is that `fsgnjn.s` will affect other bits except sign bit.

I am using fsgnjn.s to implement fneg. But I have problem with this.

I am using.

yuyang@yuyang-vmwarevirtualplatform:~$ qemu-riscv64  --version
qemu-riscv64 version 6.2.0 (Debian 1:6.2+dfsg-2ubuntu6.3)
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers

Edited Aug 25, 2022 by yang yu

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