1package xiangshan.backend.fu 2 3object VsetRef{ 4 def VLEN: Int = 128 5 def XLEN: Int = 64 6 def ELEN: Int = 64 7 def isKeepVL(func: Int): Boolean = (func >> 1 & 1) == 1 8 def isSetVlmax(func: Int): Boolean = (func & 1) == 1 9 def isVsetivli(func: Int): Boolean = (func & 0xc0) == 0 10 def isVsetvl(func: Int): Boolean = (func >> 6 & 1) == 1 11 12 def test(avlPre: Int, vsew: Int, vlmul: Int, vta: Boolean, vma: Boolean, villPre: Boolean, func: Int, oldVL: Int) = { 13 val avl = if(this.isVsetivli(func)) avlPre & 0x1f else avlPre 14 val vill = if(this.isVsetvl(func)) villPre else false 15 println("[REF] --- avl：" + avl + " vsew:" + vsew + " vlmul:" + vlmul + " vta:" + vta + " vma:" + vma + " vill:" + vill + " func:" + func.toBinaryString + " oldVL:" + oldVL) 16 val isKeepVl = this.isKeepVL(func) 17 val isSetVlmax = this.isSetVlmax(func) 18 val isVsetivli = this.isVsetivli(func) 19 20 val vsewValue = 1 << vsew + 3 21 val vflmul: Double = if ((vlmul & 0x4) == 0) 1 << vlmul else 1.0 / (1 << ((vlmul ^ 0x7) + 1)) 22 val vlmax = (VLEN/vsewValue) * vflmul 23 24 println("[REF] --- vsewValue: " + vsewValue + " vflmul: " + vflmul + " vlmax: " + vlmax) 25 26 val villegal = !(vflmul >= 0.125 && vflmul <= 8) || vsewValue > (vflmul min 1.0f) * ELEN || vill 27 28 // set vl 29 val vl = if(isVsetivli) { 30 if(avl > vlmax) vlmax else avl 31 }else if (isKeepVl) { 32 oldVL 33 } else if (isSetVlmax) { 34 vlmax 35 } else { 36 if(avl > vlmax) vlmax else avl 37 } 38 if (villegal) { 39 (0, true, false, false, 0, 0) 40 }else{ 41 (vl.toInt, villegal, vta, vma, vsew, vlmul) 42 } 43 } 44 45} 46