Implement new FP encoding proposal
https://groups.google.com/a/groups.riscv.org/d/msg/isa-dev/_r7hBlzsEd8/cWPyJKMzCQAJ
This commit is contained in:
Andrew Waterman
Andrew Waterman
parent
470c6711a7
commit
9a983c12a3
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@ -1 +1 @@
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Subproject commit 8a8d7e680d48c4dc46b2ac0e8114d400d7afc4af
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Subproject commit cd8bc4798c38ba11118492474e96baf717c7af36
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@ -20,32 +20,11 @@ case class FPUParams(
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object FPConstants
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{
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def FCMD_ADD = BitPat("b0??00")
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def FCMD_SUB = BitPat("b0??01")
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def FCMD_MUL = BitPat("b0??10")
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def FCMD_MADD = BitPat("b1??00")
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def FCMD_MSUB = BitPat("b1??01")
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def FCMD_NMSUB = BitPat("b1??10")
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def FCMD_NMADD = BitPat("b1??11")
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def FCMD_DIV = BitPat("b?0011")
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def FCMD_SQRT = BitPat("b?1011")
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def FCMD_SGNJ = BitPat("b??1?0")
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def FCMD_MINMAX = BitPat("b?01?1")
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def FCMD_CVT_FF = BitPat("b??0??")
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def FCMD_CVT_IF = BitPat("b?10??")
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def FCMD_CMP = BitPat("b?01??")
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def FCMD_MV_XF = BitPat("b?11??")
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def FCMD_CVT_FI = BitPat("b??0??")
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def FCMD_MV_FX = BitPat("b??1??")
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def FCMD_X = BitPat("b?????")
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val FCMD_WIDTH = 5
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val RM_SZ = 3
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val FLAGS_SZ = 5
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}
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trait HasFPUCtrlSigs {
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val cmd = Bits(width = FCMD_WIDTH)
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val ldst = Bool()
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val wen = Bool()
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val ren1 = Bool()
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@ -53,7 +32,8 @@ trait HasFPUCtrlSigs {
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val ren3 = Bool()
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val swap12 = Bool()
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val swap23 = Bool()
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val single = Bool()
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val singleIn = Bool()
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val singleOut = Bool()
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val fromint = Bool()
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val toint = Bool()
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val fastpipe = Bool()
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@ -71,71 +51,71 @@ class FPUDecoder(implicit p: Parameters) extends FPUModule()(p) {
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val sigs = new FPUCtrlSigs().asOutput
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}
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val default = List(FCMD_X, X,X,X,X,X,X,X,X,X,X,X,X,X,X,X)
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val default = List(X,X,X,X,X,X,X,X,X,X,X,X,X,X,X,X)
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val f =
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Array(FLW -> List(FCMD_X, Y,Y,N,N,N,X,X,Y,N,N,N,N,N,N,N),
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FSW -> List(FCMD_MV_XF, Y,N,N,Y,N,Y,X,Y,N,Y,N,N,N,N,N),
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FMV_S_X -> List(FCMD_MV_FX, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,N),
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FCVT_S_W -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y),
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FCVT_S_WU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y),
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FCVT_S_L -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y),
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FCVT_S_LU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,Y,Y,N,N,N,N,N,Y),
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FMV_X_S -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,N),
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FCLASS_S -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,N),
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FCVT_W_S -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y),
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FCVT_WU_S-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y),
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FCVT_L_S -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y),
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FCVT_LU_S-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,Y,N,Y,N,N,N,N,Y),
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FEQ_S -> List(FCMD_CMP, N,N,Y,Y,N,N,N,Y,N,Y,N,N,N,N,Y),
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FLT_S -> List(FCMD_CMP, N,N,Y,Y,N,N,N,Y,N,Y,N,N,N,N,Y),
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FLE_S -> List(FCMD_CMP, N,N,Y,Y,N,N,N,Y,N,Y,N,N,N,N,Y),
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FSGNJ_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N),
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FSGNJN_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N),
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FSGNJX_S -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,N),
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FMIN_S -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,Y),
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FMAX_S -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,Y,N,N,Y,N,N,N,Y),
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FADD_S -> List(FCMD_ADD, N,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y),
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FSUB_S -> List(FCMD_SUB, N,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y),
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FMUL_S -> List(FCMD_MUL, N,Y,Y,Y,N,N,N,Y,N,N,N,Y,N,N,Y),
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FMADD_S -> List(FCMD_MADD, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y),
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FMSUB_S -> List(FCMD_MSUB, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y),
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FNMADD_S -> List(FCMD_NMADD, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y),
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FNMSUB_S -> List(FCMD_NMSUB, N,Y,Y,Y,Y,N,N,Y,N,N,N,Y,N,N,Y),
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FDIV_S -> List(FCMD_DIV, N,Y,Y,Y,N,N,N,Y,N,N,N,N,Y,N,Y),
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FSQRT_S -> List(FCMD_SQRT, N,Y,Y,N,N,Y,X,Y,N,N,N,N,N,Y,Y))
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Array(FLW -> List(Y,Y,N,N,N,X,X,X,X,N,N,N,N,N,N,N),
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FSW -> List(Y,N,N,Y,N,Y,X,N,Y,N,Y,N,N,N,N,N),
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FMV_S_X -> List(N,Y,N,N,N,X,X,Y,N,Y,N,N,N,N,N,N),
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FCVT_S_W -> List(N,Y,N,N,N,X,X,Y,Y,Y,N,N,N,N,N,Y),
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FCVT_S_WU-> List(N,Y,N,N,N,X,X,Y,Y,Y,N,N,N,N,N,Y),
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FCVT_S_L -> List(N,Y,N,N,N,X,X,Y,Y,Y,N,N,N,N,N,Y),
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FCVT_S_LU-> List(N,Y,N,N,N,X,X,Y,Y,Y,N,N,N,N,N,Y),
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FMV_X_S -> List(N,N,Y,N,N,N,X,N,Y,N,Y,N,N,N,N,N),
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FCLASS_S -> List(N,N,Y,N,N,N,X,Y,Y,N,Y,N,N,N,N,N),
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FCVT_W_S -> List(N,N,Y,N,N,N,X,Y,Y,N,Y,N,N,N,N,Y),
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FCVT_WU_S-> List(N,N,Y,N,N,N,X,Y,Y,N,Y,N,N,N,N,Y),
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FCVT_L_S -> List(N,N,Y,N,N,N,X,Y,Y,N,Y,N,N,N,N,Y),
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FCVT_LU_S-> List(N,N,Y,N,N,N,X,Y,Y,N,Y,N,N,N,N,Y),
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FEQ_S -> List(N,N,Y,Y,N,N,N,Y,Y,N,Y,N,N,N,N,Y),
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FLT_S -> List(N,N,Y,Y,N,N,N,Y,Y,N,Y,N,N,N,N,Y),
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FLE_S -> List(N,N,Y,Y,N,N,N,Y,Y,N,Y,N,N,N,N,Y),
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FSGNJ_S -> List(N,Y,Y,Y,N,N,N,Y,Y,N,N,Y,N,N,N,N),
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FSGNJN_S -> List(N,Y,Y,Y,N,N,N,Y,Y,N,N,Y,N,N,N,N),
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FSGNJX_S -> List(N,Y,Y,Y,N,N,N,Y,Y,N,N,Y,N,N,N,N),
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FMIN_S -> List(N,Y,Y,Y,N,N,N,Y,Y,N,N,Y,N,N,N,Y),
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FMAX_S -> List(N,Y,Y,Y,N,N,N,Y,Y,N,N,Y,N,N,N,Y),
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FADD_S -> List(N,Y,Y,Y,N,N,Y,Y,Y,N,N,N,Y,N,N,Y),
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FSUB_S -> List(N,Y,Y,Y,N,N,Y,Y,Y,N,N,N,Y,N,N,Y),
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FMUL_S -> List(N,Y,Y,Y,N,N,N,Y,Y,N,N,N,Y,N,N,Y),
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FMADD_S -> List(N,Y,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y),
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FMSUB_S -> List(N,Y,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y),
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FNMADD_S -> List(N,Y,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y),
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FNMSUB_S -> List(N,Y,Y,Y,Y,N,N,Y,Y,N,N,N,Y,N,N,Y),
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FDIV_S -> List(N,Y,Y,Y,N,N,N,Y,Y,N,N,N,N,Y,N,Y),
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FSQRT_S -> List(N,Y,Y,N,N,Y,X,Y,Y,N,N,N,N,N,Y,Y))
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val d =
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Array(FLD -> List(FCMD_X, Y,Y,N,N,N,X,X,N,N,N,N,N,N,N,N),
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FSD -> List(FCMD_MV_XF, Y,N,N,Y,N,Y,X,N,N,Y,N,N,N,N,N),
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FMV_D_X -> List(FCMD_MV_FX, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,N),
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FCVT_D_W -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y),
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FCVT_D_WU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y),
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FCVT_D_L -> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y),
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FCVT_D_LU-> List(FCMD_CVT_FI, N,Y,N,N,N,X,X,N,Y,N,N,N,N,N,Y),
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FMV_X_D -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,N),
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FCLASS_D -> List(FCMD_MV_XF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,N),
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FCVT_W_D -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y),
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FCVT_WU_D-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y),
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FCVT_L_D -> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y),
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FCVT_LU_D-> List(FCMD_CVT_IF, N,N,Y,N,N,N,X,N,N,Y,N,N,N,N,Y),
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FCVT_S_D -> List(FCMD_CVT_FF, N,Y,Y,N,N,N,X,Y,N,N,Y,N,N,N,Y),
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FCVT_D_S -> List(FCMD_CVT_FF, N,Y,Y,N,N,N,X,N,N,N,Y,N,N,N,Y),
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FEQ_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,N,Y,N,N,N,N,Y),
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FLT_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,N,Y,N,N,N,N,Y),
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FLE_D -> List(FCMD_CMP, N,N,Y,Y,N,N,N,N,N,Y,N,N,N,N,Y),
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FSGNJ_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N),
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FSGNJN_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N),
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FSGNJX_D -> List(FCMD_SGNJ, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,N),
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FMIN_D -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,Y),
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FMAX_D -> List(FCMD_MINMAX, N,Y,Y,Y,N,N,N,N,N,N,Y,N,N,N,Y),
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FADD_D -> List(FCMD_ADD, N,Y,Y,Y,N,N,Y,N,N,N,N,Y,N,N,Y),
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FSUB_D -> List(FCMD_SUB, N,Y,Y,Y,N,N,Y,N,N,N,N,Y,N,N,Y),
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FMUL_D -> List(FCMD_MUL, N,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,Y),
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FMADD_D -> List(FCMD_MADD, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y),
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FMSUB_D -> List(FCMD_MSUB, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y),
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FNMADD_D -> List(FCMD_NMADD, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y),
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FNMSUB_D -> List(FCMD_NMSUB, N,Y,Y,Y,Y,N,N,N,N,N,N,Y,N,N,Y),
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FDIV_D -> List(FCMD_DIV, N,Y,Y,Y,N,N,N,N,N,N,N,N,Y,N,Y),
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FSQRT_D -> List(FCMD_SQRT, N,Y,Y,N,N,Y,X,N,N,N,N,N,N,Y,Y))
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Array(FLD -> List(Y,Y,N,N,N,X,X,X,N,N,N,N,N,N,N,N),
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FSD -> List(Y,N,N,Y,N,Y,X,N,N,N,Y,N,N,N,N,N),
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FMV_D_X -> List(N,Y,N,N,N,X,X,X,N,Y,N,N,N,N,N,N),
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FCVT_D_W -> List(N,Y,N,N,N,X,X,N,N,Y,N,N,N,N,N,Y),
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FCVT_D_WU-> List(N,Y,N,N,N,X,X,N,N,Y,N,N,N,N,N,Y),
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FCVT_D_L -> List(N,Y,N,N,N,X,X,N,N,Y,N,N,N,N,N,Y),
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FCVT_D_LU-> List(N,Y,N,N,N,X,X,N,N,Y,N,N,N,N,N,Y),
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FMV_X_D -> List(N,N,Y,N,N,N,X,N,N,N,Y,N,N,N,N,N),
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FCLASS_D -> List(N,N,Y,N,N,N,X,N,N,N,Y,N,N,N,N,N),
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FCVT_W_D -> List(N,N,Y,N,N,N,X,N,N,N,Y,N,N,N,N,Y),
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FCVT_WU_D-> List(N,N,Y,N,N,N,X,N,N,N,Y,N,N,N,N,Y),
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FCVT_L_D -> List(N,N,Y,N,N,N,X,N,N,N,Y,N,N,N,N,Y),
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FCVT_LU_D-> List(N,N,Y,N,N,N,X,N,N,N,Y,N,N,N,N,Y),
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FCVT_S_D -> List(N,Y,Y,N,N,N,X,N,Y,N,N,Y,N,N,N,Y),
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FCVT_D_S -> List(N,Y,Y,N,N,N,X,Y,N,N,N,Y,N,N,N,Y),
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FEQ_D -> List(N,N,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,Y),
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FLT_D -> List(N,N,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,Y),
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FLE_D -> List(N,N,Y,Y,N,N,N,N,N,N,Y,N,N,N,N,Y),
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FSGNJ_D -> List(N,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,N,N),
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FSGNJN_D -> List(N,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,N,N),
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FSGNJX_D -> List(N,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,N,N),
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FMIN_D -> List(N,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,N,Y),
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FMAX_D -> List(N,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,N,Y),
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FADD_D -> List(N,Y,Y,Y,N,N,Y,N,N,N,N,N,Y,N,N,Y),
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FSUB_D -> List(N,Y,Y,Y,N,N,Y,N,N,N,N,N,Y,N,N,Y),
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FMUL_D -> List(N,Y,Y,Y,N,N,N,N,N,N,N,N,Y,N,N,Y),
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FMADD_D -> List(N,Y,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,Y),
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FMSUB_D -> List(N,Y,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,Y),
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FNMADD_D -> List(N,Y,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,Y),
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FNMSUB_D -> List(N,Y,Y,Y,Y,N,N,N,N,N,N,N,Y,N,N,Y),
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FDIV_D -> List(N,Y,Y,Y,N,N,N,N,N,N,N,N,N,Y,N,Y),
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FSQRT_D -> List(N,Y,Y,N,N,Y,X,N,N,N,N,N,N,N,Y,Y))
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val insns = fLen match {
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case 32 => f
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@ -143,9 +123,9 @@ class FPUDecoder(implicit p: Parameters) extends FPUModule()(p) {
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}
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val decoder = DecodeLogic(io.inst, default, insns)
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val s = io.sigs
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val sigs = Seq(s.cmd, s.ldst, s.wen, s.ren1, s.ren2, s.ren3, s.swap12,
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s.swap23, s.single, s.fromint, s.toint, s.fastpipe, s.fma,
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s.div, s.sqrt, s.wflags)
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val sigs = Seq(s.ldst, s.wen, s.ren1, s.ren2, s.ren3, s.swap12,
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s.swap23, s.singleIn, s.singleOut, s.fromint, s.toint,
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s.fastpipe, s.fma, s.div, s.sqrt, s.wflags)
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sigs zip decoder map {case(s,d) => s := d}
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}
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@ -183,11 +163,12 @@ class FPUIO(implicit p: Parameters) extends FPUCoreIO ()(p) {
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class FPResult(implicit p: Parameters) extends CoreBundle()(p) {
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val data = Bits(width = fLen+1)
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val exc = Bits(width = 5)
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val exc = Bits(width = FPConstants.FLAGS_SZ)
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}
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class FPInput(implicit p: Parameters) extends CoreBundle()(p) with HasFPUCtrlSigs {
|
||||
val rm = Bits(width = 3)
|
||||
val rm = Bits(width = FPConstants.RM_SZ)
|
||||
val fmaCmd = Bits(width = 2)
|
||||
val typ = Bits(width = 2)
|
||||
val in1 = Bits(width = fLen+1)
|
||||
val in2 = Bits(width = fLen+1)
|
||||
|
|
@ -221,99 +202,187 @@ object ClassifyRecFN {
|
|||
}
|
||||
}
|
||||
|
||||
object IsNaNRecFN {
|
||||
def apply(in: UInt, t: FType) = in(t.sig + t.exp - 1, t.sig + t.exp - 3).andR
|
||||
}
|
||||
case class FType(exp: Int, sig: Int) {
|
||||
def ieeeWidth = exp + sig
|
||||
def recodedWidth = ieeeWidth + 1
|
||||
|
||||
object IsSNaNRecFN {
|
||||
def apply(in: UInt, t: FType) = IsNaNRecFN(in, t) && !in(t.sig - 2)
|
||||
}
|
||||
def qNaN = UInt((BigInt(7) << (exp + sig - 3)) + (BigInt(1) << (sig - 2)), exp + sig + 1)
|
||||
def isNaN(x: UInt) = x(sig + exp - 1, sig + exp - 3).andR
|
||||
def isSNaN(x: UInt) = isNaN(x) && !x(sig - 2)
|
||||
|
||||
class FType(val exp: Int, val sig: Int)
|
||||
// convert between formats, ignoring rounding, range, NaN
|
||||
def unsafeConvert(x: UInt, to: FType) = if (this == to) x else {
|
||||
val sign = x(sig + exp)
|
||||
val fractIn = x(sig - 2, 0)
|
||||
val expIn = x(sig + exp - 1, sig - 1)
|
||||
val fractOut = fractIn << to.sig >> sig
|
||||
val expOut = {
|
||||
val expCode = expIn(exp, exp - 2)
|
||||
val commonCase = (expIn + (1 << to.exp)) - (1 << exp)
|
||||
Mux(expCode === 0 || expCode >= 6, Cat(expCode, commonCase(to.exp - 3, 0)), commonCase(to.exp, 0))
|
||||
}
|
||||
Cat(sign, expOut, fractOut)
|
||||
}
|
||||
|
||||
def recode(x: UInt) = hardfloat.recFNFromFN(exp, sig, x)
|
||||
def ieee(x: UInt) = hardfloat.fNFromRecFN(exp, sig, x)
|
||||
}
|
||||
|
||||
object FType {
|
||||
val S = new FType(8, 24)
|
||||
val D = new FType(11, 53)
|
||||
}
|
||||
|
||||
/** Format conversion without rounding or NaN handling */
|
||||
object RecFNToRecFN_noncompliant {
|
||||
def apply(in: UInt, inExpWidth: Int, inSigWidth: Int, outExpWidth: Int, outSigWidth: Int) = {
|
||||
val sign = in(inSigWidth + inExpWidth)
|
||||
val fractIn = in(inSigWidth - 2, 0)
|
||||
val expIn = in(inSigWidth + inExpWidth - 1, inSigWidth - 1)
|
||||
val fractOut = fractIn << outSigWidth >> inSigWidth
|
||||
val expOut = {
|
||||
val expCode = expIn(inExpWidth, inExpWidth - 2)
|
||||
val commonCase = (expIn + (1 << outExpWidth)) - (1 << inExpWidth)
|
||||
Mux(expCode === 0 || expCode >= 6, Cat(expCode, commonCase(outExpWidth - 3, 0)),
|
||||
commonCase(outExpWidth, 0))
|
||||
}
|
||||
Cat(sign, expOut, fractOut)
|
||||
}
|
||||
}
|
||||
|
||||
object CanonicalNaN {
|
||||
def apply(t: FType): UInt =
|
||||
UInt((BigInt(7) << (t.exp + t.sig - 3)) + (BigInt(1) << (t.sig - 2)), t.exp + t.sig + 1)
|
||||
def signaling(t: FType): UInt =
|
||||
UInt((BigInt(7) << (t.exp + t.sig - 3)) + (BigInt(1) << (t.sig - 3)), t.exp + t.sig + 1)
|
||||
val all = List(S, D)
|
||||
}
|
||||
|
||||
trait HasFPUParameters {
|
||||
val fLen: Int
|
||||
val (sExpWidth, sSigWidth) = (FType.S.exp, FType.S.sig)
|
||||
val (dExpWidth, dSigWidth) = (FType.D.exp, FType.D.sig)
|
||||
val floatTypes = fLen match {
|
||||
case 32 => List(FType.S)
|
||||
case 64 => List(FType.S, FType.D)
|
||||
}
|
||||
val maxType = floatTypes.sortWith(_.exp > _.exp).head
|
||||
val floatTypes = FType.all.filter(_.ieeeWidth <= fLen)
|
||||
val maxType = floatTypes.last
|
||||
def prevType(t: FType) = floatTypes(floatTypes.indexOf(t) - 1)
|
||||
val maxExpWidth = maxType.exp
|
||||
val maxSigWidth = maxType.sig
|
||||
|
||||
def expand(x: UInt, t: FType) = RecFNToRecFN_noncompliant(x, t.exp, t.sig, maxType.exp, maxType.sig)
|
||||
def contract(x: UInt, t: FType) = RecFNToRecFN_noncompliant(x, maxType.exp, maxType.sig, t.exp, t.sig)
|
||||
private def isBox(x: UInt, t: FType): Bool = x(t.sig + t.exp, t.sig + t.exp - 4).andR
|
||||
|
||||
private def box(x: UInt, xt: FType, y: UInt, yt: FType): UInt = {
|
||||
require(xt.ieeeWidth == 2 * yt.ieeeWidth)
|
||||
val swizzledNaN = Cat(
|
||||
x(xt.sig + xt.exp, xt.sig + xt.exp - 3),
|
||||
x(xt.sig - 2, yt.recodedWidth - 1).andR,
|
||||
x(xt.sig + xt.exp - 5, xt.sig),
|
||||
y(yt.recodedWidth - 2),
|
||||
x(xt.sig - 2, yt.recodedWidth - 1),
|
||||
y(yt.recodedWidth - 1),
|
||||
y(yt.recodedWidth - 3, 0))
|
||||
Mux(xt.isNaN(x), swizzledNaN, x)
|
||||
}
|
||||
|
||||
// implement NaN unboxing for FU inputs
|
||||
def unbox(x: UInt, tag: UInt): UInt = {
|
||||
def helper(x: UInt, t: FType): Seq[(Bool, UInt)] = {
|
||||
val prev =
|
||||
if (floatTypes.indexOf(t) == 0) {
|
||||
Seq()
|
||||
} else {
|
||||
val prevT = prevType(t)
|
||||
val unswizzled = Cat(
|
||||
x(prevT.sig + prevT.exp - 1),
|
||||
x(t.sig - 1),
|
||||
x(prevT.sig + prevT.exp - 2, 0))
|
||||
val prev = helper(unswizzled, prevT)
|
||||
val isbox = isBox(x, t)
|
||||
prev.map(p => (isbox && p._1, p._2))
|
||||
}
|
||||
prev :+ (true.B, t.unsafeConvert(x, maxType))
|
||||
}
|
||||
|
||||
val res = helper(x, maxType)
|
||||
val oks = res.map(_._1)
|
||||
val floats = res.map(_._2)
|
||||
Mux(oks(tag), floats(tag), maxType.qNaN)
|
||||
}
|
||||
|
||||
// make sure that the redundant bits in the NaN-boxed encoding are consistent
|
||||
def consistent(x: UInt): Bool = {
|
||||
def helper(x: UInt, t: FType): Bool = if (floatTypes.indexOf(t) == 0) true.B else {
|
||||
val prevT = prevType(t)
|
||||
val unswizzled = Cat(
|
||||
x(prevT.sig + prevT.exp - 1),
|
||||
x(t.sig - 1),
|
||||
x(prevT.sig + prevT.exp - 2, 0))
|
||||
val prevOK = !isBox(x, t) || helper(unswizzled, prevT)
|
||||
val curOK = !t.isNaN(x) || x(t.sig + t.exp - 4) === x(t.sig - 2, prevT.recodedWidth - 1).andR
|
||||
prevOK && curOK
|
||||
}
|
||||
helper(x, maxType)
|
||||
}
|
||||
|
||||
// generate a NaN box from an FU result
|
||||
def box(x: UInt, tag: UInt): UInt = {
|
||||
def helper(y: UInt, yt: FType): UInt = {
|
||||
if (yt == maxType) {
|
||||
y
|
||||
} else {
|
||||
val nt = floatTypes(floatTypes.indexOf(yt) + 1)
|
||||
val bigger = box(UInt((BigInt(1) << nt.recodedWidth)-1), nt, y, yt)
|
||||
bigger | UInt((BigInt(1) << maxType.recodedWidth) - (BigInt(1) << nt.recodedWidth))
|
||||
}
|
||||
}
|
||||
val opts = floatTypes.map(t => helper(x, t))
|
||||
opts(tag)
|
||||
}
|
||||
|
||||
// zap bits that hardfloat thinks are don't-cares, but we do care about
|
||||
def sanitizeNaN(x: UInt, t: FType): UInt = {
|
||||
if (floatTypes.indexOf(t) == 0) {
|
||||
x
|
||||
} else {
|
||||
val maskedNaN = x & ~UInt((BigInt(1) << (t.sig-1)) | (BigInt(1) << (t.sig+t.exp-4)), t.recodedWidth)
|
||||
Mux(t.isNaN(x), maskedNaN, x)
|
||||
}
|
||||
}
|
||||
|
||||
// implement NaN boxing and recoding for FL*/fmv.*.x
|
||||
def recode(x: UInt, tag: UInt): UInt = {
|
||||
def helper(x: UInt, t: FType): UInt = {
|
||||
if (floatTypes.indexOf(t) == 0) {
|
||||
t.recode(x)
|
||||
} else {
|
||||
val prevT = prevType(t)
|
||||
box(t.recode(x), t, helper(x, prevT), prevT)
|
||||
}
|
||||
}
|
||||
|
||||
// fill MSBs of subword loads to emulate a wider load of a NaN-boxed value
|
||||
val boxes = floatTypes.map(t => UInt((BigInt(1) << maxType.ieeeWidth) - (BigInt(1) << t.ieeeWidth)))
|
||||
helper(boxes(tag) | x, maxType)
|
||||
}
|
||||
|
||||
// implement NaN unboxing and un-recoding for FS*/fmv.x.*
|
||||
def ieee(x: UInt, t: FType = maxType): UInt = {
|
||||
if (floatTypes.indexOf(t) == 0) {
|
||||
t.ieee(x)
|
||||
} else {
|
||||
val unrecoded = t.ieee(x)
|
||||
val prevT = prevType(t)
|
||||
val prevRecoded = Cat(
|
||||
x(prevT.recodedWidth-2),
|
||||
x(t.sig-1),
|
||||
x(prevT.recodedWidth-3, 0))
|
||||
val prevUnrecoded = ieee(prevRecoded, prevT)
|
||||
Cat(unrecoded >> prevT.ieeeWidth, Mux(t.isNaN(x), prevUnrecoded, unrecoded(prevT.ieeeWidth-1, 0)))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
abstract class FPUModule(implicit p: Parameters) extends CoreModule()(p) with HasFPUParameters
|
||||
|
||||
class FPToInt(implicit p: Parameters) extends FPUModule()(p) {
|
||||
class Output extends Bundle {
|
||||
val in = new FPInput
|
||||
val lt = Bool()
|
||||
val store = Bits(width = fLen)
|
||||
val toint = Bits(width = xLen)
|
||||
val exc = Bits(width = 5)
|
||||
val exc = Bits(width = FPConstants.FLAGS_SZ)
|
||||
override def cloneType = new Output().asInstanceOf[this.type]
|
||||
}
|
||||
val io = new Bundle {
|
||||
val in = Valid(new FPInput).flip
|
||||
val as_double = new FPInput().asOutput
|
||||
val out = Valid(new Output)
|
||||
}
|
||||
|
||||
val in = RegEnable(io.in.bits, io.in.valid)
|
||||
val valid = Reg(next=io.in.valid)
|
||||
|
||||
val in1_s = contract(in.in1, FType.S)
|
||||
val unrec_s = hardfloat.fNFromRecFN(sExpWidth, sSigWidth, in1_s).sextTo(xLen)
|
||||
val unrec_mem = fLen match {
|
||||
case 32 => unrec_s
|
||||
case 64 =>
|
||||
val unrec_d = hardfloat.fNFromRecFN(dExpWidth, dSigWidth, in.in1).sextTo(xLen)
|
||||
Mux(in.single, unrec_s, unrec_d)
|
||||
}
|
||||
val unrec_int = xLen match {
|
||||
case 32 => unrec_s
|
||||
case fLen => unrec_mem
|
||||
}
|
||||
|
||||
val classify_s = ClassifyRecFN(sExpWidth, sSigWidth, in1_s)
|
||||
val classify_s = ClassifyRecFN(sExpWidth, sSigWidth, maxType.unsafeConvert(in.in1, FType.S))
|
||||
val classify_out = fLen match {
|
||||
case 32 => classify_s
|
||||
case 64 =>
|
||||
val classify_d = ClassifyRecFN(dExpWidth, dSigWidth, in.in1)
|
||||
Mux(in.single, classify_s, classify_d)
|
||||
Mux(in.singleIn, classify_s, classify_d)
|
||||
}
|
||||
|
||||
val dcmp = Module(new hardfloat.CompareRecFN(maxExpWidth, maxSigWidth))
|
||||
|
|
@ -321,32 +390,34 @@ class FPToInt(implicit p: Parameters) extends FPUModule()(p) {
|
|||
dcmp.io.b := in.in2
|
||||
dcmp.io.signaling := !in.rm(1)
|
||||
|
||||
io.out.bits.toint := Mux(in.rm(0), classify_out, unrec_int)
|
||||
io.out.bits.store := unrec_mem
|
||||
val store = ieee(in.in1)
|
||||
val toint = Mux(in.rm(0), classify_out, store)
|
||||
io.out.bits.store := store
|
||||
io.out.bits.toint := Mux(in.singleOut, toint(31, 0).sextTo(xLen), toint)
|
||||
io.out.bits.exc := Bits(0)
|
||||
|
||||
when (in.cmd === FCMD_CMP) {
|
||||
when (in.wflags) { // feq/flt/fle, fcvt
|
||||
io.out.bits.toint := (~in.rm & Cat(dcmp.io.lt, dcmp.io.eq)).orR
|
||||
io.out.bits.exc := dcmp.io.exceptionFlags
|
||||
}
|
||||
when (in.cmd === FCMD_CVT_IF) {
|
||||
val minXLen = 32
|
||||
val n = log2Ceil(xLen/minXLen) + 1
|
||||
for (i <- 0 until n) {
|
||||
val conv = Module(new hardfloat.RecFNToIN(maxExpWidth, maxSigWidth, minXLen << i))
|
||||
conv.io.in := in.in1
|
||||
conv.io.roundingMode := in.rm
|
||||
conv.io.signedOut := ~in.typ(0)
|
||||
when (in.typ.extract(log2Ceil(n), 1) === i) {
|
||||
io.out.bits.toint := conv.io.out.sextTo(xLen)
|
||||
io.out.bits.exc := Cat(conv.io.intExceptionFlags(2, 1).orR, UInt(0, 3), conv.io.intExceptionFlags(0))
|
||||
when (!in.ren2) { // fcvt
|
||||
val minXLen = 32
|
||||
val n = log2Ceil(xLen/minXLen) + 1
|
||||
for (i <- 0 until n) {
|
||||
val conv = Module(new hardfloat.RecFNToIN(maxExpWidth, maxSigWidth, minXLen << i))
|
||||
conv.io.in := in.in1
|
||||
conv.io.roundingMode := in.rm
|
||||
conv.io.signedOut := ~in.typ(0)
|
||||
when (in.typ.extract(log2Ceil(n), 1) === i) {
|
||||
io.out.bits.toint := conv.io.out.sextTo(xLen)
|
||||
io.out.bits.exc := Cat(conv.io.intExceptionFlags(2, 1).orR, UInt(0, 3), conv.io.intExceptionFlags(0))
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
io.out.valid := valid
|
||||
io.out.bits.lt := dcmp.io.lt
|
||||
io.as_double := in
|
||||
io.out.bits.in := in
|
||||
}
|
||||
|
||||
class IntToFP(val latency: Int)(implicit p: Parameters) extends FPUModule()(p) {
|
||||
|
|
@ -359,10 +430,7 @@ class IntToFP(val latency: Int)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
|
||||
val mux = Wire(new FPResult)
|
||||
mux.exc := Bits(0)
|
||||
mux.data := expand(hardfloat.recFNFromFN(sExpWidth, sSigWidth, in.bits.in1), FType.S)
|
||||
if (fLen > 32) when (!in.bits.single) {
|
||||
mux.data := hardfloat.recFNFromFN(dExpWidth, dSigWidth, in.bits.in1)
|
||||
}
|
||||
mux.data := recode(in.bits.in1, !in.bits.singleIn)
|
||||
|
||||
val intValue = {
|
||||
val minXLen = 32
|
||||
|
|
@ -377,12 +445,12 @@ class IntToFP(val latency: Int)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
res.asUInt
|
||||
}
|
||||
|
||||
when (in.bits.cmd === FCMD_CVT_FI) {
|
||||
when (in.bits.wflags) { // fcvt
|
||||
val l2s = Module(new hardfloat.INToRecFN(xLen, sExpWidth, sSigWidth))
|
||||
l2s.io.signedIn := ~in.bits.typ(0)
|
||||
l2s.io.in := intValue
|
||||
l2s.io.roundingMode := in.bits.rm
|
||||
mux.data := expand(l2s.io.out, FType.S)
|
||||
mux.data := sanitizeNaN(l2s.io.out, FType.S)
|
||||
mux.exc := l2s.io.exceptionFlags
|
||||
|
||||
fLen match {
|
||||
|
|
@ -392,8 +460,9 @@ class IntToFP(val latency: Int)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
l2d.io.signedIn := ~in.bits.typ(0)
|
||||
l2d.io.in := intValue
|
||||
l2d.io.roundingMode := in.bits.rm
|
||||
when (!in.bits.single) {
|
||||
mux.data := l2d.io.out
|
||||
mux.data := Cat(l2d.io.out >> l2s.io.out.getWidth, l2s.io.out)
|
||||
when (!in.bits.singleIn) {
|
||||
mux.data := sanitizeNaN(l2d.io.out, FType.D)
|
||||
mux.exc := l2d.io.exceptionFlags
|
||||
}
|
||||
}
|
||||
|
|
@ -414,37 +483,46 @@ class FPToFP(val latency: Int)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
val signNum = Mux(in.bits.rm(1), in.bits.in1 ^ in.bits.in2, Mux(in.bits.rm(0), ~in.bits.in2, in.bits.in2))
|
||||
val fsgnj = Cat(signNum(fLen), in.bits.in1(fLen-1, 0))
|
||||
|
||||
val mux = Wire(new FPResult)
|
||||
mux.exc := UInt(0)
|
||||
mux.data := fsgnj
|
||||
val fsgnjMux = Wire(new FPResult)
|
||||
fsgnjMux.exc := UInt(0)
|
||||
fsgnjMux.data := fsgnj
|
||||
|
||||
when (in.bits.cmd === FCMD_MINMAX) {
|
||||
val isnan1 = IsNaNRecFN(in.bits.in1, maxType)
|
||||
val isnan2 = IsNaNRecFN(in.bits.in2, maxType)
|
||||
val isInvalid = IsSNaNRecFN(in.bits.in1, maxType) || IsSNaNRecFN(in.bits.in2, maxType)
|
||||
when (in.bits.wflags) { // fmin/fmax
|
||||
val isnan1 = maxType.isNaN(in.bits.in1)
|
||||
val isnan2 = maxType.isNaN(in.bits.in2)
|
||||
val isInvalid = maxType.isSNaN(in.bits.in1) || maxType.isSNaN(in.bits.in2)
|
||||
val isNaNOut = isInvalid || (isnan1 && isnan2)
|
||||
val isLHS = isnan2 || in.bits.rm(0) =/= io.lt && !isnan1
|
||||
mux.exc := isInvalid << 4
|
||||
mux.data := Mux(isNaNOut, CanonicalNaN(maxType), Mux(isLHS, in.bits.in1, in.bits.in2))
|
||||
fsgnjMux.exc := isInvalid << 4
|
||||
fsgnjMux.data := Mux(isNaNOut, maxType.qNaN, Mux(isLHS, in.bits.in1, in.bits.in2))
|
||||
}
|
||||
|
||||
val mux = Wire(new FPResult)
|
||||
mux.exc := fsgnjMux.exc
|
||||
|
||||
fLen match {
|
||||
case 32 =>
|
||||
mux.data := fsgnjMux.data
|
||||
case 64 =>
|
||||
when (in.bits.cmd === FCMD_CVT_FF) {
|
||||
val fsgnjSingle = maxType.unsafeConvert(fsgnjMux.data, FType.S)
|
||||
mux.data := Mux(in.bits.singleOut, Cat(fsgnjMux.data >> fsgnjSingle.getWidth, fsgnjSingle), fsgnjMux.data)
|
||||
|
||||
when (in.bits.wflags && !in.bits.ren2) { // fcvt
|
||||
val d2s = Module(new hardfloat.RecFNToRecFN(dExpWidth, dSigWidth, sExpWidth, sSigWidth))
|
||||
d2s.io.in := in.bits.in1
|
||||
d2s.io.roundingMode := in.bits.rm
|
||||
val d2sOut = sanitizeNaN(d2s.io.out, FType.S)
|
||||
|
||||
val s2d = Module(new hardfloat.RecFNToRecFN(sExpWidth, sSigWidth, dExpWidth, dSigWidth))
|
||||
s2d.io.in := contract(in.bits.in1, FType.S)
|
||||
s2d.io.in := maxType.unsafeConvert(in.bits.in1, FType.S)
|
||||
s2d.io.roundingMode := in.bits.rm
|
||||
val s2dOut = sanitizeNaN(s2d.io.out, FType.D)
|
||||
|
||||
when (in.bits.single) {
|
||||
mux.data := expand(d2s.io.out, FType.S)
|
||||
when (in.bits.singleOut) {
|
||||
mux.data := Cat(s2dOut >> d2sOut.getWidth, d2sOut)
|
||||
mux.exc := d2s.io.exceptionFlags
|
||||
}.otherwise {
|
||||
mux.data := s2d.io.out
|
||||
mux.data := s2dOut
|
||||
mux.exc := s2d.io.exceptionFlags
|
||||
}
|
||||
}
|
||||
|
|
@ -459,31 +537,29 @@ class FPUFMAPipe(val latency: Int, t: FType)(implicit p: Parameters) extends FPU
|
|||
val out = Valid(new FPResult)
|
||||
}
|
||||
|
||||
val width = t.sig + t.exp
|
||||
val one = UInt(1) << (width-1)
|
||||
val zero = (io.in.bits.in1(width) ^ io.in.bits.in2(width)) << width
|
||||
|
||||
val valid = Reg(next=io.in.valid)
|
||||
val in = Reg(new FPInput)
|
||||
when (io.in.valid) {
|
||||
val signProd = io.in.bits.in1(maxType.sig + maxType.exp) ^ io.in.bits.in2(maxType.sig + maxType.exp)
|
||||
val one = UInt(1) << (t.sig + t.exp - 1)
|
||||
val zero = signProd << (t.sig + t.exp)
|
||||
val cmd_fma = io.in.bits.ren3
|
||||
val cmd_addsub = io.in.bits.swap23
|
||||
in := io.in.bits
|
||||
in.in1 := contract(io.in.bits.in1, t)
|
||||
in.in2 := Mux(cmd_addsub, one, contract(io.in.bits.in2, t))
|
||||
in.in3 := Mux(cmd_fma || cmd_addsub, contract(io.in.bits.in3, t), zero)
|
||||
in.cmd := Cat(io.in.bits.cmd(1) & (cmd_fma || cmd_addsub), io.in.bits.cmd(0))
|
||||
in.in1 := maxType.unsafeConvert(io.in.bits.in1, t)
|
||||
in.in2 := Mux(cmd_addsub, one, maxType.unsafeConvert(io.in.bits.in2, t))
|
||||
in.in3 := Mux(cmd_fma || cmd_addsub, maxType.unsafeConvert(io.in.bits.in3, t), zero)
|
||||
}
|
||||
|
||||
val fma = Module(new hardfloat.MulAddRecFN(t.exp, t.sig))
|
||||
fma.io.op := in.cmd
|
||||
fma.io.op := in.fmaCmd
|
||||
fma.io.roundingMode := in.rm
|
||||
fma.io.a := in.in1
|
||||
fma.io.b := in.in2
|
||||
fma.io.c := in.in3
|
||||
|
||||
val res = Wire(new FPResult)
|
||||
res.data := expand(fma.io.out, t)
|
||||
res.data := sanitizeNaN(fma.io.out, t)
|
||||
res.exc := fma.io.exceptionFlags
|
||||
io.out := Pipe(valid, res, latency-1)
|
||||
}
|
||||
|
|
@ -517,23 +593,18 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
|
||||
// load response
|
||||
val load_wb = Reg(next=io.dmem_resp_val)
|
||||
val load_wb_single = RegEnable(!io.dmem_resp_type(0), io.dmem_resp_val)
|
||||
val load_wb_double = RegEnable(io.dmem_resp_type(0), io.dmem_resp_val)
|
||||
val load_wb_data = RegEnable(io.dmem_resp_data, io.dmem_resp_val)
|
||||
val load_wb_tag = RegEnable(io.dmem_resp_tag, io.dmem_resp_val)
|
||||
val rec_s = hardfloat.recFNFromFN(sExpWidth, sSigWidth, load_wb_data)
|
||||
val load_wb_data_recoded = fLen match {
|
||||
case 32 => rec_s
|
||||
case 64 =>
|
||||
val rec_d = hardfloat.recFNFromFN(dExpWidth, dSigWidth, load_wb_data)
|
||||
Mux(load_wb_single, expand(rec_s, FType.S), rec_d)
|
||||
}
|
||||
|
||||
// regfile
|
||||
val regfile = Mem(32, Bits(width = fLen+1))
|
||||
when (load_wb) {
|
||||
regfile(load_wb_tag) := load_wb_data_recoded
|
||||
val wdata = recode(load_wb_data, load_wb_double)
|
||||
regfile(load_wb_tag) := wdata
|
||||
assert(consistent(wdata))
|
||||
if (enableCommitLog)
|
||||
printf("f%d p%d 0x%x\n", load_wb_tag, load_wb_tag + 32, Mux(load_wb_single, load_wb_data(31,0), load_wb_data))
|
||||
printf("f%d p%d 0x%x\n", load_wb_tag, load_wb_tag + 32, load_wb_data)
|
||||
}
|
||||
|
||||
val ex_ra1::ex_ra2::ex_ra3::Nil = List.fill(3)(Reg(UInt()))
|
||||
|
|
@ -552,12 +623,14 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
val ex_rm = Mux(ex_reg_inst(14,12) === Bits(7), io.fcsr_rm, ex_reg_inst(14,12))
|
||||
|
||||
val req = Wire(new FPInput)
|
||||
def readAndUnbox(addr: UInt) = unbox(regfile(addr), !ex_ctrl.singleIn)
|
||||
req := ex_ctrl
|
||||
req.rm := ex_rm
|
||||
req.in1 := regfile(ex_ra1)
|
||||
req.in2 := regfile(ex_ra2)
|
||||
req.in3 := regfile(ex_ra3)
|
||||
req.in1 := readAndUnbox(ex_ra1)
|
||||
req.in2 := readAndUnbox(ex_ra2)
|
||||
req.in3 := readAndUnbox(ex_ra3)
|
||||
req.typ := ex_reg_inst(21,20)
|
||||
req.fmaCmd := ex_reg_inst(3,2) | (!ex_ctrl.ren3 && ex_reg_inst(27))
|
||||
when (ex_cp_valid) {
|
||||
req := io.cp_req.bits
|
||||
when (io.cp_req.bits.swap23) {
|
||||
|
|
@ -567,11 +640,11 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
}
|
||||
|
||||
val sfma = Module(new FPUFMAPipe(cfg.sfmaLatency, FType.S))
|
||||
sfma.io.in.valid := req_valid && ex_ctrl.fma && ex_ctrl.single
|
||||
sfma.io.in.valid := req_valid && ex_ctrl.fma && ex_ctrl.singleOut
|
||||
sfma.io.in.bits := req
|
||||
|
||||
val fpiu = Module(new FPToInt)
|
||||
fpiu.io.in.valid := req_valid && (ex_ctrl.toint || ex_ctrl.div || ex_ctrl.sqrt || ex_ctrl.cmd === FCMD_MINMAX)
|
||||
fpiu.io.in.valid := req_valid && (ex_ctrl.toint || ex_ctrl.div || ex_ctrl.sqrt || (ex_ctrl.fastpipe && ex_ctrl.wflags))
|
||||
fpiu.io.in.bits := req
|
||||
io.store_data := fpiu.io.out.bits.store
|
||||
io.toint_data := fpiu.io.out.bits.toint
|
||||
|
|
@ -595,7 +668,7 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
val divSqrt_waddr = Reg(UInt(width = 5))
|
||||
val divSqrt_single = Reg(Bool())
|
||||
val divSqrt_wdata = Wire(UInt(width = fLen+1))
|
||||
val divSqrt_flags = Wire(UInt(width = 5))
|
||||
val divSqrt_flags = Wire(UInt(width = FPConstants.FLAGS_SZ))
|
||||
val divSqrt_in_flight = Reg(init=Bool(false))
|
||||
val divSqrt_killed = Reg(Bool())
|
||||
|
||||
|
|
@ -604,12 +677,12 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
val pipes = List(
|
||||
Pipe(fpmu, fpmu.latency, (c: FPUCtrlSigs) => c.fastpipe, fpmu.io.out.bits),
|
||||
Pipe(ifpu, ifpu.latency, (c: FPUCtrlSigs) => c.fromint, ifpu.io.out.bits),
|
||||
Pipe(sfma, sfma.latency, (c: FPUCtrlSigs) => c.fma && c.single, sfma.io.out.bits)) ++
|
||||
Pipe(sfma, sfma.latency, (c: FPUCtrlSigs) => c.fma && c.singleOut, sfma.io.out.bits)) ++
|
||||
(fLen > 32).option({
|
||||
val dfma = Module(new FPUFMAPipe(cfg.dfmaLatency, FType.D))
|
||||
dfma.io.in.valid := req_valid && ex_ctrl.fma && !ex_ctrl.single
|
||||
dfma.io.in.valid := req_valid && ex_ctrl.fma && !ex_ctrl.singleOut
|
||||
dfma.io.in.bits := req
|
||||
Pipe(dfma, dfma.latency, (c: FPUCtrlSigs) => c.fma && !c.single, dfma.io.out.bits)
|
||||
Pipe(dfma, dfma.latency, (c: FPUCtrlSigs) => c.fma && !c.singleOut, dfma.io.out.bits)
|
||||
})
|
||||
def latencyMask(c: FPUCtrlSigs, offset: Int) = {
|
||||
require(pipes.forall(_.lat >= offset))
|
||||
|
|
@ -643,7 +716,7 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
for (i <- 0 until maxLatency-1) {
|
||||
when (!write_port_busy && memLatencyMask(i)) {
|
||||
wbInfo(i).cp := mem_cp_valid
|
||||
wbInfo(i).single := mem_ctrl.single
|
||||
wbInfo(i).single := mem_ctrl.singleOut
|
||||
wbInfo(i).pipeid := pipeid(mem_ctrl)
|
||||
wbInfo(i).rd := mem_reg_inst(11,7)
|
||||
}
|
||||
|
|
@ -651,20 +724,14 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
}
|
||||
|
||||
val waddr = Mux(divSqrt_wen, divSqrt_waddr, wbInfo(0).rd)
|
||||
val wdata = Mux(divSqrt_wen, divSqrt_wdata, (pipes.map(_.res.data): Seq[UInt])(wbInfo(0).pipeid))
|
||||
val wdouble = Mux(divSqrt_wen, !divSqrt_single, !wbInfo(0).single)
|
||||
val wdata = box(Mux(divSqrt_wen, divSqrt_wdata, (pipes.map(_.res.data): Seq[UInt])(wbInfo(0).pipeid)), wdouble)
|
||||
val wexc = (pipes.map(_.res.exc): Seq[UInt])(wbInfo(0).pipeid)
|
||||
when ((!wbInfo(0).cp && wen(0)) || divSqrt_wen) {
|
||||
assert(consistent(wdata))
|
||||
regfile(waddr) := wdata
|
||||
if (enableCommitLog) {
|
||||
val wsingle = Mux(divSqrt_wen, divSqrt_single, wbInfo(0).single)
|
||||
val wdata_unrec_s = hardfloat.fNFromRecFN(sExpWidth, sSigWidth, contract(wdata, FType.S))
|
||||
val unrec = fLen match {
|
||||
case 32 => wdata_unrec_s
|
||||
case 64 =>
|
||||
val wdata_unrec_d = hardfloat.fNFromRecFN(dExpWidth, dSigWidth, wdata)
|
||||
Mux(wsingle, wdata_unrec_s, wdata_unrec_d)
|
||||
}
|
||||
printf("f%d p%d 0x%x\n", waddr, waddr + 32, unrec)
|
||||
printf("f%d p%d 0x%x\n", waddr, waddr + 32, ieee(wdata))
|
||||
}
|
||||
}
|
||||
when (wbInfo(0).cp && wen(0)) {
|
||||
|
|
@ -705,21 +772,21 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
val divSqrt_outValid = divSqrt.io.outValid_div || divSqrt.io.outValid_sqrt
|
||||
divSqrt.io.inValid := mem_reg_valid && (mem_ctrl.div || mem_ctrl.sqrt) && !divSqrt_in_flight
|
||||
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
|
||||
divSqrt.io.a := fpiu.io.out.bits.in.in1
|
||||
divSqrt.io.b := fpiu.io.out.bits.in.in2
|
||||
divSqrt.io.roundingMode := fpiu.io.out.bits.in.rm
|
||||
|
||||
when (divSqrt.io.inValid && divSqrt_inReady) {
|
||||
divSqrt_in_flight := true
|
||||
divSqrt_killed := killm
|
||||
divSqrt_single := mem_ctrl.single
|
||||
divSqrt_single := mem_ctrl.singleOut
|
||||
divSqrt_waddr := mem_reg_inst(11,7)
|
||||
divSqrt_rm := divSqrt.io.roundingMode
|
||||
}
|
||||
|
||||
when (divSqrt_outValid) {
|
||||
divSqrt_wen := !divSqrt_killed
|
||||
divSqrt_wdata_double := divSqrt.io.out
|
||||
divSqrt_wdata_double := sanitizeNaN(divSqrt.io.out, FType.D)
|
||||
divSqrt_in_flight := false
|
||||
divSqrt_flags_double := divSqrt.io.exceptionFlags
|
||||
}
|
||||
|
|
@ -727,7 +794,7 @@ class FPU(cfg: FPUParams)(implicit p: Parameters) extends FPUModule()(p) {
|
|||
val divSqrt_toSingle = Module(new hardfloat.RecFNToRecFN(11, 53, 8, 24))
|
||||
divSqrt_toSingle.io.in := divSqrt_wdata_double
|
||||
divSqrt_toSingle.io.roundingMode := divSqrt_rm
|
||||
divSqrt_wdata := Mux(divSqrt_single, expand(divSqrt_toSingle.io.out, FType.S), divSqrt_wdata_double)
|
||||
divSqrt_wdata := Mux(divSqrt_single, Cat(divSqrt_wdata_double >> divSqrt_toSingle.io.out.getWidth, sanitizeNaN(divSqrt_toSingle.io.out, FType.S)), divSqrt_wdata_double)
|
||||
divSqrt_flags := divSqrt_flags_double | Mux(divSqrt_single, divSqrt_toSingle.io.exceptionFlags, Bits(0))
|
||||
} else {
|
||||
when (id_ctrl.div || id_ctrl.sqrt) { io.illegal_rm := true }
|
||||
|
|
|
|||
Loading…
Reference in New Issue