[RISCV] Use uint64_t countTrailingZeros/Ones instead of APInt. NFC

We know the type is 32 or 64 bits, we can use getZExtValue and
bypass the slow path check in APInt.

diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.td b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
index ab68210..4a1acd5 100644 (file)
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -431,13 +431,13 @@ def AddiPairImmLarge : SDNodeXForm<imm, [{
 }]>;
 
 def TrailingZeros : SDNodeXForm<imm, [{
-  return CurDAG->getTargetConstant(N->getAPIntValue().countTrailingZeros(),
+  return CurDAG->getTargetConstant(countTrailingZeros(N->getZExtValue()),
                                    SDLoc(N), N->getValueType(0));
 }]>;
 
 def XLenSubTrailingOnes : SDNodeXForm<imm, [{
   uint64_t XLen = Subtarget->getXLen();
-  uint64_t TrailingOnes = N->getAPIntValue().countTrailingOnes();
+  uint64_t TrailingOnes = countTrailingOnes(N->getZExtValue());
   return CurDAG->getTargetConstant(XLen - TrailingOnes, SDLoc(N),
                                    N->getValueType(0));
 }]>;