[RISCV] Use SplatPat/SplatPat_simm5 to handle PseudoVMV_V_X_/PseudoVMV_V_I_ selection as well.

This ensures that we'll match immediates consistently regardless
of whether we match them as a standalone splat or as part of
another operation.

While I was there I added complexities to the simm5/uimm5 patterns so
we didn't have to assume that the 1 on the non-immediate was lower
than what tablegen inferred.

I had to make a minor tweak to tablegen to fix one place that
didn't expect to see a ComplexPattern that wasn't a "leaf".

Reviewed By: frasercrmck

Differential Revision: https://reviews.llvm.org/D96199

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
index 394a0e1..0bfb695 100644
--- a/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/llvm/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -3472,6 +3472,9 @@ private:
     if (N->getNumChildren() != 1 || !N->getChild(0)->isLeaf())
       return false;
 
+    if (N->getOperator()->isSubClassOf("ComplexPattern"))
+      return false;
+
     const SDNodeInfo &OpInfo = CDP.getSDNodeInfo(N->getOperator());
     if (OpInfo.getNumResults() != 1 || OpInfo.getNumOperands() != 1)
       return false;