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]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
23 */
24 /*
25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
27 */
28
29 .file "exp2.s"
30
31 #include "libm.h"
32 LIBM_ANSI_PRAGMA_WEAK(exp2,function)
33 #include "libm_synonyms.h"
34
35 ENTRY(exp2)
36 movl 8(%esp),%ecx / ecx <-- hi_32(x)
37 andl $0x7fffffff,%ecx / ecx <-- hi_32(|x|)
38 cmpl $0x3ff00000,%ecx / Is |x| < 1?
39 jb .shortcut / If so, take a shortcut.
40 je .check_tail / |x| may be only slightly < ln(2)
41 cmpl $0x7ff00000,%ecx / hi_32(|x|) >= hi_32(INF)?
42 jae .not_finite / if so, x is not finite
43 .finite_non_special: / Here, 1 < |x| < INF
44 fldl 4(%esp) / push arg
45 fld %st(0) / duplicate stack top
46 frndint / [x],x
47 fucom / x integral?
48 fstsw %ax
49 sahf
50 je .x_integral / branch if x integral
51 fxch / x, [x]
52 fsub %st(1),%st / x-[x], [x]
53 f2xm1 / 2**(x-[x])-1, [x]
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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]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
23 */
24 /*
25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
27 */
28
29 .file "exp2.s"
30
31 #include "libm.h"
32 LIBM_ANSI_PRAGMA_WEAK(exp2,function)
33
34 ENTRY(exp2)
35 movl 8(%esp),%ecx / ecx <-- hi_32(x)
36 andl $0x7fffffff,%ecx / ecx <-- hi_32(|x|)
37 cmpl $0x3ff00000,%ecx / Is |x| < 1?
38 jb .shortcut / If so, take a shortcut.
39 je .check_tail / |x| may be only slightly < ln(2)
40 cmpl $0x7ff00000,%ecx / hi_32(|x|) >= hi_32(INF)?
41 jae .not_finite / if so, x is not finite
42 .finite_non_special: / Here, 1 < |x| < INF
43 fldl 4(%esp) / push arg
44 fld %st(0) / duplicate stack top
45 frndint / [x],x
46 fucom / x integral?
47 fstsw %ax
48 sahf
49 je .x_integral / branch if x integral
50 fxch / x, [x]
51 fsub %st(1),%st / x-[x], [x]
52 f2xm1 / 2**(x-[x])-1, [x]
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