> grep -P "(\t )|( \t)" src/hotspot/cpu/riscv/riscv.ad
reg_def V1 ( SOC, SOC, Op_VecA, 1, v1->as_VMReg() );
reg_def V5 ( SOC, SOC, Op_VecA, 5, v5->as_VMReg() );
reg_def V7 ( SOC, SOC, Op_VecA, 7, v7->as_VMReg() );