riscv/rocket-chip
1
0
Fork 0
Code Releases Activity

Integrate divide/sqrt unit

Browse Source
This commit is contained in:
Andrew Waterman 2015-04-04 16:39:17 -07:00
parent fe27b9b1b2
commit 9ade0e41cc
3 changed files with 149 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
rocket/src/main/scala/core.scala
View File

@ -7,6 +7,7 @@ import Util._
import uncore._ import uncore._
case object BuildFPU extends Field[Option[() => FPU]] case object BuildFPU extends Field[Option[() => FPU]]
case object FDivSqrt extends Field[Boolean]
case object XLen extends Field[Int] case object XLen extends Field[Int]
case object NMultXpr extends Field[Int] case object NMultXpr extends Field[Int]
case object FetchWidth extends Field[Int] case object FetchWidth extends Field[Int]

10
rocket/src/main/scala/ctrl.scala
View File

@ -296,6 +296,15 @@ object FDecode extends DecodeConstants
FSD-> List(Y, Y,N,N,N,N,N,Y,A2_IMM, A1_RS1, IMM_S, DW_XPR,FN_ADD, Y,M_XWR, MT_D, N,Y,N,N,N,N,CSR.N,N,N,N)) FSD-> List(Y, Y,N,N,N,N,N,Y,A2_IMM, A1_RS1, IMM_S, DW_XPR,FN_ADD, Y,M_XWR, MT_D, N,Y,N,N,N,N,CSR.N,N,N,N))
} }
object FDivSqrtDecode extends DecodeConstants
{
val table = Array(
FDIV_S-> List(Y, Y,N,N,N,N,N,N,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, Y,Y,N,Y,N,N,CSR.N,N,N,N),
FDIV_D-> List(Y, Y,N,N,N,N,N,N,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, Y,Y,N,Y,N,N,CSR.N,N,N,N),
FSQRT_S-> List(Y, Y,N,N,N,N,N,N,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, Y,Y,N,Y,N,N,CSR.N,N,N,N),
FSQRT_D-> List(Y, Y,N,N,N,N,N,N,A2_X, A1_X, IMM_X, DW_X, FN_X, N,M_X, MT_X, Y,Y,N,Y,N,N,CSR.N,N,N,N))
}
object RoCCDecode extends DecodeConstants object RoCCDecode extends DecodeConstants
{ {
val table = Array( val table = Array(
@ -345,6 +354,7 @@ class Control extends CoreModule
var decode_table = XDecode.table var decode_table = XDecode.table
if (!params(BuildFPU).isEmpty) decode_table ++= FDecode.table if (!params(BuildFPU).isEmpty) decode_table ++= FDecode.table
if (!params(BuildFPU).isEmpty && params(FDivSqrt)) decode_table ++= FDivSqrtDecode.table
if (!params(BuildRoCC).isEmpty) decode_table ++= RoCCDecode.table if (!params(BuildRoCC).isEmpty) decode_table ++= RoCCDecode.table
val id_ctrl = new IntCtrlSigs().decode(io.dpath.inst, decode_table) val id_ctrl = new IntCtrlSigs().decode(io.dpath.inst, decode_table)

219
rocket/src/main/scala/fpu.scala
View File

@ -20,8 +20,8 @@ object FPConstants
val FCMD_MSUB = Bits("b1??01") val FCMD_MSUB = Bits("b1??01")
val FCMD_NMSUB = Bits("b1??10") val FCMD_NMSUB = Bits("b1??10")
val FCMD_NMADD = Bits("b1??11") val FCMD_NMADD = Bits("b1??11")
val FCMD_DIV = Bits("b?0?11") val FCMD_DIV = Bits("b?0011")
val FCMD_SQRT = Bits("b?1?11") val FCMD_SQRT = Bits("b?1011")
val FCMD_SGNJ = Bits("b??1?0") val FCMD_SGNJ = Bits("b??1?0")
val FCMD_MINMAX = Bits("b?01?1") val FCMD_MINMAX = Bits("b?01?1")
val FCMD_CVT_FF = Bits("b??0??") val FCMD_CVT_FF = Bits("b??0??")
@ -45,13 +45,17 @@ class FPUCtrlSigs extends Bundle
val ren1 = Bool() val ren1 = Bool()
val ren2 = Bool() val ren2 = Bool()
val ren3 = Bool() val ren3 = Bool()
val swap12 = Bool()
val swap23 = Bool() val swap23 = Bool()
val single = Bool() val single = Bool()
val fromint = Bool() val fromint = Bool()
val toint = Bool() val toint = Bool()
val fastpipe = Bool() val fastpipe = Bool()
val fma = Bool() val fma = Bool()
val div = Bool()
val sqrt = Bool()
val round = Bool() val round = Bool()
val wflags = Bool()
} }
class FPUDecoder extends Module class FPUDecoder extends Module
@ -65,69 +69,73 @@ class FPUDecoder extends Module
val Y = Bool(true) val Y = Bool(true)
val X = Bool(false) val X = Bool(false)
val decoder = DecodeLogic(io.inst, val decoder = DecodeLogic(io.inst,
List (FCMD_X, X,X,X,X,X,X,X,X,X,X,X,X), List (FCMD_X, X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X),
Array(FLW -> List(FCMD_X, Y,Y,N,N,N,X,Y,N,N,N,N,N), Array(FLW -> List(FCMD_X, Y,Y,N,N,N,X,X,Y,N,N,N,N,N,N,N,N),
FLD -> List(FCMD_X, Y,Y,N,N,N,X,N,N,N,N,N,N), FLD -> List(FCMD_X, Y,Y,N,N,N,X,X,N,N,N,N,N,N,N,N,N),
FSW -> List(FCMD_MV_XF, Y,N,N,Y,N,X,Y,N,Y,N,N,N), FSW -> List(FCMD_MV_XF, Y,N,N,Y,N,Y,X,Y,N,Y,N,N,N,N,N,N),
FSD -> List(FCMD_MV_XF, Y,N,N,Y,N,X,N,N,Y,N,N,N), FSD -> List(FCMD_MV_XF, Y,N,N,Y,N,Y,X,N,N,Y,N,N,N,N,N,N),
FMV_S_X -> List(FCMD_MV_FX, N,Y,N,N,N,X,Y,Y,N,N,N,Y), FMV_S_X -> List(FCMD_MV_FX, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y,N),
FMV_D_X -> List(FCMD_MV_FX, N,Y,N,N,N,X,N,Y,N,N,N,Y), FMV_D_X -> List(FCMD_MV_FX, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y,N),
FCVT_S_W -> List(FCMD_CVT_FI, N,Y,N,N,N,X,Y,Y,N,N,N,Y), FCVT_S_W -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y,Y),
FCVT_S_WU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,Y,Y,N,N,N,Y), FCVT_S_WU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y,Y),
FCVT_S_L -> List(FCMD_CVT_FI, N,Y,N,N,N,X,Y,Y,N,N,N,Y), FCVT_S_L -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y,Y),
FCVT_S_LU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,Y,Y,N,N,N,Y), FCVT_S_LU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y,Y),
FCVT_D_W -> List(FCMD_CVT_FI, N,Y,N,N,N,X,N,Y,N,N,N,Y), FCVT_D_W -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y,Y),
FCVT_D_WU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,N,Y,N,N,N,Y), FCVT_D_WU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y,Y),
FCVT_D_L -> List(FCMD_CVT_FI, N,Y,N,N,N,X,N,Y,N,N,N,Y), FCVT_D_L -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y,Y),
FCVT_D_LU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,N,Y,N,N,N,Y), FCVT_D_LU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y,Y),
FMV_X_S -> List(FCMD_MV_XF, N,N,Y,N,N,X,Y,N,Y,N,N,Y), FMV_X_S -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y,N),
FMV_X_D -> List(FCMD_MV_XF, N,N,Y,N,N,X,N,N,Y,N,N,Y), FMV_X_D -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y,N),
FCLASS_S -> List(FCMD_MV_XF, N,N,Y,N,N,X,Y,N,Y,N,N,Y), FCLASS_S -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y,N),
FCLASS_D -> List(FCMD_MV_XF, N,N,Y,N,N,X,N,N,Y,N,N,Y), FCLASS_D -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y,N),
FCVT_W_S -> List(FCMD_CVT_IF, N,N,Y,N,N,X,Y,N,Y,N,N,Y), FCVT_W_S -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y,Y),
FCVT_WU_S-> List(FCMD_CVT_IF, N,N,Y,N,N,X,Y,N,Y,N,N,Y), FCVT_WU_S-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y,Y),
FCVT_L_S -> List(FCMD_CVT_IF, N,N,Y,N,N,X,Y,N,Y,N,N,Y), FCVT_L_S -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y,Y),
FCVT_LU_S-> List(FCMD_CVT_IF, N,N,Y,N,N,X,Y,N,Y,N,N,Y), FCVT_LU_S-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y,Y),
FCVT_W_D -> List(FCMD_CVT_IF, N,N,Y,N,N,X,N,N,Y,N,N,Y), FCVT_W_D -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y,Y),
FCVT_WU_D-> List(FCMD_CVT_IF, N,N,Y,N,N,X,N,N,Y,N,N,Y), FCVT_WU_D-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y,Y),
FCVT_L_D -> List(FCMD_CVT_IF, N,N,Y,N,N,X,N,N,Y,N,N,Y), FCVT_L_D -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y,Y),
FCVT_LU_D-> List(FCMD_CVT_IF, N,N,Y,N,N,X,N,N,Y,N,N,Y), FCVT_LU_D-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y,Y),
FCVT_S_D -> List(FCMD_CVT_FF, N,Y,Y,N,N,X,Y,N,N,Y,N,Y), FCVT_S_D -> List(FCMD_CVT_FF, N,Y,Y,N,N,N,X,Y,N,N,Y,N,N,N,Y,Y),
FCVT_D_S -> List(FCMD_CVT_FF, N,Y,Y,N,N,X,N,N,N,Y,N,Y), FCVT_D_S -> List(FCMD_CVT_FF, N,Y,Y,N,N,N,X,N,N,N,Y,N,N,N,Y,Y),
FEQ_S -> List(FCMD_CMP, N,N,Y,Y,N,N,Y,N,Y,N,N,N), FEQ_S -> List(FCMD_CMP, N,N,Y,Y,N,N,N,Y,N,Y,N,N,N,N,N,Y),
FLT_S -> List(FCMD_CMP, N,N,Y,Y,N,N,Y,N,Y,N,N,N), FLT_S -> List(FCMD_CMP, N,N,Y,Y,N,N,N,Y,N,Y,N,N,N,N,N,Y),
FLE_S -> List(FCMD_CMP, N,N,Y,Y,N,N,Y,N,Y,N,N,N), FLE_S -> List(FCMD_CMP, N,N,Y,Y,N,N,N,Y,N,Y,N,N,N,N,N,Y),
FEQ_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,Y,N,N,N), FEQ_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,N,Y,N,N,N,N,N,Y),
FLT_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,Y,N,N,N), FLT_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,N,Y,N,N,N,N,N,Y),
FLE_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,Y,N,N,N), FLE_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,N,Y,N,N,N,N,N,Y),
FSGNJ_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,Y,N,N,Y,N,N), FSGNJ_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N,N),
FSGNJN_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,Y,N,N,Y,N,N), FSGNJN_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N,N),
FSGNJX_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,Y,N,N,Y,N,N), FSGNJX_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N,N),
FSGNJ_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,Y,N,N), FSGNJ_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,N),
FSGNJN_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,Y,N,N), FSGNJN_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,N),
FSGNJX_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,Y,N,N), FSGNJX_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,N),
FMIN_S -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,Y,N,N,Y,N,N), FMIN_S -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N,Y),
FMAX_S -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,Y,N,N,Y,N,N), FMAX_S -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N,Y),
FMIN_D -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,N,N,Y,N,N), FMIN_D -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,Y),
FMAX_D -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,N,N,Y,N,N), FMAX_D -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,Y),
FADD_S -> List(FCMD_ADD, N,Y,Y,Y,N,Y,Y,N,N,N,Y,Y), FADD_S -> List(FCMD_ADD, N,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y,Y),
FSUB_S -> List(FCMD_SUB, N,Y,Y,Y,N,Y,Y,N,N,N,Y,Y), FSUB_S -> List(FCMD_SUB, N,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y,Y),
FMUL_S -> List(FCMD_MUL, N,Y,Y,Y,N,N,Y,N,N,N,Y,Y), FMUL_S -> List(FCMD_MUL, N,Y,Y,Y,N,N,N,Y,N,N,N,Y,N,N,Y,Y),
FADD_D -> List(FCMD_ADD, N,Y,Y,Y,N,Y,N,N,N,N,Y,Y), FADD_D -> List(FCMD_ADD, N,Y,Y,Y,N,N,Y,N,N,N,N,Y,N,N,Y,Y),
FSUB_D -> List(FCMD_SUB, N,Y,Y,Y,N,Y,N,N,N,N,Y,Y), FSUB_D -> List(FCMD_SUB, N,Y,Y,Y,N,N,Y,N,N,N,N,Y,N,N,Y,Y),
FMUL_D -> List(FCMD_MUL, N,Y,Y,Y,N,N,N,N,N,N,Y,Y), FMUL_D -> List(FCMD_MUL, N,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,Y,Y),
FMADD_S -> List(FCMD_MADD, N,Y,Y,Y,Y,N,Y,N,N,N,Y,Y), FMADD_S -> List(FCMD_MADD, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y,Y),
FMSUB_S -> List(FCMD_MSUB, N,Y,Y,Y,Y,N,Y,N,N,N,Y,Y), FMSUB_S -> List(FCMD_MSUB, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y,Y),
FNMADD_S -> List(FCMD_NMADD, N,Y,Y,Y,Y,N,Y,N,N,N,Y,Y), FNMADD_S -> List(FCMD_NMADD, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y,Y),
FNMSUB_S -> List(FCMD_NMSUB, N,Y,Y,Y,Y,N,Y,N,N,N,Y,Y), FNMSUB_S -> List(FCMD_NMSUB, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y,Y),
FMADD_D -> List(FCMD_MADD, N,Y,Y,Y,Y,N,N,N,N,N,Y,Y), FMADD_D -> List(FCMD_MADD, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y,Y),
FMSUB_D -> List(FCMD_MSUB, N,Y,Y,Y,Y,N,N,N,N,N,Y,Y), FMSUB_D -> List(FCMD_MSUB, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y,Y),
FNMADD_D -> List(FCMD_NMADD, N,Y,Y,Y,Y,N,N,N,N,N,Y,Y), FNMADD_D -> List(FCMD_NMADD, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y,Y),
FNMSUB_D -> List(FCMD_NMSUB, N,Y,Y,Y,Y,N,N,N,N,N,Y,Y) FNMSUB_D -> List(FCMD_NMSUB, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y,Y),
FDIV_S -> List(FCMD_DIV, N,Y,Y,Y,N,N,N,Y,N,N,N,N,Y,N,Y,Y),
FSQRT_S -> List(FCMD_SQRT, N,Y,Y,N,N,Y,X,Y,N,N,N,N,N,Y,Y,Y),
FDIV_D -> List(FCMD_DIV, N,Y,Y,Y,N,N,N,N,N,N,N,N,Y,N,Y,Y),
FSQRT_D -> List(FCMD_SQRT, N,Y,Y,N,N,Y,X,N,N,N,N,N,N,Y,Y,Y)
)) ))
val s = io.sigs val s = io.sigs
Vec(s.cmd, s.ldst, s.wen, s.ren1, s.ren2, s.ren3, s.swap23, s.single, s.fromint, Vec(s.cmd, s.ldst, s.wen, s.ren1, s.ren2, s.ren3, s.swap12, s.swap23, s.single, s.fromint,
s.toint, s.fastpipe, s.fma, s.round) := decoder s.toint, s.fastpipe, s.fma, s.div, s.sqrt, s.round, s.wflags) := decoder
} }
class DpathFPUIO extends Bundle { class DpathFPUIO extends Bundle {
@ -177,6 +185,7 @@ class FPToInt extends Module
{ {
val io = new Bundle { val io = new Bundle {
val in = Valid(new FPInput).flip val in = Valid(new FPInput).flip
val as_double = new FPInput().asOutput
val out = Valid(new Bundle { val out = Valid(new Bundle {
val lt = Bool() val lt = Bool()
val store = Bits(width = 64) val store = Bits(width = 64)
@ -227,6 +236,7 @@ class FPToInt extends Module
io.out.valid := valid io.out.valid := valid
io.out.bits.lt := dcmp.io.a_lt_b io.out.bits.lt := dcmp.io.a_lt_b
io.as_double := in
} }
class IntToFP(val latency: Int) extends Module class IntToFP(val latency: Int) extends Module
@ -380,13 +390,16 @@ class FPU extends Module
val ex_ra1::ex_ra2::ex_ra3::Nil = List.fill(3)(Reg(UInt())) val ex_ra1::ex_ra2::ex_ra3::Nil = List.fill(3)(Reg(UInt()))
when (io.ctrl.valid) { when (io.ctrl.valid) {
when (id_ctrl.ren1) { ex_ra1 := io.dpath.inst(19,15) } when (id_ctrl.ren1) {
when (id_ctrl.ren3) { ex_ra3 := io.dpath.inst(31,27) } when (!id_ctrl.swap12) { ex_ra1 := io.dpath.inst(19,15) }
when (id_ctrl.ren2) { when (id_ctrl.swap12) { ex_ra2 := io.dpath.inst(19,15) }
when ( id_ctrl.ldst) { ex_ra1 := io.dpath.inst(24,20) }
when (!id_ctrl.ldst && !id_ctrl.swap23) { ex_ra2 := io.dpath.inst(24,20) }
when (!id_ctrl.ldst && id_ctrl.swap23) { ex_ra3 := io.dpath.inst(24,20) }
} }
when (id_ctrl.ren2) {
when (id_ctrl.swap12) { ex_ra1 := io.dpath.inst(24,20) }
when (id_ctrl.swap23) { ex_ra3 := io.dpath.inst(24,20) }
when (!id_ctrl.swap12 && !id_ctrl.swap23) { ex_ra2 := io.dpath.inst(24,20) }
}
when (id_ctrl.ren3) { ex_ra3 := io.dpath.inst(31,27) }
} }
val ex_rs1::ex_rs2::ex_rs3::Nil = Seq(ex_ra1, ex_ra2, ex_ra3).map(regfile(_)) val ex_rs1::ex_rs2::ex_rs3::Nil = Seq(ex_ra1, ex_ra2, ex_ra3).map(regfile(_))
val ex_rm = Mux(ex_reg_inst(14,12) === Bits(7), io.dpath.fcsr_rm, ex_reg_inst(14,12)) val ex_rm = Mux(ex_reg_inst(14,12) === Bits(7), io.dpath.fcsr_rm, ex_reg_inst(14,12))
@ -408,7 +421,7 @@ class FPU extends Module
dfma.io.in.bits := req dfma.io.in.bits := req
val fpiu = Module(new FPToInt) val fpiu = Module(new FPToInt)
fpiu.io.in.valid := ex_reg_valid && (ex_ctrl.toint || ex_ctrl.cmd === FCMD_MINMAX) fpiu.io.in.valid := ex_reg_valid && (ex_ctrl.toint || ex_ctrl.div || ex_ctrl.sqrt || ex_ctrl.cmd === FCMD_MINMAX)
fpiu.io.in.bits := req fpiu.io.in.bits := req
io.dpath.store_data := fpiu.io.out.bits.store io.dpath.store_data := fpiu.io.out.bits.store
io.dpath.toint_data := fpiu.io.out.bits.toint io.dpath.toint_data := fpiu.io.out.bits.toint
@ -423,6 +436,15 @@ class FPU extends Module
fpmu.io.in.bits := req fpmu.io.in.bits := req
fpmu.io.lt := fpiu.io.out.bits.lt fpmu.io.lt := fpiu.io.out.bits.lt
val divSqrt = Module(new hardfloat.divSqrtRecodedFloat64)
val divSqrt_inReady = Mux(divSqrt.io.sqrtOp, divSqrt.io.inReady_sqrt, divSqrt.io.inReady_div)
val divSqrt_outValid = divSqrt.io.outValid_div || divSqrt.io.outValid_sqrt
val divSqrt_wen = Reg(next=Bool(false))
val divSqrt_waddr = Reg(Bits())
val divSqrt_wdata = Bits()
val divSqrt_flags = Bits()
val divSqrt_in_flight = Reg(init=Bool(false))
// writeback arbitration // writeback arbitration
case class Pipe(p: Module, lat: Int, cond: (FPUCtrlSigs) => Bool, wdata: Bits, wexc: Bits) case class Pipe(p: Module, lat: Int, cond: (FPUCtrlSigs) => Bool, wdata: Bits, wexc: Bits)
val pipes = List( val pipes = List(
@ -459,28 +481,63 @@ class FPU extends Module
} }
} }
val waddr = winfo(0)(4,0).toUInt val waddr = Mux(divSqrt_wen, divSqrt_waddr, winfo(0)(4,0).toUInt)
val wsrc = winfo(0) >> waddr.getWidth val wsrc = winfo(0) >> 5
val wdata = Vec(pipes.map(_.wdata))(wsrc) val wdata = Mux(divSqrt_wen, divSqrt_wdata, Vec(pipes.map(_.wdata))(wsrc))
val wexc = Vec(pipes.map(_.wexc))(wsrc) val wexc = Vec(pipes.map(_.wexc))(wsrc)
when (wen(0)) { regfile(waddr(4,0)) := wdata } when (wen(0) || divSqrt_wen) { regfile(waddr) := wdata }
val wb_toint_valid = wb_reg_valid && wb_ctrl.toint val wb_toint_valid = wb_reg_valid && wb_ctrl.toint
val wb_toint_exc = RegEnable(fpiu.io.out.bits.exc, mem_ctrl.toint) val wb_toint_exc = RegEnable(fpiu.io.out.bits.exc, mem_ctrl.toint)
io.dpath.fcsr_flags.valid := wb_toint_valid || wen(0) io.dpath.fcsr_flags.valid := wb_toint_valid || divSqrt_wen || wen(0)
io.dpath.fcsr_flags.bits := io.dpath.fcsr_flags.bits :=
Mux(wb_toint_valid, wb_toint_exc, UInt(0)) | Mux(wb_toint_valid, wb_toint_exc, UInt(0)) |
Mux(divSqrt_wen, divSqrt_flags, UInt(0)) |
Mux(wen(0), wexc, UInt(0)) Mux(wen(0), wexc, UInt(0))
val fp_inflight = wb_reg_valid && wb_ctrl.toint || wen.orR val units_busy = mem_reg_valid && (mem_ctrl.div || mem_ctrl.sqrt) && (!divSqrt_inReady || wen.orR) // || mem_reg_valid && mem_ctrl.fma && Reg(next=Mux(ex_ctrl.single, io.sfma.valid, io.dfma.valid))
val units_busy = Bool(false) //mem_reg_valid && mem_ctrl.fma && Reg(next=Mux(ex_ctrl.single, io.sfma.valid, io.dfma.valid)) io.ctrl.fcsr_rdy := !(ex_reg_valid && ex_ctrl.wflags || mem_reg_valid && mem_ctrl.wflags || wb_reg_valid && wb_ctrl.toint || wen.orR || divSqrt_in_flight)
io.ctrl.fcsr_rdy := !fp_inflight io.ctrl.nack_mem := units_busy || write_port_busy || divSqrt_in_flight
io.ctrl.nack_mem := units_busy || write_port_busy
io.ctrl.dec <> fp_decoder.io.sigs io.ctrl.dec <> fp_decoder.io.sigs
def useScoreboard(f: ((Pipe, Int)) => Bool) = pipes.zipWithIndex.filter(_._1.lat > 3).map(x => f(x)).fold(Bool(false))(_||_) def useScoreboard(f: ((Pipe, Int)) => Bool) = pipes.zipWithIndex.filter(_._1.lat > 3).map(x => f(x)).fold(Bool(false))(_||_)
io.ctrl.sboard_set := wb_reg_valid && Reg(next=useScoreboard(_._1.cond(mem_ctrl))) io.ctrl.sboard_set := wb_reg_valid && Reg(next=useScoreboard(_._1.cond(mem_ctrl)) || mem_ctrl.div || mem_ctrl.sqrt)
io.ctrl.sboard_clr := wen(0) && useScoreboard(x => wsrc === UInt(x._2)) io.ctrl.sboard_clr := divSqrt_wen || (wen(0) && useScoreboard(x => wsrc === UInt(x._2)))
io.ctrl.sboard_clra := waddr io.ctrl.sboard_clra := waddr
// we don't currently support round-max-magnitude (rm=4) // we don't currently support round-max-magnitude (rm=4)
io.ctrl.illegal_rm := ex_rm(2) && ex_ctrl.round io.ctrl.illegal_rm := ex_rm(2) && ex_ctrl.round
divSqrt_wdata := 0
divSqrt_flags := 0
if (params(FDivSqrt)) {
val divSqrt_single = Reg(Bool())
val divSqrt_rm = Reg(Bits())
val divSqrt_flags_double = Reg(Bits())
val divSqrt_wdata_double = Reg(Bits())
def upconvert(x: UInt) = hardfloat.recodedFloatNToRecodedFloatM(x, Bits(0), 23, 9, 52, 12)._1
val divSqrt_wb_hazard = wen.orR
divSqrt.io.inValid := mem_reg_valid && !divSqrt_wb_hazard && !divSqrt_in_flight && !io.ctrl.killm && (mem_ctrl.div || mem_ctrl.sqrt)
divSqrt.io.sqrtOp := mem_ctrl.sqrt
divSqrt.io.a := fpiu.io.as_double.in1
divSqrt.io.b := fpiu.io.as_double.in2
divSqrt.io.roundingMode := fpiu.io.as_double.rm
when (divSqrt.io.inValid && divSqrt_inReady) {
divSqrt_in_flight := true
divSqrt_single := mem_ctrl.single
divSqrt_waddr := mem_reg_inst(11,7)
divSqrt_rm := divSqrt.io.roundingMode
}
when (divSqrt_outValid) {
divSqrt_wen := true
divSqrt_wdata_double := divSqrt.io.out
divSqrt_in_flight := false
divSqrt_flags_double := divSqrt.io.exceptionFlags
}
val divSqrt_toSingle = hardfloat.recodedFloatNToRecodedFloatM(divSqrt_wdata_double, ex_rm, 52, 12, 23, 9)
divSqrt_wdata := Mux(divSqrt_single, divSqrt_toSingle._1, divSqrt_wdata_double)
divSqrt_flags := divSqrt_flags_double | Mux(divSqrt_single, divSqrt_toSingle._2, Bits(0))
}
} }