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Diffstat (limited to 'sysdeps/wordsize-32/fixsfdi.c')
-rw-r--r-- | sysdeps/wordsize-32/fixsfdi.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/sysdeps/wordsize-32/fixsfdi.c b/sysdeps/wordsize-32/fixsfdi.c new file mode 100644 index 0000000000..c0235d42a6 --- /dev/null +++ b/sysdeps/wordsize-32/fixsfdi.c @@ -0,0 +1,102 @@ +/* Convert float to 64-bit int. + Copyright (C) 1989, 1992-2001, 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <endian.h> +#include <stdlib.h> +#include <bits/wordsize.h> +#include <shlib-compat.h> + +#if __WORDSIZE != 32 +# error This is for 32-bit targets only +#endif + +#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2_6) + +typedef unsigned int UQItype __attribute__ ((mode (QI))); +typedef int SItype __attribute__ ((mode (SI))); +typedef unsigned int USItype __attribute__ ((mode (SI))); +typedef int DItype __attribute__ ((mode (DI))); +typedef unsigned int UDItype __attribute__ ((mode (DI))); +typedef float SFtype __attribute__ ((mode (SF))); +typedef float DFtype __attribute__ ((mode (DF))); +#define Wtype SItype +#define HWtype SItype +#define DWtype DItype +#define UWtype USItype +#define UHWtype USItype +#define UDWtype UDItype +#define W_TYPE_SIZE 32 + +#include <stdlib/longlong.h> + +#if __BYTE_ORDER == __BIG_ENDIAN +struct DWstruct { Wtype high, low;}; +#elif __BYTE_ORDER == __LITTLE_ENDIAN +struct DWstruct { Wtype low, high;}; +#else +#error Unhandled endianity +#endif +typedef union { struct DWstruct s; DWtype ll; } DWunion; + + +#define WORD_SIZE __WORDSIZE +#define HIGH_WORD_COEFF (((UDWtype) 1) << WORD_SIZE) + + +DWtype +___fixunssfDI (SFtype original_a) +{ + /* Convert the SFtype to a DFtype, because that is surely not going + to lose any bits. Some day someone else can write a faster version + that avoids converting to DFtype, and verify it really works right. */ + DFtype a = original_a; + DFtype b; + UDWtype v; + + if (a < 0) + return 0; + + /* Compute high word of result, as a flonum. */ + b = (a / HIGH_WORD_COEFF); + /* Convert that to fixed (but not to DWtype!), + and shift it into the high word. */ + v = (UWtype) b; + v <<= WORD_SIZE; + /* Remove high part from the DFtype, leaving the low part as flonum. */ + a -= (DFtype) v; + /* Convert that to fixed (but not to DWtype!) and add it in. + Sometimes A comes out negative. This is significant, since + A has more bits than a long int does. */ + if (a < 0) + v -= (UWtype) (- a); + else + v += (UWtype) a; + return v; +} +symbol_version (___fixunssfDI, __fixunssfDI, GLIBC_2.0); + + +DWtype +___fixsfdi (SFtype a) +{ + if (a < 0) + return - __fixunssfDI (-a); + return __fixunssfDI (a); +} +symbol_version (___fixsfdi, __fixsfdi, GLIBC_2.0); |