -60) {
85: jlss L2000005
86: tstl -72(fp) # if(exp >=0)
87: jlss L34
88: divl3 $2,-72(fp),r0
89: shll r0,$1,r0
90: pushl 20(fp) # hfs
91: pushl $0
92: pushl r0
93: pushl $0
94: pushl $0
95: callf $24,_Kcvtld
96: pushl 20(fp) # hfs
97: ldd r0
98: pushd
99: ldd -68(fp)
100: pushd
101: callf $24,_Kmuld # temp * (1L <<(exp/2))
102: jbr L2000006 # temp *= 1L << (exp/2));
103: L34: mnegl -72(fp),r0 # -exp
104: divl2 $2,r0 # -exp/2
105: shll r0,$1,r0
106: pushl 20(fp) # hfs
107: pushl $0
108: pushl r0
109: pushl $0
110: pushl $0
111: callf $24,_Kcvtld
112: pushl 20(fp) # hfs
113: ldd r0
114: pushd
115: ldd -68(fp)
116: pushd
117: callf $24,_Kdivd # temp / (1L <<(-exp/2))
118: L2000006:
119: ldd r0
120: std -68(fp) # temp (*/)= 1L << (exp/2));
121: clrl -76(fp)
122: L2000008:
123: pushl 20(fp) # hfs
124: ldd -68(fp)
125: pushd
126: ldd 4(fp)
127: pushd
128: callf $24,_Kdivd
129: pushl 20(fp) # hfs
130: ldd r0
131: pushd
132: ldd -68(fp)
133: pushd
134: callf $24,_Kaddd
135: pushl 20(fp) # hfs
136: ldd r0
137: pushd
138: ldd half
139: pushd
140: callf $24,_Kmuld
141: ldd r0
142: std -68(fp) # temp=0.5*(temp+arg/temp);
143: aobleq $3,-76(fp),L2000008
144: ldd -68(fp)
145: cvdf
146: stf r0
147: ret
148:
149: .data
150: .align 2
151: half: .long 0x40000000, 0x00000000 # .double .5
152: two: .long 0x41000000, 0x00000000 # .double 2
153: one: .long 0x40800000, 0x00000000 # .double 1
154: big: .long 0x4F800000, 0x00000000 # .double (1<<30)
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