tree 89344c8daadb77dd726a388cb6fadab1e3eb8b1b
parent bec508ad1719dfc8f0d85c5343ce44c3d1f326e1
author Craig Topper <craig.topper@sifive.com> 1752616194 -0700
committer GitHub <noreply@github.com> 1752616194 -0700
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[RISCV] Change the InstFormat for Zicbop prefetch instructions to InstFormatOther. (#148934)

The lower 5-bits of the immediate are not part of the address unlike
other InstFormatS instructions.

We use InstFormatS in RISCVRegisterInfo::needsFrameBaseReg and
RISCVRegisterInfo::getFrameIndexInstrOffset which is not aware of this
special encoding. Force the format to InstFormatOther so those functions
will ignore it.

InstFormatS is also used by relocation emission, but I don't believe we
ever emit these instructions with a relocation because of the encoding.