diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/synth/synth-oper.adb | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/synth/synth-oper.adb b/src/synth/synth-oper.adb index 26017042b..a3f7be688 100644 --- a/src/synth/synth-oper.adb +++ b/src/synth/synth-oper.adb @@ -1714,6 +1714,75 @@ package body Synth.Oper is return Create_Value_Net (N, Create_Res_Bound (Left)); end Synth_Shift_Rotate; + function Synth_Find_Bit (Ctxt : Context_Acc; + Left, Right : Valtyp; + Res_Typ : Type_Acc; + Leftmost : Boolean; + Expr : Node) return Valtyp + is + pragma Assert (Left.Typ.Kind = Type_Vector); + Len : constant Uns32 := Left.Typ.Vbound.Len; + Max : Int32; + Rng : Discrete_Range_Type; + W : Uns32; + Typ : Type_Acc; + R_Net : Net; + L_Net : Net; + Res : Net; + begin + if Len = 0 then + return Create_Value_Int (-1, Res_Typ); + end if; + + -- The intermediate result is computed using the least number of bits, + -- which must represent all positive values in the bounds using a + -- signed word (so that -1 is also represented). + Max := Int32'Max (Left.Typ.Vbound.Left, Left.Typ.Vbound.Right); + W := Utils.Clog2 (Uns32 (Max)) + 1; + Rng := (Dir => Dir_To, + Is_Signed => True, + Left => -1, + Right => Int64 (Max)); + Typ := Create_Discrete_Type (Rng, Res_Typ.Sz, W); + + R_Net := Get_Net (Ctxt, Right); + L_Net := Get_Net (Ctxt, Left); + Res := Build2_Const_Int (Ctxt, -1, W); + for I in 0 .. Len - 1 loop + declare + Pos : Uns32; + V : Int64; + Sel : Net; + begin + if Leftmost then + -- Iterate from the right to the left. + Pos := I; + if Left.Typ.Vbound.Dir = Dir_To then + V := Int64 (Left.Typ.Vbound.Right) - Int64 (I); + else + V := Int64 (Left.Typ.Vbound.Right) + Int64 (I); + end if; + else + Pos := Len - I - 1; + if Left.Typ.Vbound.Dir = Dir_To then + V := Int64 (Left.Typ.Vbound.Left) + Int64 (I); + else + V := Int64 (Left.Typ.Vbound.Left) - Int64 (I); + end if; + end if; + Sel := Build2_Compare (Ctxt, Id_Eq, + Build2_Extract (Ctxt, L_Net, Pos, 1), + R_Net); + Set_Location (Sel, Expr); + Res := Build_Mux2 (Ctxt, Sel, Res, Build2_Const_Int (Ctxt, V, W)); + Set_Location (Res, Expr); + end; + end loop; + + return Synth_Subtype_Conversion (Ctxt, Create_Value_Net (Res, Typ), + Res_Typ, False, Expr); + end Synth_Find_Bit; + function Synth_Dynamic_Predefined_Function_Call (Subprg_Inst : Synth_Instance_Acc; Expr : Node) return Valtyp is @@ -1943,6 +2012,14 @@ package body Synth.Oper is return Create_Value_Net (Res, Boolean_Type); end if; end; + + when Iir_Predefined_Ieee_Numeric_Std_Find_Leftmost_Sgn + | Iir_Predefined_Ieee_Numeric_Std_Find_Leftmost_Uns => + return Synth_Find_Bit (Ctxt, L, R, Res_Typ, True, Expr); + when Iir_Predefined_Ieee_Numeric_Std_Find_Rightmost_Sgn + | Iir_Predefined_Ieee_Numeric_Std_Find_Rightmost_Uns => + return Synth_Find_Bit (Ctxt, L, R, Res_Typ, False, Expr); + when others => Error_Msg_Synth (+Expr, |