[RISCV] Check the extension type for atomic loads in isel patterns. (#137019)

Previously we ignored the extension type and only used the memory type.
The extension type on RISC-V today can only be nonextload, extload, or
sextload. It is ok to treat extload as the same as sextload so ignoring
the extension type is fine.

For #136502, we want to support zextload as well so we will need to
disambiguate based on the extension type.

I wanted to use IsAtomic/IsZeroExtLoad/IsSignExtLoad/IsAnyExtLoad flags
from PatFrags to autogenerate the predicates, but those aren't hooked up
properly in tablegen for ISD::ATOMIC_LOAD. Fixing that will impact other
targets as almost all of them also ignore the extension type.

0 files changed, 0 insertions, 0 deletions