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Fix cexp overflow (bug 13892).

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This commit is contained in:
Joseph Myers 2012-03-22 19:38:09 +00:00
parent 81b035fe63
commit 7c69cd143b
8 changed files with 181 additions and 27 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2012-03-22 Joseph Myers <joseph@codesourcery.com>
[BZ #13892]
* math/s_cexp.c: Include <float.h>.
(__cexp): Handle exp result overflowing not necessarily
overflowing both real and imaginary parts of result.
* math/s_cexpf.c: Likewise.
* math/s_cexpl.c: Likewise.
* math/libm-test.inc (cexp_test): Add more tests.
* sysdeps/i386/fpu/libm-test-ulps: Update.
* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2012-03-22 H.J. Lu <hongjiu.lu@intel.com>
* include/link.h (ELFW): New macro.

3
NEWS
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@ -16,7 +16,8 @@ Version 2.16
13525, 13526, 13527, 13528, 13529, 13530, 13531, 13532, 13533, 13547,
13551, 13552, 13553, 13555, 13559, 13566, 13583, 13618, 13637, 13656,
13658, 13673, 13695, 13704, 13706, 13726, 13738, 13786, 13792, 13806,
13824, 13840, 13841, 13844, 13846, 13851, 13852, 13854, 13871, 13883
13824, 13840, 13841, 13844, 13846, 13851, 13852, 13854, 13871, 13883,
13892
* ISO C11 support:

29
math/libm-test.inc
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@ -1909,6 +1909,35 @@ cexp_test (void)
TEST_c_c (cexp, -10000, 0x1p16383L, 1.045876464564882298442774542991176546722e-4343L, 4.421154026488516836023811173959413420548e-4344L);
#endif
TEST_c_c (cexp, 88.75, 0.75, 2.558360358486542817001900410314204322891e38L, 2.383359453227311447654736314679677655100e38L);
TEST_c_c (cexp, -95, 0.75, 4.039714446238306526889476684000081624047e-42L, 3.763383677300535390271646960780570275931e-42L);
#ifndef TEST_FLOAT
TEST_c_c (cexp, 709.8125, 0.75, 1.355121963080879535248452862759108365762e308L, 1.262426823598609432507811340856186873507e308L);
TEST_c_c (cexp, -720, 0.75, 1.486960657116368433685753325516638551722e-313L, 1.385247284245720590980701226843815229385e-313L);
#endif
#if defined TEST_LDOUBLE && LDBL_MAX_EXP >= 16384
TEST_c_c (cexp, 11356.5625, 0.75, 9.052188470850960144814815984311663764287e4931L, 8.432986734191301036267148978260970230200e4931L);
TEST_c_c (cexp, -11370, 0.75, 8.631121063182211587489310508568170739592e-4939L, 8.040721827809267291427062346918413482824e-4939L);
#endif
#ifdef TEST_FLOAT
TEST_c_c (cexp, 180, 0x1p-149, plus_infty, 2.087071793345235105931967606907855310664e33L, OVERFLOW_EXCEPTION);
#endif
#if defined TEST_DOUBLE || (defined TEST_LDOUBLE && LDBL_MAX_EXP == 1024)
TEST_c_c (cexp, 1440, 0x1p-1074, plus_infty, 1.196295853897226111293303155636183216483e302L, OVERFLOW_EXCEPTION);
#endif
#if defined TEST_LDOUBLE && LDBL_MAX_EXP >= 16384
TEST_c_c (cexp, 22730, 0x1p-16434L, plus_infty, 2.435706297811211974162115164702304105374e4924L, OVERFLOW_EXCEPTION);
#endif
TEST_c_c (cexp, 1e6, 0, plus_infty, 0, OVERFLOW_EXCEPTION);
TEST_c_c (cexp, 1e6, min_value, plus_infty, plus_infty, OVERFLOW_EXCEPTION);
TEST_c_c (cexp, 1e6, -min_value, plus_infty, minus_infty, OVERFLOW_EXCEPTION);
END (cexp, complex);
}

31
math/s_cexp.c
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@ -1,5 +1,5 @@
/* Return value of complex exponential function for double complex value.
Copyright (C) 1997, 2011 Free Software Foundation, Inc.
Copyright (C) 1997-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -21,7 +21,7 @@
#include <fenv.h>
#include <math.h>
#include <math_private.h>
#include <float.h>
__complex__ double
__cexp (__complex__ double x)
@ -36,20 +36,35 @@ __cexp (__complex__ double x)
if (__builtin_expect (icls >= FP_ZERO, 1))
{
/* Imaginary part is finite. */
double exp_val = __ieee754_exp (__real__ x);
const int t = (int) ((DBL_MAX_EXP - 1) * M_LN2);
double sinix, cosix;
__sincos (__imag__ x, &sinix, &cosix);
if (isfinite (exp_val))
if (__real__ x > t)
{
__real__ retval = exp_val * cosix;
__imag__ retval = exp_val * sinix;
double exp_t = __ieee754_exp (t);
__real__ x -= t;
sinix *= exp_t;
cosix *= exp_t;
if (__real__ x > t)
{
__real__ x -= t;
sinix *= exp_t;
cosix *= exp_t;
}
}
if (__real__ x > t)
{
/* Overflow (original real part of x > 3t). */
__real__ retval = DBL_MAX * cosix;
__imag__ retval = DBL_MAX * sinix;
}
else
{
__real__ retval = __copysign (exp_val, cosix);
__imag__ retval = __copysign (exp_val, sinix);
double exp_val = __ieee754_exp (__real__ x);
__real__ retval = exp_val * cosix;
__imag__ retval = exp_val * sinix;
}
}
else

31
math/s_cexpf.c
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@ -1,5 +1,5 @@
/* Return value of complex exponential function for float complex value.
Copyright (C) 1997, 2011 Free Software Foundation, Inc.
Copyright (C) 1997-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -21,7 +21,7 @@
#include <fenv.h>
#include <math.h>
#include <math_private.h>
#include <float.h>
__complex__ float
__cexpf (__complex__ float x)
@ -36,20 +36,35 @@ __cexpf (__complex__ float x)
if (__builtin_expect (icls >= FP_ZERO, 1))
{
/* Imaginary part is finite. */
float exp_val = __ieee754_expf (__real__ x);
const int t = (int) ((FLT_MAX_EXP - 1) * M_LN2);
float sinix, cosix;
__sincosf (__imag__ x, &sinix, &cosix);
if (isfinite (exp_val))
if (__real__ x > t)
{
__real__ retval = exp_val * cosix;
__imag__ retval = exp_val * sinix;
float exp_t = __ieee754_expf (t);
__real__ x -= t;
sinix *= exp_t;
cosix *= exp_t;
if (__real__ x > t)
{
__real__ x -= t;
sinix *= exp_t;
cosix *= exp_t;
}
}
if (__real__ x > t)
{
/* Overflow (original real part of x > 3t). */
__real__ retval = FLT_MAX * cosix;
__imag__ retval = FLT_MAX * sinix;
}
else
{
__real__ retval = __copysignf (exp_val, cosix);
__imag__ retval = __copysignf (exp_val, sinix);
float exp_val = __ieee754_expf (__real__ x);
__real__ retval = exp_val * cosix;
__imag__ retval = exp_val * sinix;
}
}
else

31
math/s_cexpl.c
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@ -1,5 +1,5 @@
/* Return value of complex exponential function for long double complex value.
Copyright (C) 1997, 2011 Free Software Foundation, Inc.
Copyright (C) 1997-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
@ -21,7 +21,7 @@
#include <fenv.h>
#include <math.h>
#include <math_private.h>
#include <float.h>
__complex__ long double
__cexpl (__complex__ long double x)
@ -36,20 +36,35 @@ __cexpl (__complex__ long double x)
if (__builtin_expect (icls >= FP_ZERO, 1))
{
/* Imaginary part is finite. */
long double exp_val = __ieee754_expl (__real__ x);
const int t = (int) ((LDBL_MAX_EXP - 1) * M_LN2l);
long double sinix, cosix;
__sincosl (__imag__ x, &sinix, &cosix);
if (isfinite (exp_val))
if (__real__ x > t)
{
__real__ retval = exp_val * cosix;
__imag__ retval = exp_val * sinix;
long double exp_t = __ieee754_expl (t);
__real__ x -= t;
sinix *= exp_t;
cosix *= exp_t;
if (__real__ x > t)
{
__real__ x -= t;
sinix *= exp_t;
cosix *= exp_t;
}
}
if (__real__ x > t)
{
/* Overflow (original real part of x > 3t). */
__real__ retval = LDBL_MAX * cosix;
__imag__ retval = LDBL_MAX * sinix;
}
else
{
__real__ retval = __copysignl (exp_val, cosix);
__imag__ retval = __copysignl (exp_val, sinix);
long double exp_val = __ieee754_expl (__real__ x);
__real__ retval = exp_val * cosix;
__imag__ retval = exp_val * sinix;
}
}
else

37
sysdeps/i386/fpu/libm-test-ulps
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@ -442,6 +442,14 @@ float: 1
ifloat: 1
ildouble: 1
ldouble: 1
Test "Real part of: cexp (-95 + 0.75 i) == 4.039714446238306526889476684000081624047e-42 + 3.763383677300535390271646960780570275931e-42 i":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (-95 + 0.75 i) == 4.039714446238306526889476684000081624047e-42 + 3.763383677300535390271646960780570275931e-42 i":
double: 1
idouble: 1
Test "Imaginary part of: cexp (0 + 0x1p65 i) == 0.99888622066058013610642172179340364209972 - 0.047183876212354673805106149805700013943218 i":
float: 1
ifloat: 1
@ -456,6 +464,12 @@ ldouble: 1
Test "Imaginary part of: cexp (0.75 + 1.25 i) == 0.667537446429131586942201977015932112 + 2.00900045494094876258347228145863909 i":
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (11356.5625 + 0.75 i) == 9.052188470850960144814815984311663764287e4931 + 8.432986734191301036267148978260970230200e4931 i":
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (1440 + 0x1p-1074 i) == inf + 1.196295853897226111293303155636183216483e302 i plus overflow exception":
double: 1
idouble: 1
Test "Real part of: cexp (50 + 0x1p127 i) == 4.053997150228616856622417636046265337193e21 + 3.232070315463388524466674772633810238819e21 i":
double: 2
idouble: 2
@ -469,6 +483,24 @@ ldouble: 1
Test "Real part of: cexp (500 + 0x1p1023 i) == -1.159886268932754433233243794561351783426e217 + 7.904017694554466595359379965081774849708e216 i":
double: 1
idouble: 1
Test "Real part of: cexp (709.8125 + 0.75 i) == 1.355121963080879535248452862759108365762e308 + 1.262426823598609432507811340856186873507e308 i":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (709.8125 + 0.75 i) == 1.355121963080879535248452862759108365762e308 + 1.262426823598609432507811340856186873507e308 i":
double: 1
idouble: 1
Test "Real part of: cexp (88.75 + 0.75 i) == 2.558360358486542817001900410314204322891e38 + 2.383359453227311447654736314679677655100e38 i":
float: 1
ifloat: 1
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (88.75 + 0.75 i) == 2.558360358486542817001900410314204322891e38 + 2.383359453227311447654736314679677655100e38 i":
float: 1
ifloat: 1
ildouble: 1
ldouble: 1
# clog
Test "Real part of: clog (0.75 + 1.25 i) == 0.376885901188190075998919126749298416 + 1.03037682652431246378774332703115153 i":
@ -861,6 +893,8 @@ ifloat: 1
ildouble: 2
ldouble: 2
Test "Real part of: cpow (0.75 + 1.25 i, 1.0 + 0.0 i) == 0.75 + 1.25 i":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "Imaginary part of: cpow (0.75 + 1.25 i, 1.0 + 0.0 i) == 0.75 + 1.25 i":
@ -873,6 +907,9 @@ idouble: 2
ifloat: 3
ildouble: 3
ldouble: 3
Test "Imaginary part of: cpow (0.75 + 1.25 i, 1.0 + 1.0 i) == 0.0846958290317209430433805274189191353 + 0.513285749182902449043287190519090481 i":
double: 1
idouble: 1
Test "Real part of: cpow (2 + 0 i, 10 + 0 i) == 1024.0 + 0.0 i":
ildouble: 1
ldouble: 1

34
sysdeps/x86_64/fpu/libm-test-ulps
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@ -488,12 +488,24 @@ ldouble: 1
Test "Imaginary part of: cexp (-2.0 - 3.0 i) == -0.13398091492954261346140525546115575 - 0.019098516261135196432576240858800925 i":
float: 1
ifloat: 1
Test "Real part of: cexp (-95 + 0.75 i) == 4.039714446238306526889476684000081624047e-42 + 3.763383677300535390271646960780570275931e-42 i":
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (-95 + 0.75 i) == 4.039714446238306526889476684000081624047e-42 + 3.763383677300535390271646960780570275931e-42 i":
double: 1
idouble: 1
Test "Real part of: cexp (0.75 + 1.25 i) == 0.667537446429131586942201977015932112 + 2.00900045494094876258347228145863909 i":
float: 1
ifloat: 1
Test "Imaginary part of: cexp (0.75 + 1.25 i) == 0.667537446429131586942201977015932112 + 2.00900045494094876258347228145863909 i":
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (11356.5625 + 0.75 i) == 9.052188470850960144814815984311663764287e4931 + 8.432986734191301036267148978260970230200e4931 i":
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (1440 + 0x1p-1074 i) == inf + 1.196295853897226111293303155636183216483e302 i plus overflow exception":
double: 1
idouble: 1
Test "Real part of: cexp (50 + 0x1p127 i) == 4.053997150228616856622417636046265337193e21 + 3.232070315463388524466674772633810238819e21 i":
double: 2
float: 1
@ -507,6 +519,24 @@ ldouble: 1
Test "Real part of: cexp (500 + 0x1p1023 i) == -1.159886268932754433233243794561351783426e217 + 7.904017694554466595359379965081774849708e216 i":
double: 1
idouble: 1
Test "Real part of: cexp (709.8125 + 0.75 i) == 1.355121963080879535248452862759108365762e308 + 1.262426823598609432507811340856186873507e308 i":
double: 1
idouble: 1
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (709.8125 + 0.75 i) == 1.355121963080879535248452862759108365762e308 + 1.262426823598609432507811340856186873507e308 i":
double: 1
idouble: 1
Test "Real part of: cexp (88.75 + 0.75 i) == 2.558360358486542817001900410314204322891e38 + 2.383359453227311447654736314679677655100e38 i":
float: 1
ifloat: 1
ildouble: 1
ldouble: 1
Test "Imaginary part of: cexp (88.75 + 0.75 i) == 2.558360358486542817001900410314204322891e38 + 2.383359453227311447654736314679677655100e38 i":
float: 2
ifloat: 2
ildouble: 1
ldouble: 1
# clog
Test "Imaginary part of: clog (-2 - 3 i) == 1.2824746787307683680267437207826593 - 2.1587989303424641704769327722648368 i":
@ -2115,9 +2145,9 @@ ldouble: 1
Function: Imaginary part of "cexp":
double: 1
float: 1
float: 2
idouble: 1
ifloat: 1
ifloat: 2
ildouble: 1
ldouble: 1