8355878: RISC-V: jdk/incubator/vector/DoubleMaxVectorTests.java fails when using RVV

Reviewed-by: fyang, dzhang

Author: zifeihan

src/hotspot/cpu/riscv/riscv.ad

@@ -1596,7 +1596,8 @@ uint MachSpillCopyNode::implementation(C2_MacroAssembler *masm, PhaseRegAlloc *r
         __ unspill(as_VectorRegister(Matcher::_regEncode[dst_lo]), ra_->reg2offset(src_lo));
       } else if (src_lo_rc == rc_vector && dst_lo_rc == rc_vector) {
         // vpr to vpr
-        __ vmv1r_v(as_VectorRegister(Matcher::_regEncode[dst_lo]), as_VectorRegister(Matcher::_regEncode[src_lo]));
+        __ vsetvli_helper(T_BYTE, MaxVectorSize);
+        __ vmv_v_v(as_VectorRegister(Matcher::_regEncode[dst_lo]), as_VectorRegister(Matcher::_regEncode[src_lo]));
       } else {
         ShouldNotReachHere();
       }
@@ -1614,7 +1615,8 @@ uint MachSpillCopyNode::implementation(C2_MacroAssembler *masm, PhaseRegAlloc *r
         __ unspill_vmask(as_VectorRegister(Matcher::_regEncode[dst_lo]), ra_->reg2offset(src_lo));
       } else if (src_lo_rc == rc_vector && dst_lo_rc == rc_vector) {
         // vmask to vmask
-        __ vmv1r_v(as_VectorRegister(Matcher::_regEncode[dst_lo]), as_VectorRegister(Matcher::_regEncode[src_lo]));
+        __ vsetvli_helper(T_BYTE, MaxVectorSize >> 3);
+        __ vmv_v_v(as_VectorRegister(Matcher::_regEncode[dst_lo]), as_VectorRegister(Matcher::_regEncode[src_lo]));
       } else {
         ShouldNotReachHere();
       }