4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
35 lt2_hi
: .long 0xfbd00000, 0x9a209a84, 0x00003ffd
36 lt2_lo
: .long 0x653f4837, 0x8677076a, 0x0000bfc9
39 movl
12(%esp
),%ecx
/ cx
<--sign
&bexp
(x
)
40 andl $
0x00007fff,%ecx
/ ecx
<-- zero_xtnd
(bexp
(x
))
41 cmpl $
0x00003ffd,%ecx
/ Is |x|
< log10
(2)?
42 jb
.shortcut / If so, take a shortcut.
43 je
.check_tail / maybe |x| only slightly < log10(2)
44 cmpl $
0x00007fff,%ecx
/ bexp
(|x|
) = bexp
(INF
)?
45 je
.not_finite / if so, x is not finite
46 cmpl $
0x0000400e,%ecx
/ |x|
< 32768 = 2^
15?
47 jb
.finite_non_special / if so, proceed with argument reduction
51 .finite_non_special: / Here, log10(2) < |x| < 2^15
54 fldl2t
/ log2
(10), x
, x
55 fmulp
/ z
:= x
*log2
(10), x
57 fst
%st(2) / [z
], x
, [z
]
59 fldt PIC_L
(lt2_hi
) / lt2_hi
, [z
], x
, [z
]
60 fmulp
/ [z
]*lt2_hi
, x
, [z
]
61 fsubrp
%st,%st(1) / x-
[z
]*lt2_hi
, [z
]
62 fldt PIC_L
(lt2_lo
) / lt2_lo
, x-
[z
]*lt2_hi
, [z
]
64 fmul %st(2),%st / [z
]*lt2_lo
, x-
[z
]*lt2_hi
, [z
]
65 fsubrp
%st,%st(1) / r
:= x-
[z
]*log10
(2), [z
]
66 fldl2t
/ log2
(10), r
, [z
]
67 fmulp
/ f
:= r
*log2
(10), [z
]
70 faddp
%st,%st(1) / 2^f
, [z
]
77 movl
8(%esp
),%ecx
/ ecx
<-- hi_32
(sgnfcnd
(x
))
78 cmpl $
0x9a209a84,%ecx
/ Is |x|
< log10
(2)?
79 ja
.finite_non_special
81 movl
4(%esp
),%edx
/ edx
<-- lo_32
(sgnfcnd
(x
))
82 cmpl $
0xfbcff798,%edx
/ Is |x| slightly
> log10
(2)?
83 ja
.finite_non_special / branch if |x| slightly > log10(2)
85 / Here
, |x|
< log10
(2), so |z|
= |x
/log10
(2)|
< 1
86 / whence z is in f2xm1
's domain.
89 fmulp / z := x*log2(10)
92 faddp %st,%st(1) / 10^x
96 movl 8(%esp),%ecx / ecx <-- hi_32(sgnfcnd(x))
97 cmpl $0x80000000,%ecx / hi_32(sgnfcnd(x)) = hi_32(sgnfcnd(INF))?
98 jne .NaN_or_pinf / if not, x is NaN or unsupp.
99 movl 4(%esp),%edx / edx <-- lo_32(sgnfcnd(x))
100 cmpl $0,%edx / lo_32(sgnfcnd(x)) = 0?
101 jne .NaN_or_pinf / if not, x is NaN
102 movl 12(%esp),%eax / ax <-- sign&bexp((x))
103 andl $0x00008000,%eax / here, x is infinite, but +/-?
104 jz .NaN_or_pinf / branch if x = +INF
105 fldz / Here, x = -inf, so return 0
109 / Here, x = NaN or +inf, so load x and return immediately.