CVS commit: src/sys/arch/riscv/include

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Tue May 14 15:17:57 UTC 2024

Modified Files:
        src/sys/arch/riscv/include: sysreg.h

Log Message:
riscv: No volatile needed on asm to _read_ rounding mode, exceptions.

These instructions can be omitted if the return values are unused.
In contrast, _writes_ to the rounding mode or exceptions must not be
omitted (even if we ignore the return value, which is the old value
of the field).

I think "memory" is the wrong clobber on these asm blocks too; they
can't be reordered around _floating-point_ instructions, while
reordering around loads and stores is fine.  But I don't know how to
spell the right thing in gcclish.


To generate a diff of this commit:
cvs rdiff -u -r1.32 -r1.33 src/sys/arch/riscv/include/sysreg.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.