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PowerPC: remove wrong nearbyintl implementation for PPC64

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The nearbyintl assembly implementation
(sysdeps/powerpc/powerpc64/fpu/s_nearbyintl.S)
returns wrong results for some inputs where first double is a exact
integer and the precision is determined by second long double.

Checking on implementation comments and history, I am very confident the
assembly implementation was based on a version before commit
5c68d40169 that fixes BZ#2423 (Errors in
long double (ldbl-128ibm) rounding functions in glibc-2.4).

By just removing the implementation and make the build select
sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c instead fixes the failing
math.

Fixes BZ#16706.
This commit is contained in:
Adhemerval Zanella
2014-03-14 12:27:52 -05:00
parent 374f7f6121
commit 98fb27a373
4 changed files with 18 additions and 114 deletions
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10
math/libm-test.inc
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@ -9520,6 +9520,16 @@ static const struct test_f_f_data nearbyint_test_data[] =
TEST_f_f (nearbyint, -281474976710656.75, -281474976710657.0, NO_INEXACT_EXCEPTION),
TEST_f_f (nearbyint, -562949953421312.75, -562949953421313.0, NO_INEXACT_EXCEPTION),
TEST_f_f (nearbyint, -1125899906842624.75, -1125899906842625.0, NO_INEXACT_EXCEPTION),
#endif
#ifdef TEST_LDOUBLE
/* Check cases where first double is a exact integer higher than 2^52 and
the precision is determined by second long double for IBM long double. */
TEST_f_f (nearbyint, 34503599627370498.515625L, 34503599627370499.0L),
TEST_f_f (nearbyint, -34503599627370498.515625L, -34503599627370499.0L),
# if LDBL_MANT_DIG >= 106
TEST_f_f (nearbyint, 1192568192774434123539907640624.484375L, 1192568192774434123539907640624.0L),
TEST_f_f (nearbyint, -1192568192774434123539907640624.484375L, -1192568192774434123539907640624.0L),
# endif
#endif
};