chill added inline comments.
================
Comment at: llvm/lib/Target/AArch64/AArch64InstrInfo.td:849-857
+// These pointer authentication instructions require armv8.3a
+let Predicates = [HasV8_3a, HasPA] in {
let Uses = [LR], Defs = [LR] in {
def PACIAZ : SystemNoOperands<0b000, "hint\t#24">;
def PACIBZ : SystemNoOperands<0b010, "hint\t#26">;
let isAuthenticated = 1 in {
def AUTIAZ : SystemNoOperands<0b100, "hint\t#28">;
----------------
wxz2020 wrote:
> wxz2020 wrote:
> > ktkachov wrote:
> > > IIRC these instructions are deliberately allowed in pre-armv8.3 targets
> > > because they are encoded in the NOP-space and can be deployed on
> > > pre-armv8.3 targets
> > I will do some research on this.
> According to the documents, pointer authenticatoin got officially supporoted
> starting from armv8.3.
These instructions are executed as NOP on pre v8.3-A architectures. It allows
you to have a single compatible binary that works correctly on pre v8.3-a (ofc,
without pointer authentication), as well as on
8.3-a and later cores, with pointer authentication.
Please, remove the predicates.
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D78129/new/
https://reviews.llvm.org/D78129
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