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/* Bitwise manipulation over float. Function prototypes.
Copyright (C) 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _FLOAT_BITWISE_
#define _FLOAT_BITWISE_ 1
#include <math_private.h>
/* Returns (int)(num & 0x7FFFFFF0 == value) */
static inline
int __float_and_test28 (float num, float value)
{
float ret;
#ifdef _ARCH_PWR7
vector int mask = (vector int) {
0x7ffffffe, 0x00000000, 0x00000000, 0x0000000
};
__asm__ (
/* the 'f' constrain is use on mask because we just need
* to compare floats, not full vector */
"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask)
);
#else
int32_t inum;
GET_FLOAT_WORD(inum, num);
inum = (inum & 0x7ffffff0);
SET_FLOAT_WORD(ret, inum);
#endif
return (ret == value);
}
/* Returns (int)(num & 0x7FFFFF00 == value) */
static inline
int __float_and_test24 (float num, float value)
{
float ret;
#ifdef _ARCH_PWR7
vector int mask = (vector int) {
0x7fffffe0, 0x00000000, 0x00000000, 0x0000000
};
__asm__ (
"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask)
);
#else
int32_t inum;
GET_FLOAT_WORD(inum, num);
inum = (inum & 0x7fffff00);
SET_FLOAT_WORD(ret, inum);
#endif
return (ret == value);
}
/* Returns (float)(num & 0x7F800000) */
static inline
float __float_and8 (float num)
{
float ret;
#ifdef _ARCH_PWR7
vector int mask = (vector int) {
0x7ff00000, 0x00000000, 0x00000000, 0x00000000
};
__asm__ (
"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask)
);
#else
int32_t inum;
GET_FLOAT_WORD(inum, num);
inum = (inum & 0x7f800000);
SET_FLOAT_WORD(ret, inum);
#endif
return ret;
}
/* Returns ((int32_t)(num & 0x7F800000) >> 23) */
static inline
int32_t __float_get_exp (float num)
{
int32_t inum;
#ifdef _ARCH_PWR7
float ret;
vector int mask = (vector int) {
0x7ff00000, 0x00000000, 0x00000000, 0x00000000
};
__asm__ (
"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask)
);
GET_FLOAT_WORD(inum, ret);
#else
GET_FLOAT_WORD(inum, num);
inum = inum & 0x7f800000;
#endif
return inum >> 23;
}
#endif /* s_float_bitwise.h */
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