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Diffstat (limited to 'gcc-4.9/libgcc/config/s390/32/_fixdfdi.c')
| -rw-r--r-- | gcc-4.9/libgcc/config/s390/32/_fixdfdi.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gcc-4.9/libgcc/config/s390/32/_fixdfdi.c b/gcc-4.9/libgcc/config/s390/32/_fixdfdi.c new file mode 100644 index 000000000..e6dd4d114 --- /dev/null +++ b/gcc-4.9/libgcc/config/s390/32/_fixdfdi.c @@ -0,0 +1,113 @@ +/* Definitions of target machine for GNU compiler, for IBM S/390 + Copyright (C) 1999-2014 Free Software Foundation, Inc. + Contributed by Hartmut Penner (hpenner@de.ibm.com) and + Ulrich Weigand (uweigand@de.ibm.com). + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 3, or (at your option) any later +version. + +GCC 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 General Public License +for more details. + +Under Section 7 of GPL version 3, you are granted additional +permissions described in the GCC Runtime Library Exception, version +3.1, as published by the Free Software Foundation. + +You should have received a copy of the GNU General Public License and +a copy of the GCC Runtime Library Exception along with this program; +see the files COPYING3 and COPYING.RUNTIME respectively. If not, see +<http://www.gnu.org/licenses/>. */ + +#ifndef __s390x__ + +#define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF) +#define EXPONENT_BIAS 1023 +#define MANTISSA_BITS 52 +#define PRECISION (MANTISSA_BITS + 1) +#define SIGNBIT 0x80000000 +#define SIGN(fp) ((fp.l.upper) & SIGNBIT) +#define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL) +#define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1)) +#define HIDDEND_LL ((UDItype_x)1 << MANTISSA_BITS) +#define LLONG_MAX 9223372036854775807LL +#define LLONG_MIN (-LLONG_MAX - 1LL) + +typedef int DItype_x __attribute__ ((mode (DI))); +typedef unsigned int UDItype_x __attribute__ ((mode (DI))); +typedef int SItype_x __attribute__ ((mode (SI))); +typedef unsigned int USItype_x __attribute__ ((mode (SI))); + +union double_long { + double d; + struct { + SItype_x upper; + USItype_x lower; + } l; + UDItype_x ll; +}; + +static __inline__ void +fexceptdiv (float d, float e) +{ + __asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) ); +} + +DItype_x __fixdfdi (double a1); + +/* convert double to int */ +DItype_x +__fixdfdi (double a1) +{ + register union double_long dl1; + register int exp; + register DItype_x l; + + dl1.d = a1; + + /* +/- 0, denormalized */ + if (!EXPD (dl1)) + return 0; + + /* The exponent - considered the binary point at the right end of + the mantissa. */ + exp = EXPD (dl1) - EXPONENT_BIAS - MANTISSA_BITS; + + /* number < 1 */ + if (exp <= -PRECISION) + return 0; + + /* NaN */ + + if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */ + { + /* C99 Annex F.4 requires an "invalid" exception to be thrown. */ + fexceptdiv (0.0, 0.0); + return 0x8000000000000000ULL; + } + + /* Number big number & +/- inf */ + if (exp >= 11) { + /* Don't throw an exception for -1p+63 */ + if (!SIGN (dl1) || exp > 11 || FRACD_LL (dl1) != 0) + /* C99 Annex F.4 requires an "invalid" exception to be thrown. */ + fexceptdiv (0.0, 0.0); + return SIGN (dl1) ? LLONG_MIN : LLONG_MAX; + } + + l = MANTD_LL(dl1); + + /* shift down until exp < 12 or l = 0 */ + if (exp > 0) + l <<= exp; + else + l >>= -exp; + + return (SIGN (dl1) ? -l : l); +} +#endif /* !__s390x__ */ |