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603e84104c
http://sourceware.org/ml/libc-alpha/2013-07/msg00200.html This works around the fact that vsx is disabled in current little-endian gcc. Also, float constants take 4 bytes in memory vs. 16 bytes for vector constants, and we don't need to write one lot of masks for double (register format) and another for float (mem format). * sysdeps/powerpc/fpu/s_float_bitwise.h (__float_and_test28): Don't use vector int constants. (__float_and_test24, __float_and8, __float_get_exp): Likewise.
116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/* Bitwise manipulation over float. Function prototypes.
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Copyright (C) 2011-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Adhemerval Zanella <azanella@br.ibm.com>, 2011
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef _FLOAT_BITWISE_
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#define _FLOAT_BITWISE_ 1
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#include <math_private.h>
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/* Returns (int)(num & 0x7FFFFFF0 == value) */
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static inline int
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__float_and_test28 (float num, float value)
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{
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float ret;
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#ifdef _ARCH_PWR7
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union {
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int i;
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float f;
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} mask = { .i = 0x7ffffff0 };
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__asm__ (
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/* the 'f' constraint is used on mask because we just need
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* to compare floats, not full vector */
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"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
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);
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#else
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int32_t inum;
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GET_FLOAT_WORD(inum, num);
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inum = (inum & 0x7ffffff0);
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SET_FLOAT_WORD(ret, inum);
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#endif
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return (ret == value);
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}
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/* Returns (int)(num & 0x7FFFFF00 == value) */
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static inline int
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__float_and_test24 (float num, float value)
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{
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float ret;
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#ifdef _ARCH_PWR7
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union {
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int i;
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float f;
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} mask = { .i = 0x7fffff00 };
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__asm__ (
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"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
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);
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#else
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int32_t inum;
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GET_FLOAT_WORD(inum, num);
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inum = (inum & 0x7fffff00);
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SET_FLOAT_WORD(ret, inum);
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#endif
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return (ret == value);
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}
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/* Returns (float)(num & 0x7F800000) */
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static inline float
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__float_and8 (float num)
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{
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float ret;
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#ifdef _ARCH_PWR7
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union {
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int i;
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float f;
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} mask = { .i = 0x7f800000 };
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__asm__ (
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"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
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);
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#else
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int32_t inum;
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GET_FLOAT_WORD(inum, num);
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inum = (inum & 0x7f800000);
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SET_FLOAT_WORD(ret, inum);
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#endif
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return ret;
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}
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/* Returns ((int32_t)(num & 0x7F800000) >> 23) */
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static inline int32_t
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__float_get_exp (float num)
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{
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int32_t inum;
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#ifdef _ARCH_PWR7
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float ret;
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union {
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int i;
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float f;
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} mask = { .i = 0x7f800000 };
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__asm__ (
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"xxland %x0,%x1,%x2" : "=f" (ret) : "f" (num), "f" (mask.f)
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);
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GET_FLOAT_WORD(inum, ret);
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#else
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GET_FLOAT_WORD(inum, num);
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inum = inum & 0x7f800000;
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#endif
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return inum >> 23;
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}
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#endif /* s_float_bitwise.h */
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