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Tolerate pathological growth of optCSEHash #40056

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Merged
davidwrighton merged 4 commits into from
Jul 29, 2020
Merged

Tolerate pathological growth of optCSEHash #40056

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2cc3091
growing hash
davidwrighton Jul 28, 2020
9c68487
Use bucket size metric and fix typos
davidwrighton Jul 29, 2020
79c37e7
Fix formatting and build issues
davidwrighton Jul 29, 2020
804fdd7
Fix formatting and comments
davidwrighton Jul 29, 2020
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Use bucket size metric and fix typos
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@davidwrighton
davidwrighton committed Jul 29, 2020
commit 9c68487303060be9b120a5cc559cb92df7b9c428
1 change: 1 addition & 0 deletions src/coreclr/src/jit/compiler.h
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Original file line number Diff line number Diff line change
Expand Up @@ -6365,6 +6365,7 @@ class Compiler

static const size_t s_optCSEhashSize;
static const size_t s_optCSEhashGrowthFactor;
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@briansull briansull Jul 29, 2020

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This could be renamed to indicate that it is the initial hash table size

s_optCSEhashSize => s_optCSEhashSizeInitial

static const size_t s_optCSEhashBucketSize;
size_t optCSEhashSize; // Size of hashtable
size_t optCSEhashCount; // Number of entries in hashtable
size_t optCSEhashMaxCountBeforeResize; // Number of entries before resize
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7 changes: 4 additions & 3 deletions src/coreclr/src/jit/optcse.cpp
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Expand Up @@ -22,6 +22,7 @@ XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
/* static */
const size_t Compiler::s_optCSEhashSize = EXPSET_SZ * 2;
const size_t Compiler::s_optCSEhashGrowthFactor = 2;
const size_t Compiler::s_optCSEhashBucketSize = 4;

/*****************************************************************************
*
Expand Down Expand Up @@ -377,8 +378,8 @@ void Compiler::optValnumCSE_Init()
optCSEhash = new (this, CMK_CSE) CSEdsc*[s_optCSEhashSize]();

optCSEhashSize = s_optCSEhashSize;
optCSEhashMaxCountBeforeResize = optCSEhashSize * s_optCSEhashGrowthFactor;
optCSEhashCount = 0
optCSEhashMaxCountBeforeResize = optCSEhashSize * s_optCSEhashBucketSize;
optCSEhashCount = 0;

optCSECandidateCount = 0;
optDoCSE = false; // Stays false until we find duplicate CSE tree
Expand Down Expand Up @@ -641,7 +642,7 @@ unsigned Compiler::optValnumCSE_Index(GenTree* tree, Statement* stmt)
if (optCSEhashCount == optCSEhashMaxCountBeforeResize)
{
size_t newOptCSEhashSize = optCSEhashSize * s_optCSEhashGrowthFactor;
CSEdsc** newOptCSEhash = new (this, CMK_CSE) CSEdsc*[new_optCSEhashSize]();
CSEdsc** newOptCSEhash = new (this, CMK_CSE) CSEdsc*[newOptCSEhashSize]();

// Iterate through each existing entry, moving to the new table
CSEdsc** ptr;
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