ReactOS 0.4.15-dev-5672-gf73ac17
ldexpf.c
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1/*
2 * Copyright (C) 2008-2020 Advanced Micro Devices, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification,
5 * are permitted provided that the following conditions are met:
6 * 1. Redistributions of source code must retain the above copyright notice,
7 * this list of conditions and the following disclaimer.
8 * 2. Redistributions in binary form must reproduce the above copyright notice,
9 * this list of conditions and the following disclaimer in the documentation
10 * and/or other materials provided with the distribution.
11 * 3. Neither the name of the copyright holder nor the names of its contributors
12 * may be used to endorse or promote products derived from this software without
13 * specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
21 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28#include "libm.h"
29#include "libm_util.h"
30#include "libm_new.h"
31
32#define FN_PROTOTYPE_REF FN_PROTOTYPE
33#define __amd_handle_errorf _handle_errorf
34#define __amd_ldexp OP_LDEXP
35
36//#include "fn_macros.h"
37//#include "libm_util_amd.h"
38//#include "libm_special.h"
39
40float FN_PROTOTYPE_REF(ldexpf)(float x, int n)
41{
42 UT32 val,val_x;
43 unsigned int sign;
44 int exponent;
45 val.f32 = x;
46 val_x.f32 = x;
47 sign = val.u32 & 0x80000000;
48 val.u32 = val.u32 & 0x7fffffff;/* remove the sign bit */
49
50 if(val.u32 > 0x7f800000)/* x= nan */
51 #ifdef WINDOWS
52 return __amd_handle_errorf("ldexpf", __amd_ldexp, val_x.u32|0x00400000, _DOMAIN, 0, EDOM, x, (float)n, 2);
53 #else
54 {
55 if(!(val.u32 & 0x00400000)) //x is snan
56 return __amd_handle_errorf("ldexpf", __amd_ldexp, val_x.u32|0x00400000, _DOMAIN, AMD_F_INVALID, EDOM, x, (float)n, 2);
57 else
58 return x;
59 }
60 #endif
61
62 if(val.u32 == 0x7f800000)/* x = +-inf*/
63 return x;
64
65 if((val.u32 == 0x00000000) || (n==0))/* x= +-0 or n= 0*/
66 return x;
67
68 exponent = val.u32 >> 23; /* get the exponent */
69
70 if(exponent == 0)/*x is denormal*/
71 {
72 val.f32 = val.f32 * VAL_2PMULTIPLIER_SP;/*multiply by 2^24 to bring it to the normal range*/
73 exponent = (val.u32 >> 23); /* get the exponent */
74 exponent = exponent + n - MULTIPLIER_SP;
75 if(exponent < -MULTIPLIER_SP)/*underflow*/
76 {
77 val.u32 = sign | 0x00000000;
79 }
80 if(exponent > 254)/*overflow*/
81 {
82 val.u32 = sign | 0x7f800000;
84 }
85
86 exponent += MULTIPLIER_SP;
87 val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff);
88 val.f32 = val.f32 * VAL_2PMMULTIPLIER_SP;
89 return val.f32;
90 }
91
92 exponent += n;
93
94 if(exponent < -MULTIPLIER_SP)/*underflow*/
95 {
96 val.u32 = sign | 0x00000000;
98 }
99
100 if(exponent < 1)/*x is normal but output is debnormal*/
101 {
102 exponent += MULTIPLIER_SP;
103 val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff);
104 val.f32 = val.f32 * VAL_2PMMULTIPLIER_SP;
105 return val.f32;
106 }
107
108 if(exponent > 254)/*overflow*/
109 {
110 val.u32 = sign | 0x7f800000;
111 return __amd_handle_errorf("ldexpf", __amd_ldexp, val.u32, _OVERFLOW, AMD_F_INEXACT|AMD_F_OVERFLOW, ERANGE, x, (float)n, 2);
112 }
113
114 val.u32 = sign | (exponent << 23) | (val.u32 & 0x007fffff);/*x is normal and output is normal*/
115 return val.f32;
116}
117
118
#define ERANGE
Definition: acclib.h:92
#define EDOM
Definition: errno.h:39
GLint GLint GLint GLint GLint x
Definition: gl.h:1548
GLdouble n
Definition: glext.h:7729
GLuint GLfloat * val
Definition: glext.h:7180
#define _DOMAIN
Definition: math.h:39
#define _UNDERFLOW
Definition: math.h:42
#define _OVERFLOW
Definition: math.h:41
#define __amd_ldexp
Definition: ldexpf.c:34
float FN_PROTOTYPE_REF() ldexpf(float x, int n)
Definition: ldexpf.c:40
#define FN_PROTOTYPE_REF
Definition: ldexpf.c:32
#define __amd_handle_errorf
Definition: ldexpf.c:33
#define AMD_F_INEXACT
Definition: libm_new.h:82
#define AMD_F_UNDERFLOW
Definition: libm_new.h:84
#define AMD_F_INVALID
Definition: libm_new.h:86
#define AMD_F_OVERFLOW
Definition: libm_new.h:83
static const float VAL_2PMULTIPLIER_SP
Definition: libm_util.h:40
static const float VAL_2PMMULTIPLIER_SP
Definition: libm_util.h:41
#define MULTIPLIER_SP
Definition: libm_util.h:35
#define sign(x)
Definition: mapdesc.cc:613
Definition: libm_new.h:41
F32 f32
Definition: libm_new.h:42
U32 u32
Definition: libm_new.h:43