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Make LoadGen and StoreGen generic

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This commit is contained in:
Andrew Waterman 2015-11-24 18:12:11 -08:00
parent ee6514e4f4
commit 57e82442a1
1 changed files with 41 additions and 69 deletions
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108
uncore/src/main/scala/amoalu.scala
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@ -4,79 +4,50 @@ package uncore
import Chisel._
import cde.{Parameters, Field}
abstract class StoreGen(typ: UInt, addr: UInt, dat: UInt) {
val byte = typ === MT_B || typ === MT_BU
val half = typ === MT_H || typ === MT_HU
val word = typ === MT_W || typ === MT_WU
class StoreGen(typ: UInt, addr: UInt, dat: UInt, maxSize: Int) {
val size = typ(log2Up(log2Up(maxSize)+1)-1,0)
def misaligned =
(addr & ((UInt(1) << size) - UInt(1))(log2Up(maxSize)-1,0)).orR
def mask: UInt
def data: UInt
def wordData: UInt
def mask = {
var res = UInt(1)
for (i <- 0 until log2Up(maxSize)) {
val upper = Mux(addr(i), res, UInt(0)) | Mux(size >= UInt(i+1), UInt((BigInt(1) << (1 << i))-1), UInt(0))
val lower = Mux(addr(i), UInt(0), res)
res = Cat(upper, lower)
}
res
}
protected def genData(i: Int): UInt =
if (i >= log2Up(maxSize)) dat
else Mux(size === UInt(i), Fill(1 << (log2Up(maxSize)-i), dat((8 << i)-1,0)), genData(i+1))
def data = genData(0)
def wordData = genData(2)
}
class StoreGen64(typ: UInt, addr: UInt, dat: UInt) extends StoreGen(typ, addr, dat) {
def mask =
Mux(byte, Bits( 1) << addr(2,0),
Mux(half, Bits( 3) << Cat(addr(2,1), Bits(0,1)),
Mux(word, Bits( 15) << Cat(addr(2), Bits(0,2)),
Bits(255))))
def data =
Mux(byte, Fill(8, dat( 7,0)),
Mux(half, Fill(4, dat(15,0)),
wordData))
def wordData =
Mux(word, Fill(2, dat(31,0)),
dat)
class StoreGenAligned(typ: UInt, addr: UInt, dat: UInt, maxSize: Int) extends StoreGen(typ, addr, dat, maxSize) {
override def genData(i: Int) = dat
}
class StoreGenAligned64(typ: UInt, addr: UInt, dat: UInt) extends StoreGen64(typ, addr, dat) {
override def data = dat
override def wordData = dat
}
class LoadGen(typ: UInt, addr: UInt, dat: UInt, zero: Bool, maxSize: Int) {
private val t = new StoreGen(typ, addr, dat, maxSize)
private val signed = typ.toSInt >= SInt(0)
class StoreGen32(typ: UInt, addr: UInt, dat: UInt) extends StoreGen(typ, addr, dat){
override val word = typ === MT_W
private def genData(logMinSize: Int): UInt = {
var res = dat
for (i <- log2Up(maxSize)-1 to logMinSize by -1) {
val pos = 8 << i
val shifted = Mux(addr(i), res(2*pos-1,pos), res(pos-1,0))
val zeroed = if (i > 0) shifted else Mux(zero, UInt(0), shifted)
res = Cat(Mux(t.size === UInt(i), Fill(8*maxSize-pos, signed && zeroed(pos-1)), res(8*maxSize-1,pos)), zeroed)
}
res
}
def mask =
Mux(byte, Bits( 1) << addr(2,0),
Mux(half, Bits( 3) << Cat(addr(2,1), Bits(0,1)),
Bits( 15)))
def data =
Mux(byte, Fill(4, dat( 7,0)),
Mux(half, Fill(2, dat(15,0)),
wordData))
def wordData = dat
def size =
Mux(byte, UInt("b000"),
Mux(half, UInt("b001"),
UInt("b010")))
}
class LoadGen64(typ: UInt, addr: UInt, dat: UInt, zero: Bool) {
val t = new StoreGen64(typ, addr, dat)
val sign = typ === MT_B || typ === MT_H || typ === MT_W || typ === MT_D
val wordShift = Mux(addr(2), dat(63,32), dat(31,0))
val word = Cat(Mux(t.word, Fill(32, sign && wordShift(31)), dat(63,32)), wordShift)
val halfShift = Mux(addr(1), word(31,16), word(15,0))
val half = Cat(Mux(t.half, Fill(48, sign && halfShift(15)), word(63,16)), halfShift)
val byteShift = Mux(zero, UInt(0), Mux(addr(0), half(15,8), half(7,0)))
val byte = Cat(Mux(zero || t.byte, Fill(56, sign && byteShift(7)), half(63,8)), byteShift)
}
class LoadGen32(typ: UInt, addr: UInt, dat: UInt) {
val t = new StoreGen32(typ, addr, dat)
val sign = typ === MT_B || typ === MT_H || typ === MT_W
val word = dat
val halfShift = Mux(addr(1), word(31,16), word(15,0))
val half = Cat(Mux(t.half, Fill(16, sign && halfShift(15)), word(31,16)), halfShift)
val byteShift = Mux(addr(0), half(15,8), half(7,0))
val byte = Cat(Mux(t.byte, Fill(24, sign && byteShift(7)), half(31,8)), byteShift)
def wordData = genData(2)
def data = genData(0)
}
class AMOALU(rhsIsAligned: Boolean = false)(implicit p: Parameters) extends CacheModule()(p) {
@ -91,8 +62,9 @@ class AMOALU(rhsIsAligned: Boolean = false)(implicit p: Parameters) extends Cach
val out = Bits(OUTPUT, operandBits)
}
val storegen = if(rhsIsAligned) new StoreGenAligned64(io.typ, io.addr, io.rhs)
else new StoreGen64(io.typ, io.addr, io.rhs)
val storegen =
if(rhsIsAligned) new StoreGenAligned(io.typ, io.addr, io.rhs, operandBits/8)
else new StoreGen(io.typ, io.addr, io.rhs, operandBits/8)
val rhs = storegen.wordData
val sgned = io.cmd === M_XA_MIN || io.cmd === M_XA_MAX