source: icGREP/icgrep-devel/icgrep/kernels/deletion.h @ 5105

Last change on this file since 5105 was 5105, checked in by cameron, 3 years ago

getStreamSetBlockPtr

File size: 2.0 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 kernel;
36using namespace parabix;
37
38class deletionKernel : public kernel::KernelBuilder {
39public:
40    deletionKernel(IDISA::IDISA_Builder * iBuilder, unsigned fw, unsigned streamCount,
41                   StreamSetBuffer & inputStreamSet,
42                   StreamSetBuffer & outputStreamSet,
43                   StreamSetBuffer & deletionCounts) :
44    KernelBuilder(iBuilder, "del",
45                  {StreamSetBinding{inputStreamSet, "inputStreamSet"}},
46                  {StreamSetBinding{outputStreamSet, "outputStreamSet"},
47                   StreamSetBinding{deletionCounts, "deletionCounts"}},
48                  {}, {}, {}),
49    mDeletionFieldWidth(fw),
50    mStreamCount(streamCount) {}
51   
52private:
53    void generateDoBlockMethod() override;
54    void generateFinalBlockMethod() override;
55    unsigned mDeletionFieldWidth;
56    unsigned mStreamCount;
57};
58   
59#endif
60
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