[Fix] code review.

Author: link-xyq

llvm/lib/Target/RISCV/RISCVFeatures.td

@@ -1644,7 +1644,7 @@ def HasVendorXAndesVDot
 
 def FeatureVendorXSMTVDot
     : RISCVExtension<1, 0, "SpacemiT Vector Dot Product Extension",
-                     [FeatureStdExtV]>;
+                     [FeatureStdExtZve32f]>;
 def HasVendorXSMTVDot
     : Predicate<"Subtarget->hasVendorXSMTVDot()">,
       AssemblerPredicate<(all_of FeatureVendorXSMTVDot),

llvm/lib/Target/RISCV/RISCVInstrInfoXSMTVDot.td

@@ -7,6 +7,8 @@
 //===----------------------------------------------------------------------===//
 //
 // This file describes the xsmtvdot vendor extensions defined by SpacemiT.
+// NOTE: This extension instructions only support cases where LMUL is less than
+//       or equal to 1
 //
 //===----------------------------------------------------------------------===//
 

llvm/lib/Target/RISCV/RISCVRegisterInfo.td

@@ -787,7 +787,8 @@ def VR : VReg<!listconcat(VM1VTs, VMaskVTs),
 
 def VRNoV0 : VReg<!listconcat(VM1VTs, VMaskVTs), (sub VR, V0), 1>;
 
-def VREven : VReg<!listconcat(VM1VTs, VMaskVTs), (add (sequence "V%u", 0, 31, 2)), 1>;
+def VREven : VReg<!listconcat(VM1VTs, VMaskVTs),
+                  (add (sequence "V%u", 0, 30, 2)), 1>;
 
 def VRM2 : VReg<VM2VTs, (add (sequence "V%uM2", 8, 31, 2),
                              (sequence "V%uM2", 6, 0, 2)), 2>;