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1.1 root 1:
2: #include "fp.h"
3: #include "fp_in_krnl.h"
4:
5:
6: .text
7: .globl Ksfnorm # Ksfnorm(hfs)
8: Ksfnorm: .word 0x007c
9: clrl r1
10: movl r0,r4 /* copy to temporary. */
11: jeql retzero
12: clrl r3 /* r3 - pos of m.s.b */
13: inr00: ffs r4,r6
14: incl r6
15: addl2 r6,r3
16: shrl r6,r4,r4
17: jneq inr00
18:
19: cmpshift:
20: /* compute the shift (r4). */
21: subl3 r3,$HID_POS,r4
22: jlss shiftr /* if less then zero we shift right. */
23: shll r4,r0,r0 /* else we shift left. */
24: subl2 r4,r2 /* uodate exponent. */
25: jleq underflow /* if less then 0 (biased) it is underflow. */
26: jmp combine /* go to combine exponent and fraction. */
27: shiftr:
28: mnegl r4,r4
29: shrl r4,r0,r0 /* shift right. */
30: addl2 r4,r2 /* update exponent */
31: cmpl r2,$256
32: jgeq overflow /* check for overflow. */
33: combine:
34: andl2 $CLEARHID,r0 /* clear the hidden bit. */
35: shal $EXPSHIFT,r2,r2 /* shift the exponent to its proper place. */
36: orl2 r2,r0
37: ret
38:
39: underflow:
40: orl2 $HFS_UNDF,*4(fp)
41: ret
42:
43: overflow:
44: orl2 $HFS_OVF,*4(fp)
45: ret
46: retzero:
47: clrl r0
48: ret
49:
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