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-- Highler level API to build a netlist - do some optimizations.
-- Copyright (C) 2019 Tristan Gingold
--
-- This file is part of GHDL.
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program. If not, see <gnu.org/licenses>.
with Netlists.Gates; use Netlists.Gates;
with Netlists.Builders; use Netlists.Builders;
package Netlists.Folds is
-- Build a const from VAL. Result is either a Const_UB32 or a Const_Bit.
-- VAL is zero extended, so any width is allowed.
-- But VAL must fit in the width.
function Build2_Const_Uns (Ctxt : Context_Acc; Val : Uns64; W : Width)
return Net;
-- Build a const from VAL. Result is either a Const_SB32 or a Const_Bit.
-- VAL is sign extended, so any width is allowed, but it must fit in the
-- width.
function Build2_Const_Int (Ctxt : Context_Acc; Val : Int64; W : Width)
return Net;
function Build2_Const_Vec (Ctxt : Context_Acc; W : Width; V : Uns32_Arr)
return Net;
-- Concatenate nets of ELS in reverse order. So if ELS(L .. R), then
-- ELS(L) will be at offset 0.
function Build2_Concat (Ctxt : Context_Acc; Els : Net_Array) return Net;
-- If L or R has a null width, return the other.
function Build2_Concat2 (Ctxt : Context_Acc; L, R : Net) return Net;
-- Truncate I to width W. Merge if the input is an extend.
function Build2_Trunc (Ctxt : Context_Acc;
Id : Module_Id;
I : Net;
W : Width;
Loc : Location_Type)
return Net;
-- Zero extend, noop or truncate I so that its width is W.
function Build2_Uresize (Ctxt : Context_Acc;
I : Net;
W : Width;
Loc : Location_Type)
return Net;
-- Sign extend, noop or truncate I so that its width is W.
function Build2_Sresize (Ctxt : Context_Acc;
I : Net;
W : Width;
Loc : Location_Type)
return Net;
-- If IS_SIGNED is true, this is Build2_Sresize, otherwise Build2_Uresize.
function Build2_Resize (Ctxt : Context_Acc;
I : Net;
W : Width;
Is_Signed : Boolean;
Loc : Location_Type)
return Net;
-- Same as Build_Extract, but return I iff extract all the bits.
function Build2_Extract
(Ctxt : Context_Acc; I : Net; Off, W : Width) return Net;
-- Likewise, but if I is an output of a mux2, build the extract gates
-- on the input of the mux2 (recursively).
-- The purpose is to keep the control flow of the mux2 tree.
function Build2_Extract_Push
(Ctxt : Context_Acc; I : Net; Off, W : Width) return Net;
-- Return A -> B == !A || B
function Build2_Imp (Ctxt : Context_Acc; A, B : Net; Loc : Location_Type)
return Net;
-- Return A & B.
-- If A is No_Net, simply return B so that it is possible to easily build
-- chain of conditions.
function Build2_And (Ctxt : Context_Acc; A, B : Net; Loc : Location_Type)
return Net;
-- Like Build_Compare but handle net of width 0.
function Build2_Compare (Ctxt : Context_Acc;
Id : Compare_Module_Id;
L, R : Net) return Net;
-- INST is a dyn_insert gate that will be converted to a dyn_insert_en
-- by using SEL as enable input.
-- The old dyn_insert gate is removed.
function Add_Enable_To_Dyn_Insert
(Ctxt : Context_Acc; Inst : Instance; Sel : Net) return Instance;
end Netlists.Folds;
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