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Fix i386/x86_64 log10l (sNaN) (bug 20228).

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The i386/x86_64 versions of log10l return sNaN for sNaN input.  This
patch fixes them to add a NaN input to itself so that qNaN is returned
in this case.

Tested for x86_64 and x86.

	[BZ #20228]
	* sysdeps/i386/fpu/e_log10l.S (__ieee754_log10l): Add NaN input to
	itself.
	* sysdeps/x86_64/fpu/e_log10l.S (__ieee754_log10l): Likewise.
	* math/libm-test.inc (log10_test_data): Add sNaN tests.
This commit is contained in:
Joseph Myers 2016-06-08 22:59:18 +00:00
parent df179d8808
commit 09096b3615
4 changed files with 10 additions and 0 deletions
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6
ChangeLog
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@ -1,5 +1,11 @@
2016-06-08 Joseph Myers <joseph@codesourcery.com>
[BZ #20228]
* sysdeps/i386/fpu/e_log10l.S (__ieee754_log10l): Add NaN input to
itself.
* sysdeps/x86_64/fpu/e_log10l.S (__ieee754_log10l): Likewise.
* math/libm-test.inc (log10_test_data): Add sNaN tests.
[BZ #20227]
* sysdeps/i386/fpu/e_logl.S (__ieee754_logl): Add NaN input to
itself.

2
math/libm-test.inc
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@ -9026,6 +9026,8 @@ static const struct test_f_f_data log10_test_data[] =
TEST_f_f (log10, plus_infty, plus_infty, ERRNO_UNCHANGED),
TEST_f_f (log10, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_f_f (log10, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_f_f (log10, snan_value, qnan_value, INVALID_EXCEPTION),
TEST_f_f (log10, -snan_value, qnan_value, INVALID_EXCEPTION),
AUTO_TESTS_f_f (log10),
};

1
sysdeps/i386/fpu/e_log10l.S
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@ -65,6 +65,7 @@ ENTRY(__ieee754_log10l)
3: jp 4b // in case x is ±Inf
fstp %st(1)
fstp %st(1)
fadd %st(0)
ret
END(__ieee754_log10l)
strong_alias (__ieee754_log10l, __log10l_finite)

1
sysdeps/x86_64/fpu/e_log10l.S
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@ -64,6 +64,7 @@ ENTRY(__ieee754_log10l)
jnz 4b // in case x is ±Inf
fstp %st(1)
fstp %st(1)
fadd %st(0)
ret
END(__ieee754_log10l)