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Fix ldbl-128/ldbl-128ibm lgamma spurious "invalid", incorrect signgam (bug 18952).

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The ldbl-128 / ldbl-128ibm implementation of lgammal converts (the
floor of minus) non-integer negative arguments to int to determine the
value of signgam.  When those values are outside the range of int,
this produces spurious "invalid" exceptions and incorrect values of
signgam.  This patch fixes this by instead determining signgam through
comparing half the integer in question to floor of half the integer.

Tested for mips64, x86_64 and x86.

	[BZ #18952]
	* sysdeps/ieee754/ldbl-128/e_lgammal_r.c (__ieee754_lgammal_r): Do
	not convert non-integer negative arguments to int to determine the
	value of signgam.
	* math/auto-libm-test-in: Add more tests of lgamma.
	* math/auto-libm-test-out: Regenerated.
This commit is contained in:
Joseph Myers 2015-09-11 15:34:25 +00:00
parent 00a7073c38
commit 9bb69b60fa
5 changed files with 55 additions and 3 deletions
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7
ChangeLog
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@ -1,5 +1,12 @@
2015-09-11 Joseph Myers <joseph@codesourcery.com>
[BZ #18952]
* sysdeps/ieee754/ldbl-128/e_lgammal_r.c (__ieee754_lgammal_r): Do
not convert non-integer negative arguments to int to determine the
value of signgam.
* math/auto-libm-test-in: Add more tests of lgamma.
* math/auto-libm-test-out: Regenerated.
* math/auto-libm-test-in: Add more tests of acosh, atanh, cbrt,
cosh, csqrt, erfc, expm1 and lgamma.
* math/auto-libm-test-out: Regenerated.

2
NEWS
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@ -13,7 +13,7 @@ Version 2.23
16973, 17787, 17905, 18084, 18086, 18240, 18265, 18370, 18421, 18480,
18525, 18610, 18618, 18647, 18661, 18674, 18675, 18681, 18757, 18778,
18781, 18787, 18789, 18790, 18795, 18796, 18820, 18823, 18824, 18863,
18870, 18873, 18887, 18921.
18870, 18873, 18887, 18921, 18952.
* The obsolete header <regexp.h> has been removed. Programs that require
this header must be updated to use <regex.h> instead.

3
math/auto-libm-test-in
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@ -2047,6 +2047,9 @@ lgamma -0xffffffffffffffffp-1
lgamma -0x3ffffffffffffffffffffffffffp-1
lgamma -0x1ffffffffffffffffffffffffffffp-1
lgamma -0x100000000.8p0
lgamma -0x100000001.8p0
lgamma -0.25
lgamma -0.5
lgamma -0.75

42
math/auto-libm-test-out
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@ -153351,6 +153351,48 @@ lgamma -0x1ffffffffffffffffffffffffffffp-1
= lgamma tonearest ldbl-128 -0xf.fffffffffffffffffffffffffff8p+108L : -0x4.ca1ea7c6bcac53b28539e9281ba4p+116L 1 : inexact-ok
= lgamma towardzero ldbl-128 -0xf.fffffffffffffffffffffffffff8p+108L : -0x4.ca1ea7c6bcac53b28539e9281ba4p+116L 1 : inexact-ok
= lgamma upward ldbl-128 -0xf.fffffffffffffffffffffffffff8p+108L : -0x4.ca1ea7c6bcac53b28539e9281ba4p+116L 1 : inexact-ok
lgamma -0x100000000.8p0
= lgamma downward dbl-64 -0x1.000000008p+32 : -0x1.52e42ff102e65p+36 -1 : inexact-ok
= lgamma tonearest dbl-64 -0x1.000000008p+32 : -0x1.52e42ff102e65p+36 -1 : inexact-ok
= lgamma towardzero dbl-64 -0x1.000000008p+32 : -0x1.52e42ff102e64p+36 -1 : inexact-ok
= lgamma upward dbl-64 -0x1.000000008p+32 : -0x1.52e42ff102e64p+36 -1 : inexact-ok
= lgamma downward ldbl-96-intel -0x1.000000008p+32L : -0x1.52e42ff102e64be4p+36L -1 : inexact-ok
= lgamma tonearest ldbl-96-intel -0x1.000000008p+32L : -0x1.52e42ff102e64be2p+36L -1 : inexact-ok
= lgamma towardzero ldbl-96-intel -0x1.000000008p+32L : -0x1.52e42ff102e64be2p+36L -1 : inexact-ok
= lgamma upward ldbl-96-intel -0x1.000000008p+32L : -0x1.52e42ff102e64be2p+36L -1 : inexact-ok
= lgamma downward ldbl-96-m68k -0x1.000000008p+32L : -0x1.52e42ff102e64be4p+36L -1 : inexact-ok
= lgamma tonearest ldbl-96-m68k -0x1.000000008p+32L : -0x1.52e42ff102e64be2p+36L -1 : inexact-ok
= lgamma towardzero ldbl-96-m68k -0x1.000000008p+32L : -0x1.52e42ff102e64be2p+36L -1 : inexact-ok
= lgamma upward ldbl-96-m68k -0x1.000000008p+32L : -0x1.52e42ff102e64be2p+36L -1 : inexact-ok
= lgamma downward ldbl-128 -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d246256p+36L -1 : inexact-ok
= lgamma tonearest ldbl-128 -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d246255p+36L -1 : inexact-ok
= lgamma towardzero ldbl-128 -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d246255p+36L -1 : inexact-ok
= lgamma upward ldbl-128 -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d246255p+36L -1 : inexact-ok
= lgamma downward ldbl-128ibm -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d24628p+36L -1 : inexact-ok
= lgamma tonearest ldbl-128ibm -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d24628p+36L -1 : inexact-ok
= lgamma towardzero ldbl-128ibm -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d2462p+36L -1 : inexact-ok
= lgamma upward ldbl-128ibm -0x1.000000008p+32L : -0x1.52e42ff102e64be289794d2462p+36L -1 : inexact-ok
lgamma -0x100000001.8p0
= lgamma downward dbl-64 -0x1.000000018p+32 : -0x1.52e42ff265ca8p+36 1 : inexact-ok
= lgamma tonearest dbl-64 -0x1.000000018p+32 : -0x1.52e42ff265ca8p+36 1 : inexact-ok
= lgamma towardzero dbl-64 -0x1.000000018p+32 : -0x1.52e42ff265ca7p+36 1 : inexact-ok
= lgamma upward dbl-64 -0x1.000000018p+32 : -0x1.52e42ff265ca7p+36 1 : inexact-ok
= lgamma downward ldbl-96-intel -0x1.000000018p+32L : -0x1.52e42ff265ca7bd4p+36L 1 : inexact-ok
= lgamma tonearest ldbl-96-intel -0x1.000000018p+32L : -0x1.52e42ff265ca7bd2p+36L 1 : inexact-ok
= lgamma towardzero ldbl-96-intel -0x1.000000018p+32L : -0x1.52e42ff265ca7bd2p+36L 1 : inexact-ok
= lgamma upward ldbl-96-intel -0x1.000000018p+32L : -0x1.52e42ff265ca7bd2p+36L 1 : inexact-ok
= lgamma downward ldbl-96-m68k -0x1.000000018p+32L : -0x1.52e42ff265ca7bd4p+36L 1 : inexact-ok
= lgamma tonearest ldbl-96-m68k -0x1.000000018p+32L : -0x1.52e42ff265ca7bd2p+36L 1 : inexact-ok
= lgamma towardzero ldbl-96-m68k -0x1.000000018p+32L : -0x1.52e42ff265ca7bd2p+36L 1 : inexact-ok
= lgamma upward ldbl-96-m68k -0x1.000000018p+32L : -0x1.52e42ff265ca7bd2p+36L 1 : inexact-ok
= lgamma downward ldbl-128 -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be41dp+36L 1 : inexact-ok
= lgamma tonearest ldbl-128 -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be41dp+36L 1 : inexact-ok
= lgamma towardzero ldbl-128 -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be41cp+36L 1 : inexact-ok
= lgamma upward ldbl-128 -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be41cp+36L 1 : inexact-ok
= lgamma downward ldbl-128ibm -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be48p+36L 1 : inexact-ok
= lgamma tonearest ldbl-128ibm -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be4p+36L 1 : inexact-ok
= lgamma towardzero ldbl-128ibm -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be4p+36L 1 : inexact-ok
= lgamma upward ldbl-128ibm -0x1.000000018p+32L : -0x1.52e42ff265ca7bd24518407be4p+36L 1 : inexact-ok
lgamma -0.25
= lgamma downward flt-32 -0x4p-4f : 0x1.96ee68p+0f -1 : inexact-ok
= lgamma tonearest flt-32 -0x4p-4f : 0x1.96ee68p+0f -1 : inexact-ok

4
sysdeps/ieee754/ldbl-128/e_lgammal_r.c
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@ -787,8 +787,8 @@ __ieee754_lgammal_r (long double x, int *signgamp)
p = __floorl (q);
if (p == q)
return (one / (p - p));
i = p;
if ((i & 1) == 0)
long double halfp = p * 0.5L;
if (halfp == __floorl (halfp))
*signgamp = -1;
else
*signgamp = 1;