Fix ldbl-128 cos range reduction near pi/2 (bug 15429).
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2013-05-09 Joseph Myers <joseph@codesourcery.com>
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[BZ #15429]
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* sysdeps/ieee754/ldbl-128/e_rem_pio2l.c (c): Use 113 bits for
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high part of pi/2.
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(__ieee754_rem_pio2l): Update comments.
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* math/libm-test.inc (M_SQRT_2_2): Remove macro.
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(csqrt_test): Use M_SQRT1_2l instead of M_SQRT_2_2.
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2
NEWS
2
NEWS
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@ -16,7 +16,7 @@ Version 2.18
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15062, 15078, 15084, 15085, 15086, 15160, 15214, 15221, 15232, 15234,
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15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
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15336, 15337, 15342, 15346, 15361, 15366, 15380, 15394, 15405, 15406,
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15409, 15416, 15418, 15419, 15423, 15426.
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15409, 15416, 15418, 15419, 15423, 15426, 15429.
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* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
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#15078).
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@ -184,13 +184,13 @@ static const int32_t two_over_pi[] = {
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};
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static const long double c[] = {
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/* 93 bits of pi/2 */
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/* 113 bits of pi/2 */
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#define PI_2_1 c[0]
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1.57079632679489661923132169155131424e+00L, /* 3fff921fb54442d18469898cc5100000 */
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0x1.921fb54442d18469898cc51701b8p+0L,
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/* pi/2 - PI_2_1 */
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#define PI_2_1t c[1]
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8.84372056613570112025531863263659260e-29L, /* 3fa1c06e0e68948127044533e63a0106 */
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0x3.9a252049c1114cf98e804177d4c8p-116L,
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};
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int32_t __ieee754_rem_pio2l(long double x, long double *y)
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@ -213,7 +213,7 @@ int32_t __ieee754_rem_pio2l(long double x, long double *y)
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{
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if (hx > 0)
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{
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/* 113 + 93 bit PI is ok */
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/* 113 + 113 bit PI is ok */
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z = x - PI_2_1;
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y[0] = z - PI_2_1t;
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y[1] = (z - y[0]) - PI_2_1t;
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@ -221,7 +221,7 @@ int32_t __ieee754_rem_pio2l(long double x, long double *y)
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}
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else
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{
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/* 113 + 93 bit PI is ok */
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/* 113 + 113 bit PI is ok */
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z = x + PI_2_1;
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y[0] = z + PI_2_1t;
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y[1] = (z - y[0]) + PI_2_1t;
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