NuBusFPGA/nubus-to-ztex-gateware/Goblin2c.scala
Romain Dolbeau 87d04b187f Rounding FMA
2022-08-27 08:30:21 +02:00

145 lines
5.9 KiB
Scala

// WARNING: this is auto-generated code!
// See https://github.com/rdolbeau/VexRiscvBPluginGenerator/
package vexriscv.plugin
import spinal.core._
import vexriscv.{Stageable, DecoderService, VexRiscv}
object Goblin2cPlugin {
object Goblin2cCtrlEnum extends SpinalEnum(binarySequential) {
val CTRL_UFMA8VxV = newElement()
}
object Goblin2cCtrl extends Stageable(Goblin2cCtrlEnum())
// Prologue
def fun_ufma8vxv(rs1: Bits, rs2: Bits, rs3: Bits, low: Bool) : Bits = {
val al = low ? rs2( 7 downto 0) | rs2(31 downto 24)
val h0 = (rs1( 7 downto 0).asUInt * al.asUInt).asBits
val h1 = (rs1(15 downto 8).asUInt * al.asUInt).asBits
val h2 = (rs1(23 downto 16).asUInt * al.asUInt).asBits
val h3 = (rs1(31 downto 24).asUInt * al.asUInt).asBits
//rs3 ## h3(15 downto 8) ## h2(15 downto 8) ## h1(15 downto 8) ## h0(15 downto 8) // return value
//var r0 = ((h0 ## B"8'x00").asUInt + h0.asUInt + h0(15 downto 7).asUInt).asBits
//var r1 = ((h1 ## B"8'x00").asUInt + h1.asUInt + h1(15 downto 7).asUInt).asBits
//var r2 = ((h2 ## B"8'x00").asUInt + h2.asUInt + h2(15 downto 7).asUInt).asBits
//var r3 = ((h3 ## B"8'x00").asUInt + h3.asUInt + h3(15 downto 7).asUInt).asBits
//rs3 ## r3(23 downto 16) ## r2(23 downto 16) ## r1(23 downto 16) ## r0(23 downto 16) // return value
rs3 ## h3 ## h2 ## h1 ## h0
}
def fun_ufma8vxv2(input: Bits) : Bits = {
//val rs3 = input(63 downto 32)
val rs3 = input(95 downto 64)
val h3 = input(63 downto 48)
val h2 = input(47 downto 32)
val h1 = input(31 downto 16)
val h0 = input(15 downto 0)
var r0 = ((h0 ## B"8'x00").asUInt + h0.asUInt + h0(15 downto 7).asUInt).asBits
var r1 = ((h1 ## B"8'x00").asUInt + h1.asUInt + h1(15 downto 7).asUInt).asBits
var r2 = ((h2 ## B"8'x00").asUInt + h2.asUInt + h2(15 downto 7).asUInt).asBits
var r3 = ((h3 ## B"8'x00").asUInt + h3.asUInt + h3(15 downto 7).asUInt).asBits
//val f0 = (input( 7 downto 0).asUInt +| rs3( 7 downto 0).asUInt).asBits.resize(8)
//val f1 = (input(15 downto 8).asUInt +| rs3(15 downto 8).asUInt).asBits.resize(8)
//val f2 = (input(23 downto 16).asUInt +| rs3(23 downto 16).asUInt).asBits.resize(8)
//val f3 = (input(31 downto 24).asUInt +| rs3(31 downto 24).asUInt).asBits.resize(8)
val f0 = (r0(23 downto 16).asUInt +| rs3( 7 downto 0).asUInt).asBits.resize(8)
val f1 = (r1(23 downto 16).asUInt +| rs3(15 downto 8).asUInt).asBits.resize(8)
val f2 = (r2(23 downto 16).asUInt +| rs3(23 downto 16).asUInt).asBits.resize(8)
val f3 = (r3(23 downto 16).asUInt +| rs3(31 downto 24).asUInt).asBits.resize(8)
f3 ## f2 ## f1 ## f0 // return value
}
// End prologue
} // object Plugin
class Goblin2cPlugin(earlyInjection : Boolean = true) extends Plugin[VexRiscv] {
import Goblin2cPlugin._
object IS_Goblin2c extends Stageable(Bool)
object Goblin2c_FINAL_OUTPUT extends Stageable(Bits(32 bits))
object Goblin2c_INTERMEDIATE_UFMA8VxV96 extends Stageable(Bits(96 bits))
override def setup(pipeline: VexRiscv): Unit = {
import pipeline.config._
val immediateActions = List[(Stageable[_ <: BaseType],Any)](
SRC1_CTRL -> Src1CtrlEnum.RS,
SRC2_CTRL -> Src2CtrlEnum.IMI,
REGFILE_WRITE_VALID -> True,
BYPASSABLE_EXECUTE_STAGE -> False,
BYPASSABLE_MEMORY_STAGE -> Bool(earlyInjection),
RS1_USE -> True,
IS_Goblin2c -> True
)
val binaryActions = List[(Stageable[_ <: BaseType],Any)](
SRC1_CTRL -> Src1CtrlEnum.RS,
SRC2_CTRL -> Src2CtrlEnum.RS,
REGFILE_WRITE_VALID -> True,
BYPASSABLE_EXECUTE_STAGE -> False,
BYPASSABLE_MEMORY_STAGE -> Bool(earlyInjection),
RS1_USE -> True,
RS2_USE -> True,
IS_Goblin2c -> True
)
val unaryActions = List[(Stageable[_ <: BaseType],Any)](
SRC1_CTRL -> Src1CtrlEnum.RS,
REGFILE_WRITE_VALID -> True,
BYPASSABLE_EXECUTE_STAGE -> False,
BYPASSABLE_MEMORY_STAGE -> Bool(earlyInjection),
RS1_USE -> True,
IS_Goblin2c -> True
)
val ternaryActions = List[(Stageable[_ <: BaseType],Any)](
SRC1_CTRL -> Src1CtrlEnum.RS,
SRC2_CTRL -> Src2CtrlEnum.RS,
SRC3_CTRL -> Src3CtrlEnum.RS,
REGFILE_WRITE_VALID -> True,
BYPASSABLE_EXECUTE_STAGE -> False,
BYPASSABLE_MEMORY_STAGE -> Bool(earlyInjection),
RS1_USE -> True,
RS2_USE -> True,
RS3_USE -> True,
IS_Goblin2c -> True
)
val immTernaryActions = List[(Stageable[_ <: BaseType],Any)](
SRC1_CTRL -> Src1CtrlEnum.RS,
SRC2_CTRL -> Src2CtrlEnum.IMI,
SRC3_CTRL -> Src3CtrlEnum.RS,
REGFILE_WRITE_VALID -> True,
BYPASSABLE_EXECUTE_STAGE -> False,
BYPASSABLE_MEMORY_STAGE -> Bool(earlyInjection),
RS1_USE -> True,
RS3_USE -> True,
IS_Goblin2c -> True
)
def UFMA8VxV_KEY = M"11001-0----------000----01110111"
val decoderService = pipeline.service(classOf[DecoderService])
decoderService.addDefault(IS_Goblin2c, False)
decoderService.add(List(
UFMA8VxV_KEY -> (ternaryActions ++ List(Goblin2cCtrl -> Goblin2cCtrlEnum.CTRL_UFMA8VxV))
))
} // override def setup
override def build(pipeline: VexRiscv): Unit = {
import pipeline._
import pipeline.config._
execute plug new Area{
import execute._
insert(Goblin2c_INTERMEDIATE_UFMA8VxV96) := fun_ufma8vxv(input(SRC1), input(SRC2), input(SRC3), (input(INSTRUCTION)(26).asUInt === 1)).asBits
} // execute plug newArea
memory plug new Area{
import memory._
insert(Goblin2c_FINAL_OUTPUT) := fun_ufma8vxv2(input(Goblin2c_INTERMEDIATE_UFMA8VxV96)).asBits
} // memory plug newArea
val injectionStage = if(earlyInjection) memory else writeBack
injectionStage plug new Area {
import injectionStage._
when (arbitration.isValid && input(IS_Goblin2c)) {
output(REGFILE_WRITE_DATA) := input(Goblin2c_FINAL_OUTPUT)
} // when input is
} // injectionStage plug newArea
} // override def build
} // class Plugin