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Fix ldbl-128ibm hypotl inaccuracy for arguments with large ratio (bug 14868).

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This commit is contained in:
Joseph Myers 2012-11-22 14:57:22 +00:00
parent c9c0279bcb
commit 8e27e3cc45
4 changed files with 9 additions and 2 deletions
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5
ChangeLog
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@ -1,5 +1,10 @@
2012-11-22 Joseph Myers <joseph@codesourcery.com>
[BZ #14868]
* sysdeps/ieee754/ldbl-128ibm/e_hypotl.c (__ieee754_hypotl):
Return a+b for ratio over 2**120, not 2**60.
* math/libm-test.inc (hypot_test): Add another test.
* math/libm-test.inc (clog_test): Use
UNDERFLOW_EXCEPTION_LDOUBLE_IBM on two tests.
(clog10_test): Likewise.

2
NEWS
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@ -21,7 +21,7 @@ Version 2.17
14638, 14645, 14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694,
14716, 14719, 14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797,
14801, 14805, 14807, 14809, 14811, 14815, 14821, 14822, 14824, 14828,
14831, 14835, 14838, 14856, 14863, 14865, 14866.
14831, 14835, 14838, 14856, 14863, 14865, 14866, 14868.
* Port to ARM AArch64 contributed by Linaro.

2
math/libm-test.inc
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@ -5730,6 +5730,8 @@ hypot_test (void)
TEST_ff_f (hypot, 0.75L, 1.25L, 1.45773797371132511771853821938639577L);
TEST_ff_f (hypot, 1.0L, 0x1p-61L, 1.0L);
#if !(defined TEST_FLOAT && defined TEST_INLINE)
TEST_ff_f (hypot, 0x3p125L, 0x4p125L, 0x5p125L);
TEST_ff_f (hypot, 0x1.234566p-126L, 0x1.234566p-126L, 1.891441686191081936598531534017449451173e-38L);

2
sysdeps/ieee754/ldbl-128ibm/e_hypotl.c
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@ -61,7 +61,7 @@ __ieee754_hypotl(long double x, long double y)
if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
a = fabsl(a); /* a <- |a| */
b = fabsl(b); /* b <- |b| */
if((ha-hb)>0x3c0000000000000LL) {return a+b;} /* x/y > 2**60 */
if((ha-hb)>0x780000000000000LL) {return a+b;} /* x/y > 2**120 */
k=0;
kld = 1.0L;
if(ha > 0x5f30000000000000LL) { /* a>2**500 */