FBT_REG_L3
*tinstr++ = FBT_SETHI(base, FBT_REG_L3);
*tinstr++ = FBT_ORLO(FBT_REG_L3, base, FBT_REG_L3);
*tinstr++ = FBT_CMP(FBT_REG_L2, FBT_REG_L3);
*tinstr++ = FBT_SETHI(limit, FBT_REG_L3);
*tinstr++ = FBT_ORLO(FBT_REG_L3, limit, FBT_REG_L3);
*tinstr++ = FBT_CMP(FBT_REG_L2, FBT_REG_L3);