mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-30 10:45:40 +03:00
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/* 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 */
|