Messages in this thread | | | From | "Li, Xin3" <> | Subject | RE: [PATCH v3 3/6] x86/gsseg: make asm_load_gs_index() take an u16 | Date | Sat, 15 Oct 2022 00:13:47 +0000 |
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> > > > From: "H. Peter Anvin (Intel)" <hpa@zytor.com> > > > > Let gcc know that only the low 16 bits of load_gs_index() argument > > actually matter. It might allow it to create slightly better code. > > However, do not propagate this into the prototypes of functions that > > end up being paravirtualized, to avoid unnecessary changes. > > Using u16 will almost always make the code worse. > At some point the value has to be masked and/or extended to ensure an out of > range value doesn't appear in a register.
Any potential issue with this patch set?
> > David > > - > Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 > 1PT, UK Registration No: 1397386 (Wales)
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