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9438b237ab
glibc/sysdeps/i386
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Joseph Myers 9438b237ab Fix x86/x86_64 scalb (qNaN, -Inf) (bug 16783). 
Various x86 / x86_64 versions of scalb / scalbf / scalbl produce
spurious "invalid" exceptions for (qNaN, -Inf) arguments, because this
is wrongly handled like (+/-Inf, -Inf) which *should* raise such an
exception.  (In fact the NaN case of the code determining whether to
quietly return a zero or a NaN for second argument -Inf was
accidentally dead since the code had been made to return a NaN with
exception.)  This patch fixes the code to do the proper test for an
infinity as distinct from a NaN.

(Since the existing code does nothing to distinguish qNaNs and sNaNs
here, this patch doesn't either.  If in future we systematically
implement proper sNaN semantics following TS 18661-1:2014, there will
be lots of bugs to address - Thomas found lots of issues with his
patch <https://sourceware.org/ml/libc-ports/2013-04/msg00008.html> to
add SNaN tests (which never went in and would now require significant
reworking).)

Tested for x86_64 and x86.  Committed.

	[BZ #16783]
	* sysdeps/i386/fpu/e_scalb.S (__ieee754_scalb): Do not handle
	arguments (NaN, -Inf) the same as (+/-Inf, -Inf).
	* sysdeps/i386/fpu/e_scalbf.S (__ieee754_scalbf): Likewise.
	* sysdeps/i386/fpu/e_scalbl.S (__ieee754_scalbl): Likewise.
	* sysdeps/x86_64/fpu/e_scalbl.S (__ieee754_scalbl): Likewise.
	* math/libm-test.inc (scalb_test_data): Add more tests.
2015-02-24 17:30:02 +00:00
..
fpu Fix x86/x86_64 scalb (qNaN, -Inf) (bug 16783). 2015-02-24 17:30:02 +00:00
i486 Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
i586 Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
i686 Fix __memcpy_chk on non-SSE2 CPUs 2015-02-10 21:39:06 +10:00
i786
nptl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
sys Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
____longjmp_chk.S
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abort-instr.h
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Makefile Clean up sysdep-dl-routines variable. 2015-02-06 10:42:08 -08:00
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tls-macros.h i386: Fix build by GCC 5.0 2014-12-30 11:37:41 -08:00
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tlsdesc.sym
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