The default promotion uses zero extends that become shifts. We
cam use sign extend instead which is better for RISCV.
I've used two different implementations based on whether we
have minu/maxu instructions.
Differential Revision: https://reviews.llvm.org/D98683
The result of ISD::USUBSAT will never be larger than the LHS. We
can use this to put a bound on the number of leading zeros.
Reviewed By: RKSimon
Differential Revision: https://reviews.llvm.org/D98133
A setcc can be created during LegalizeDAG after select_cc has been
created. This combine will enable us to fold these late setccs.
Reviewed By: luismarques
Differential Revision: https://reviews.llvm.org/D98132
Craig Topper