Commit 6c212a8b78
("Fix strtod ("nan") and strtold ("nan") returns wrong negative NaN")
introduced an unconditional dependency to nanl and, in turn, to libm.
Rather than including nanl in libc as well, just call __builtin_nanl
from here. Requires GCC 3.3 or later.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
By previous commit, strto{d|ld} ("nan")
does not use the definition of NaN.
There is no other function that uses the definitions.
This commit remove the definitions.
The definition of qNaN for x86_64 and i386 was wrong.
strto{d|ld} ("nan") returned wrong negative NaN
instead of correct positive NaN
since it used the wrong definition.
On the other hand, strtof ("nan") returns correct positive NaN
since it uses nanf ("") instead of the wrong definition.
This commit makes strto{d|ld} ("nan") uses {nan|nanl} ("")
like strtof ("nan") using.
So strto{d|ld} ("nan") returns positive NaN.
Infinity returned from strtold is recognized as NaN by GCC builtin
functions. The reason is that ULtox is missing to set a bit.
* libc/stdlib/strtorx.c (ULtox): Set high bit in second word
to create valid Infinity value.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Corinna Vinschen
Masamichi Hosoda
Steve Ellcey