From: Ruinland ChuanTzu Tsai <ruinland@andestech.com>
To: <libc-alpha@sourceware.org>
Cc: <tesheng@andestech.com>
Subject: In libm, sin(qNaN) doesn't expect FE_INVALID ?
Date: Thu, 3 Sep 2020 20:34:42 +0800 [thread overview]
Message-ID: <20200903123442.GA5266@APC301.andestech.com> (raw)
Hi all,
sorry for the bothering.
Recently, as I'm testing some modification on libm, I happen to realize
the fact that glibc's testsutie doesn't expect sin(+-qNaN) to trigger
FE_INVALID, which is designed in `math/libm-test-sin.inc` :
TEST_f_f (sin, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED)
TEST_f_f (sin, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED)
Yet I think that if the program issued sin(qNaN), it should be okay to
be given an invalid operation excpetion.
If that's the case, then appending `INVALID_EXCEPTION_OK` to the
expected exception list of sin(qNaN) and sin(-qNaN) should be benign.
Though I'm neither an expert on libm nor IEEE standards, I'm wondering
will there be any concern of such behavior ( raising FE_INVALID on
sin(+-qNaN) ) ?
Sincerely,
Ruinland
next reply other threads:[~2020-09-03 12:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-03 12:34 Ruinland ChuanTzu Tsai [this message]
2020-09-03 13:19 ` Adhemerval Zanella
2020-09-03 17:03 ` Joseph Myers
2020-09-08 11:02 ` Ruinland ChuanTzu Tsai
2020-09-08 15:06 ` Joseph Myers
2020-09-10 13:49 ` Ruinland ChuanTzu Tsai
2020-09-10 15:26 ` Joseph Myers
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