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Fix accuracy problem in generic sin

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This commit is contained in:
Ulrich Drepper 2011-10-29 14:08:56 -04:00
parent 09e1869773
commit cb95113e30
4 changed files with 13 additions and 5 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2011-07-03 Andreas Jaeger <aj@suse.de>
[BZ #10709]
* sysdeps/ieee754/dbl-64/s_sin.c (__sin): Fix incorrect rounding
of sin. Patch suggested by Paul Zimmermann <zimmerma+gcc@loria.fr>.
* math/libm-test.inc (sin_test): Add test case.
2011-10-29 Ulrich Drepper <drepper@gmail.com>
[BZ #13337]

8
NEWS
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@ -9,10 +9,10 @@ Version 2.15
* The following bugs are resolved with this release:
6779, 6783, 9696, 11589, 12403, 12847, 12868, 12852, 12874, 12885, 12892,
12907, 12922, 12935, 13007, 13021, 13067, 13068, 13090, 13092, 13114,
13118, 13123, 13134, 13138, 13150, 13179, 13192, 13268, 13291, 13335,
13337, 13344
6779, 6783, 9696, 10709, 11589, 12403, 12847, 12868, 12852, 12874, 12885,
12892, 12907, 12922, 12935, 13007, 13021, 13067, 13068, 13090, 13092,
13114, 13118, 13123, 13134, 13138, 13150, 13179, 13192, 13268, 13291,
13335, 13337, 13344
* New program pldd to list loaded object of a process
Implemented by Ulrich Drepper.

1
math/libm-test.inc
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@ -5642,6 +5642,7 @@ sin_test (void)
#ifdef TEST_DOUBLE
TEST_f_f (sin, 0.80190127184058835, 0.71867942238767868);
TEST_f_f (sin, 2.522464e-1, 2.4957989804940911e-1);
#endif
END (sin);

2
sysdeps/ieee754/dbl-64/s_sin.c
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@ -138,7 +138,7 @@ __sin(double x){
cor=(ssn+s*ccs-sn*c)+cs*s;
res=sn+cor;
cor=(sn-res)+cor;
return (res==res+1.025*cor)? res : slow1(x);
return (res==res+1.096*cor)? res : slow1(x);
} /* else if (k < 0x3feb6000) */
/*----------------------- 0.855469 <|x|<2.426265 ----------------------*/