source: icGREP/icgrep-devel/icgrep/kernels/deletion.h @ 5202

Last change on this file since 5202 was 5202, checked in by nmedfort, 2 years ago

Initial work on adding types to PabloAST and mutable Var objects.

File size: 1.8 KB
Line 
1/*
2 *  Copyright (c) 2016 International Characters.
3 *  This software is licensed to the public under the Open Software License 3.0.
4 */
5#ifndef DELETION_H
6#define DELETION_H
7
8#include "streamset.h"
9#include "interface.h"
10#include "kernel.h"
11
12
13namespace llvm { class Module; class Value;}
14
15namespace IDISA { class IDISA_Builder; }
16
17//
18// Parallel Prefix Deletion
19// see Parallel Prefix Compress in Henry S. Warren, Hacker's Delight, Chapter 7
20//
21// Given that we want to delete bits within fields of width fw, moving
22// nondeleted bits to the right, the parallel prefix compress method can
23// be applied.   This requires a preprocessing step to compute log2(fw)
24// masks that can be used to select bits to be moved in each step of the
25// algorithm.
26//
27// Deletion Mask Calculation
28
29std::vector<llvm::Value *> parallel_prefix_deletion_masks(IDISA::IDISA_Builder * iBuilder, unsigned fw, llvm::Value * del_mask);
30
31// Applying Deletion Masks to a Stream
32
33llvm::Value * apply_parallel_prefix_deletion(IDISA::IDISA_Builder * iBuilder, unsigned fw, llvm::Value * del_mask, std::vector<llvm::Value *> mv, llvm::Value * strm);
34
35using namespace parabix;
36
37namespace kernel {
38
39class DeletionKernel : public kernel::KernelBuilder {
40public:
41    DeletionKernel(IDISA::IDISA_Builder * iBuilder, unsigned fw, unsigned streamCount) :
42    KernelBuilder(iBuilder, "del",
43                  {Binding{StreamSetType(iBuilder,streamCount + 2, 1), "inputStreamSet"}},
44                  {Binding{StreamSetType(iBuilder,streamCount, 1), "outputStreamSet"},
45                   Binding{StreamSetType(iBuilder,1, 1), "deletionCounts"}},
46                  {}, {}, {}),
47    mDeletionFieldWidth(fw),
48    mStreamCount(streamCount) {}
49   
50private:
51    void generateDoBlockMethod() override;
52    void generateFinalBlockMethod() override;
53    unsigned mDeletionFieldWidth;
54    unsigned mStreamCount;
55};
56
57}
58   
59#endif
60
Note: See TracBrowser for help on using the repository browser.