LibraryFunctions.bsv
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上传日期:2014-09-22
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- // The MIT License
- //
- // Copyright (c) 2006 Nirav Dave (ndave@csail.mit.edu)
- //
- // Permission is hereby granted, free of charge, to any person obtaining a copy
- // of this software and associated documentation files (the "Software"), to deal
- // in the Software without restriction, including without limitation the rights
- // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- // copies of the Software, and to permit persons to whom the Software is
- // furnished to do so, subject to the following conditions:
- //
- // The above copyright notice and this permission notice shall be included in
- // all copies or substantial portions of the Software.
- //
- // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- // THE SOFTWARE.
- import Vector::*;
- function Bit#(1) getParity(Bit#(n) v) provisos(Add#(1, k, n));
- function Bit#(1) _xor(Bit#(1) x, Bit#(1) y);
- return (x ^ y);
- endfunction
- Vector#(n,Bit#(1)) vv = unpack(v);
- Bit#(1) parity = Vector::fold(_xor, vv);
- return(parity);
- endfunction
- function Bit#(n) reverseBits(Bit#(n) x);
- Vector#(n, Bit#(1)) vx = unpack(x);
- Vector#(n, Bit#(1)) rvx = Vector::reverse(vx);
- Bit#(n) prvx = pack(rvx);
- return(prvx);
- endfunction
- function Bit#(1) signBit(Bit#(n) x) provisos(Add#(1,k,n));
- match {.signbit,.rest} = split(x);
- return(signbit);
- endfunction
- function Vector#(sz, any_e) zipWith4(function any_e f(any_a a, any_b b, any_c c, any_d d),
- Vector#(sz, any_a) va, Vector#(sz, any_b) vb,
- Vector#(sz, any_c) vc, Vector#(sz, any_d) vd);
- Vector#(sz, any_e) ve = replicate(?);
- for(Integer i = 0; i < valueOf(sz); i = i + 1)
- ve[i] = f(va[i],vb[i],vc[i],vd[i]);
- return(ve);
- endfunction
- function Vector#(n, Bit#(m)) bitBreak(Bit#(nm) x) provisos(Mul#(n,m,nm));
- return unpack(x);
- endfunction
- function Bit#(nm) bitMerge(Vector#(n, Bit#(m)) x) provisos(Mul#(n,m,nm));
- return pack(x);
- endfunction
-
- function Vector#(n, alpha) v_truncate(Vector#(m, alpha) in) provisos(Add#(n,k,m));
- Vector#(n, alpha) retval = newVector();
- for(Integer i = valueOf(n) - 1, Integer j = valueOf(m) - 1; i >= 0; i = i - 1, j = j - 1)
- begin
- retval[i] = in[j];
- end
-
- return (retval);
- endfunction
- function Vector#(n, alpha) v_rtruncate(Vector#(m, alpha) in) provisos(Add#(n,k,m));
- Vector#(n, alpha) retval = newVector();
- for(Integer i = 0; i < valueOf(n); i = i + 1)
- begin
- retval[i] = in[i];
- end
- return (retval);
- endfunction