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c4d17461e0
I get some math test-failures on s390 for float/double/ldouble for various lrint/lround functions like: lrint (0x1p64): Exception "Inexact" set lrint (-0x1p64): Exception "Inexact" set lround (0x1p64): Exception "Inexact" set lround (-0x1p64): Exception "Inexact" set ... GCC emits "convert to fixed" instructions for casting floating point values to integer values. These instructions raise invalid and inexact exceptions if the floating point value exceeds the integer type ranges. This patch enables the various FIX_DBL_LONG_CONVERT_OVERFLOW macros in order to avoid a cast from floating point to integer type and raise the invalid exception with feraiseexcept. The ldbl-128 rint/round functions are now using the same logic. ChangeLog: [BZ #19486] * sysdeps/s390/fix-fp-int-convert-overflow.h: New File. * sysdeps/generic/fix-fp-int-convert-overflow.h (FIX_LDBL_LONG_CONVERT_OVERFLOW, FIX_LDBL_LLONG_CONVERT_OVERFLOW): New define. * sysdeps/arm/fix-fp-int-convert-overflow.h: Likewise. * sysdeps/mips/mips32/fpu/fix-fp-int-convert-overflow.h: Likewise. * sysdeps/ieee754/ldbl-128/s_lrintl.c (__lrintl): Avoid conversions to long int where inexact exceptions could be raised. * sysdeps/ieee754/ldbl-128/s_lroundl.c (__lroundl): Likewise. * sysdeps/ieee754/ldbl-128/s_llrintl.c (__llrintl): Avoid conversions to long long int where inexact exceptions could be raised. * sysdeps/ieee754/ldbl-128/s_llroundl.c (__llroundl): Likewise.
114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
/* Round long double value to long int.
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Copyright (C) 1997-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
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Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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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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#include <fenv.h>
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#include <limits.h>
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#include <math.h>
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#include <math_private.h>
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#include <fix-fp-int-convert-overflow.h>
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long int
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__lroundl (long double x)
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{
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int64_t j0;
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u_int64_t i1, i0;
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long int result;
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int sign;
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GET_LDOUBLE_WORDS64 (i0, i1, x);
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j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1;
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i0 &= 0x0000ffffffffffffLL;
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i0 |= 0x0001000000000000LL;
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if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
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{
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if (j0 < 48)
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{
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if (j0 < 0)
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return j0 < -1 ? 0 : sign;
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else
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{
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i0 += 0x0000800000000000LL >> j0;
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result = i0 >> (48 - j0);
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#ifdef FE_INVALID
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if (sizeof (long int) == 4
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&& sign == 1
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&& result == LONG_MIN)
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/* Rounding brought the value out of range. */
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feraiseexcept (FE_INVALID);
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#endif
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}
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}
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else if (j0 >= 112)
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result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
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else
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{
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u_int64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));
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if (j < i1)
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++i0;
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if (j0 == 48)
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result = (long int) i0;
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else
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{
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result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0));
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#ifdef FE_INVALID
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if (sizeof (long int) == 8
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&& sign == 1
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&& result == LONG_MIN)
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/* Rounding brought the value out of range. */
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feraiseexcept (FE_INVALID);
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#endif
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}
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}
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}
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else
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{
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/* The number is too large. Unless it rounds to LONG_MIN,
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FE_INVALID must be raised and the return value is
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unspecified. */
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#ifdef FE_INVALID
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if (FIX_LDBL_LONG_CONVERT_OVERFLOW
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&& !(sign == -1 && x > (long double) LONG_MIN - 0.5L))
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{
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feraiseexcept (FE_INVALID);
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return sign == 1 ? LONG_MAX : LONG_MIN;
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}
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else if (!FIX_LDBL_LONG_CONVERT_OVERFLOW
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&& x <= (long double) LONG_MIN - 0.5L)
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{
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/* If truncation produces LONG_MIN, the cast will not raise
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the exception, but may raise "inexact". */
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feraiseexcept (FE_INVALID);
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return LONG_MIN;
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}
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#endif
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/* The number is too large. It is left implementation defined
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what happens. */
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return (long int) x;
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}
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return sign * result;
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}
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weak_alias (__lroundl, lroundl)
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