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https://github.com/VSadov/Satori.git
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JIT: Add some limits in physical promotion (#87729)
Add limits on how many fields we promote in each struct and how many
total fields we promote. These limits are put in place to avoid
pathological cases; we do not hit any of them over all of our SPMI
collections (at least on win-x64).
The limits were selected based on histograms of physical promotion stats
over our collections. Here they are for some of the important
collections:
JitEnablePhysicalPromotion=1:
benchmarks.run_pgo:
```
(Per context) How many fields are promoted:
<= 0 ===> 1654 count ( 66% of total)
1 .. 1 ===> 206 count ( 75% of total)
2 .. 2 ===> 259 count ( 85% of total)
3 .. 3 ===> 127 count ( 90% of total)
4 .. 4 ===> 46 count ( 92% of total)
5 .. 5 ===> 30 count ( 93% of total)
6 .. 10 ===> 99 count ( 97% of total)
11 .. 15 ===> 17 count ( 98% of total)
16 .. 20 ===> 21 count ( 99% of total)
21 .. 30 ===> 16 count ( 99% of total)
31 .. 40 ===> 3 count (100% of total)
41 .. 50 ===> 0 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 150 ===> 0 count (100% of total)
151 .. 200 ===> 0 count (100% of total)
201 .. 300 ===> 0 count (100% of total)
301 .. 400 ===> 0 count (100% of total)
401 .. 500 ===> 0 count (100% of total)
501 .. 700 ===> 0 count (100% of total)
701 .. 1000 ===> 0 count (100% of total)
1001 .. 2000 ===> 0 count (100% of total)
2001 .. 3000 ===> 0 count (100% of total)
3001 .. 4000 ===> 0 count (100% of total)
4001 .. 5000 ===> 0 count (100% of total)
(Per struct) How many fields are promoted:
<= 0 ===> 980 count ( 39% of total)
1 .. 1 ===> 760 count ( 69% of total)
2 .. 2 ===> 423 count ( 86% of total)
3 .. 3 ===> 73 count ( 89% of total)
4 .. 4 ===> 30 count ( 90% of total)
5 .. 5 ===> 46 count ( 92% of total)
6 .. 6 ===> 181 count ( 99% of total)
7 .. 8 ===> 2 count (100% of total)
9 .. 10 ===> 0 count (100% of total)
11 .. 15 ===> 0 count (100% of total)
16 .. 20 ===> 0 count (100% of total)
21 .. 30 ===> 0 count (100% of total)
31 .. 50 ===> 0 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 200 ===> 0 count (100% of total)
201 .. 400 ===> 0 count (100% of total)
```
libraries.pmi:
```
(Per context) How many fields are promoted:
<= 0 ===> 19677 count ( 76% of total)
1 .. 1 ===> 1717 count ( 83% of total)
2 .. 2 ===> 899 count ( 86% of total)
3 .. 3 ===> 616 count ( 89% of total)
4 .. 4 ===> 660 count ( 91% of total)
5 .. 5 ===> 285 count ( 92% of total)
6 .. 10 ===> 932 count ( 96% of total)
11 .. 15 ===> 377 count ( 98% of total)
16 .. 20 ===> 164 count ( 98% of total)
21 .. 30 ===> 165 count ( 99% of total)
31 .. 40 ===> 68 count ( 99% of total)
41 .. 50 ===> 28 count ( 99% of total)
51 .. 100 ===> 51 count ( 99% of total)
101 .. 150 ===> 14 count ( 99% of total)
151 .. 200 ===> 2 count ( 99% of total)
201 .. 300 ===> 0 count ( 99% of total)
301 .. 400 ===> 1 count (100% of total)
401 .. 500 ===> 0 count (100% of total)
501 .. 700 ===> 0 count (100% of total)
701 .. 1000 ===> 0 count (100% of total)
1001 .. 2000 ===> 0 count (100% of total)
2001 .. 3000 ===> 0 count (100% of total)
3001 .. 4000 ===> 0 count (100% of total)
4001 .. 5000 ===> 0 count (100% of total)
(Per struct) How many fields are promoted:
<= 0 ===> 6218 count ( 31% of total)
1 .. 1 ===> 5075 count ( 57% of total)
2 .. 2 ===> 1440 count ( 65% of total)
3 .. 3 ===> 1859 count ( 74% of total)
4 .. 4 ===> 2682 count ( 88% of total)
5 .. 5 ===> 974 count ( 93% of total)
6 .. 6 ===> 624 count ( 96% of total)
7 .. 8 ===> 533 count ( 99% of total)
9 .. 10 ===> 37 count ( 99% of total)
11 .. 15 ===> 65 count ( 99% of total)
16 .. 20 ===> 2 count ( 99% of total)
21 .. 30 ===> 0 count ( 99% of total)
31 .. 50 ===> 1 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 200 ===> 0 count (100% of total)
201 .. 400 ===> 0 count (100% of total)
```
realworld:
```
(Per context) How many fields are promoted:
<= 0 ===> 1807 count ( 54% of total)
1 .. 1 ===> 407 count ( 66% of total)
2 .. 2 ===> 230 count ( 73% of total)
3 .. 3 ===> 146 count ( 77% of total)
4 .. 4 ===> 122 count ( 81% of total)
5 .. 5 ===> 86 count ( 83% of total)
6 .. 10 ===> 218 count ( 90% of total)
11 .. 15 ===> 147 count ( 94% of total)
16 .. 20 ===> 59 count ( 96% of total)
21 .. 30 ===> 66 count ( 98% of total)
31 .. 40 ===> 19 count ( 98% of total)
41 .. 50 ===> 12 count ( 99% of total)
51 .. 100 ===> 14 count ( 99% of total)
101 .. 150 ===> 3 count ( 99% of total)
151 .. 200 ===> 2 count ( 99% of total)
201 .. 300 ===> 4 count ( 99% of total)
301 .. 400 ===> 0 count ( 99% of total)
401 .. 500 ===> 0 count ( 99% of total)
501 .. 700 ===> 2 count (100% of total)
701 .. 1000 ===> 0 count (100% of total)
1001 .. 2000 ===> 0 count (100% of total)
2001 .. 3000 ===> 0 count (100% of total)
3001 .. 4000 ===> 0 count (100% of total)
4001 .. 5000 ===> 0 count (100% of total)
(Per struct) How many fields are promoted:
<= 0 ===> 2012 count ( 32% of total)
1 .. 1 ===> 1421 count ( 55% of total)
2 .. 2 ===> 499 count ( 63% of total)
3 .. 3 ===> 521 count ( 71% of total)
4 .. 4 ===> 565 count ( 80% of total)
5 .. 5 ===> 446 count ( 87% of total)
6 .. 6 ===> 503 count ( 96% of total)
7 .. 8 ===> 139 count ( 98% of total)
9 .. 10 ===> 71 count ( 99% of total)
11 .. 15 ===> 34 count ( 99% of total)
16 .. 20 ===> 3 count (100% of total)
21 .. 30 ===> 0 count (100% of total)
31 .. 50 ===> 0 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 200 ===> 0 count (100% of total)
201 .. 400 ===> 0 count (100% of total)
```
JitEnablePhysicalPromotion=1;JitStressModeNames=STRESS_NO_OLD_PROMOTION:
benchmarks.run_pgo:
```
(Per context) How many fields are promoted:
<= 0 ===> 1654 count ( 66% of total)
1 .. 1 ===> 206 count ( 75% of total)
2 .. 2 ===> 259 count ( 85% of total)
3 .. 3 ===> 127 count ( 90% of total)
4 .. 4 ===> 46 count ( 92% of total)
5 .. 5 ===> 30 count ( 93% of total)
6 .. 10 ===> 99 count ( 97% of total)
11 .. 15 ===> 17 count ( 98% of total)
16 .. 20 ===> 21 count ( 99% of total)
21 .. 30 ===> 16 count ( 99% of total)
31 .. 40 ===> 3 count (100% of total)
41 .. 50 ===> 0 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 150 ===> 0 count (100% of total)
151 .. 200 ===> 0 count (100% of total)
201 .. 300 ===> 0 count (100% of total)
301 .. 400 ===> 0 count (100% of total)
401 .. 500 ===> 0 count (100% of total)
501 .. 700 ===> 0 count (100% of total)
701 .. 1000 ===> 0 count (100% of total)
1001 .. 2000 ===> 0 count (100% of total)
2001 .. 3000 ===> 0 count (100% of total)
3001 .. 4000 ===> 0 count (100% of total)
4001 .. 5000 ===> 0 count (100% of total)
(Per struct) How many fields are promoted:
<= 0 ===> 980 count ( 39% of total)
1 .. 1 ===> 760 count ( 69% of total)
2 .. 2 ===> 423 count ( 86% of total)
3 .. 3 ===> 73 count ( 89% of total)
4 .. 4 ===> 30 count ( 90% of total)
5 .. 5 ===> 46 count ( 92% of total)
6 .. 6 ===> 181 count ( 99% of total)
7 .. 8 ===> 2 count (100% of total)
9 .. 10 ===> 0 count (100% of total)
11 .. 15 ===> 0 count (100% of total)
16 .. 20 ===> 0 count (100% of total)
21 .. 30 ===> 0 count (100% of total)
31 .. 50 ===> 0 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 200 ===> 0 count (100% of total)
201 .. 400 ===> 0 count (100% of total)
```
libraries.pmi:
```
(Per context) How many fields are promoted:
<= 0 ===> 37477 count ( 48% of total)
1 .. 1 ===> 7987 count ( 58% of total)
2 .. 2 ===> 7292 count ( 68% of total)
3 .. 3 ===> 2988 count ( 72% of total)
4 .. 4 ===> 4927 count ( 78% of total)
5 .. 5 ===> 1835 count ( 81% of total)
6 .. 10 ===> 7147 count ( 90% of total)
11 .. 15 ===> 2694 count ( 93% of total)
16 .. 20 ===> 1667 count ( 95% of total)
21 .. 30 ===> 1346 count ( 97% of total)
31 .. 40 ===> 758 count ( 98% of total)
41 .. 50 ===> 335 count ( 99% of total)
51 .. 100 ===> 510 count ( 99% of total)
101 .. 150 ===> 107 count ( 99% of total)
151 .. 200 ===> 34 count ( 99% of total)
201 .. 300 ===> 12 count ( 99% of total)
301 .. 400 ===> 2 count ( 99% of total)
401 .. 500 ===> 2 count (100% of total)
501 .. 700 ===> 0 count (100% of total)
701 .. 1000 ===> 0 count (100% of total)
1001 .. 2000 ===> 0 count (100% of total)
2001 .. 3000 ===> 0 count (100% of total)
3001 .. 4000 ===> 0 count (100% of total)
4001 .. 5000 ===> 0 count (100% of total)
(Per struct) How many fields are promoted:
<= 0 ===> 102669 count ( 39% of total)
1 .. 1 ===> 57467 count ( 61% of total)
2 .. 2 ===> 69010 count ( 88% of total)
3 .. 3 ===> 11494 count ( 92% of total)
4 .. 4 ===> 16887 count ( 99% of total)
5 .. 5 ===> 1043 count ( 99% of total)
6 .. 6 ===> 618 count ( 99% of total)
7 .. 8 ===> 579 count ( 99% of total)
9 .. 10 ===> 57 count ( 99% of total)
11 .. 15 ===> 71 count ( 99% of total)
16 .. 20 ===> 5 count ( 99% of total)
21 .. 30 ===> 0 count ( 99% of total)
31 .. 50 ===> 1 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 200 ===> 0 count (100% of total)
201 .. 400 ===> 0 count (100% of total)
```
realworld:
```
(Per context) How many fields are promoted:
<= 0 ===> 5617 count ( 41% of total)
1 .. 1 ===> 1657 count ( 53% of total)
2 .. 2 ===> 1164 count ( 62% of total)
3 .. 3 ===> 522 count ( 66% of total)
4 .. 4 ===> 878 count ( 72% of total)
5 .. 5 ===> 472 count ( 76% of total)
6 .. 10 ===> 1383 count ( 86% of total)
11 .. 15 ===> 619 count ( 91% of total)
16 .. 20 ===> 335 count ( 93% of total)
21 .. 30 ===> 361 count ( 96% of total)
31 .. 40 ===> 165 count ( 97% of total)
41 .. 50 ===> 101 count ( 98% of total)
51 .. 100 ===> 177 count ( 99% of total)
101 .. 150 ===> 38 count ( 99% of total)
151 .. 200 ===> 18 count ( 99% of total)
201 .. 300 ===> 12 count ( 99% of total)
301 .. 400 ===> 1 count ( 99% of total)
401 .. 500 ===> 1 count ( 99% of total)
501 .. 700 ===> 2 count (100% of total)
701 .. 1000 ===> 0 count (100% of total)
1001 .. 2000 ===> 0 count (100% of total)
2001 .. 3000 ===> 0 count (100% of total)
3001 .. 4000 ===> 0 count (100% of total)
4001 .. 5000 ===> 0 count (100% of total)
(Per struct) How many fields are promoted:
<= 0 ===> 23630 count ( 37% of total)
1 .. 1 ===> 13267 count ( 59% of total)
2 .. 2 ===> 16731 count ( 86% of total)
3 .. 3 ===> 4677 count ( 93% of total)
4 .. 4 ===> 2727 count ( 97% of total)
5 .. 5 ===> 492 count ( 98% of total)
6 .. 6 ===> 496 count ( 99% of total)
7 .. 8 ===> 150 count ( 99% of total)
9 .. 10 ===> 92 count ( 99% of total)
11 .. 15 ===> 41 count ( 99% of total)
16 .. 20 ===> 3 count ( 99% of total)
21 .. 30 ===> 3 count ( 99% of total)
31 .. 50 ===> 3 count (100% of total)
51 .. 100 ===> 0 count (100% of total)
101 .. 200 ===> 0 count (100% of total)
201 .. 400 ===> 0 count (100% of total)
```
This commit is contained in:
Jakob Botsch Nielsen
parent
e3127c6c28
commit
feff67d5ca
GPG key ID:
4AEE18F83AFDEB23
2 changed files with 95 additions and 33 deletions
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@ -382,16 +382,22 @@ public:
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// lclNum - Local num for this struct local
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// aggregateInfo - [out] Pointer to aggregate info to create and insert replacements into.
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//
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void PickPromotions(Compiler* comp, unsigned lclNum, AggregateInfo** aggregateInfo)
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// Returns:
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// Number of promotions picked.
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//
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int PickPromotions(Compiler* comp, unsigned lclNum, AggregateInfo** aggregateInfo)
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{
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if (m_accesses.size() <= 0)
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{
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return;
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return 0;
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}
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AggregateInfo*& agg = *aggregateInfo;
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JITDUMP("Picking promotions for V%02u\n", lclNum);
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assert(*aggregateInfo == nullptr);
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assert(agg == nullptr);
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int numReps = 0;
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for (size_t i = 0; i < m_accesses.size(); i++)
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{
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const Access& access = m_accesses[i];
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@ -406,15 +412,24 @@ public:
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continue;
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}
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if (*aggregateInfo == nullptr)
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if (agg == nullptr)
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{
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*aggregateInfo = new (comp, CMK_Promotion) AggregateInfo(comp->getAllocator(CMK_Promotion), lclNum);
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agg = new (comp, CMK_Promotion) AggregateInfo(comp->getAllocator(CMK_Promotion), lclNum);
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}
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(*aggregateInfo)->Replacements.push_back(Replacement(access.Offset, access.AccessType));
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agg->Replacements.push_back(Replacement(access.Offset, access.AccessType));
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numReps++;
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if (agg->Replacements.size() >= PHYSICAL_PROMOTION_MAX_PROMOTIONS_PER_STRUCT)
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{
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JITDUMP(" Promoted %zu fields in V%02u; will not promote more\n", agg->Replacements.size(),
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agg->LclNum);
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break;
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}
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}
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JITDUMP("\n");
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return numReps;
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}
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//------------------------------------------------------------------------
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@ -427,14 +442,24 @@ public:
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// lclNum - Local num for this struct local
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// aggregateInfo - [out] Pointer to aggregate info to create and insert replacements into.
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//
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bool PickInducedPromotions(Compiler* comp, unsigned lclNum, AggregateInfo** aggregateInfo)
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// Returns:
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// Number of new promotions.
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//
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int PickInducedPromotions(Compiler* comp, unsigned lclNum, AggregateInfo** aggregateInfo)
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{
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if (m_inducedAccesses.size() <= 0)
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{
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return false;
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return 0;
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}
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bool any = false;
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AggregateInfo*& agg = *aggregateInfo;
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if ((agg != nullptr) && (agg->Replacements.size() >= PHYSICAL_PROMOTION_MAX_PROMOTIONS_PER_STRUCT))
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{
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return 0;
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}
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int numReps = 0;
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JITDUMP("Picking induced promotions for V%02u\n", lclNum);
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for (PrimitiveAccess& inducedAccess : m_inducedAccesses)
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{
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@ -483,24 +508,22 @@ public:
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}
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}
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if (*aggregateInfo == nullptr)
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if (agg == nullptr)
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{
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*aggregateInfo = new (comp, CMK_Promotion) AggregateInfo(comp->getAllocator(CMK_Promotion), lclNum);
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agg = new (comp, CMK_Promotion) AggregateInfo(comp->getAllocator(CMK_Promotion), lclNum);
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}
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size_t insertionIndex;
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if ((*aggregateInfo)->Replacements.size() > 0)
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if (agg->Replacements.size() > 0)
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{
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#ifdef DEBUG
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Replacement* overlapRep;
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assert(!(*aggregateInfo)
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->OverlappingReplacements(inducedAccess.Offset, genTypeSize(inducedAccess.AccessType),
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&overlapRep, nullptr));
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assert(!agg->OverlappingReplacements(inducedAccess.Offset, genTypeSize(inducedAccess.AccessType),
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&overlapRep, nullptr));
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#endif
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insertionIndex =
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Promotion::BinarySearch<Replacement, &Replacement::Offset>((*aggregateInfo)->Replacements,
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inducedAccess.Offset);
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Promotion::BinarySearch<Replacement, &Replacement::Offset>(agg->Replacements, inducedAccess.Offset);
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assert((ssize_t)insertionIndex < 0);
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insertionIndex = ~insertionIndex;
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}
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@ -509,13 +532,18 @@ public:
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insertionIndex = 0;
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}
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(*aggregateInfo)
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->Replacements.insert((*aggregateInfo)->Replacements.begin() + insertionIndex,
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Replacement(inducedAccess.Offset, inducedAccess.AccessType));
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any = true;
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agg->Replacements.insert(agg->Replacements.begin() + insertionIndex,
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Replacement(inducedAccess.Offset, inducedAccess.AccessType));
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numReps++;
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if (agg->Replacements.size() >= PHYSICAL_PROMOTION_MAX_PROMOTIONS_PER_STRUCT)
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{
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JITDUMP(" Promoted %zu fields in V%02u; will not promote more\n", agg->Replacements.size());
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break;
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}
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}
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return any;
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return numReps;
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}
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//------------------------------------------------------------------------
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@ -897,7 +925,21 @@ public:
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unsigned numLocals = (unsigned)aggregates.size();
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JITDUMP("Picking promotions\n");
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bool any = false;
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int totalNumPromotions = 0;
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// We limit the total number of promotions picked based on the tracking
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// limit to avoid blowup in the superlinear liveness computation in
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// pathological cases, and also because once we stop tracking the fields there is no benefit anymore.
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//
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// This logic could be improved by the use of ref counting to pick the
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// smart fields to compute liveness for, but as of writing this there
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// is no example in the built-in SPMI collections that hits this limit.
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//
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// Note that we may go slightly over this as once we start picking
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// replacement locals for a single struct we do not stop until we get
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// to the next struct, but PHYSICAL_PROMOTION_MAX_PROMOTIONS_PER_STRUCT
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// puts a limit on the number of promotions in each struct so this is
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// fine to avoid the pathological cases.
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const int maxTotalNumPromotions = JitConfig.JitMaxLocalsToTrack();
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for (unsigned lclNum = 0; lclNum < numLocals; lclNum++)
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{
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@ -914,17 +956,22 @@ public:
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}
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#endif
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uses->PickPromotions(m_compiler, lclNum, &aggregates[lclNum]);
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totalNumPromotions += uses->PickPromotions(m_compiler, lclNum, &aggregates[lclNum]);
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any |= aggregates[lclNum] != nullptr;
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if (totalNumPromotions >= maxTotalNumPromotions)
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{
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JITDUMP("Promoted %d fields which is over our limit of %d; will not promote more\n", totalNumPromotions,
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maxTotalNumPromotions);
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break;
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}
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}
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if (!any)
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if (totalNumPromotions <= 0)
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{
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return false;
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}
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if (m_candidateStores.Height() > 0)
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if ((m_candidateStores.Height() > 0) && (totalNumPromotions < maxTotalNumPromotions))
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{
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// Now look for induced accesses due to assignment decomposition.
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@ -974,7 +1021,7 @@ public:
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}
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}
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bool any = false;
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bool again = false;
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for (unsigned lclNum = 0; lclNum < numLocals; lclNum++)
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{
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LocalUses* uses = m_uses[lclNum];
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@ -989,10 +1036,20 @@ public:
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}
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#endif
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any |= uses->PickInducedPromotions(m_compiler, lclNum, &aggregates[lclNum]);
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int numInducedProms = uses->PickInducedPromotions(m_compiler, lclNum, &aggregates[lclNum]);
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again |= numInducedProms > 0;
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totalNumPromotions += numInducedProms;
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if (totalNumPromotions >= maxTotalNumPromotions)
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{
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JITDUMP("Promoted %d fields and our limit is %d; will not promote more\n", totalNumPromotions,
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maxTotalNumPromotions);
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again = false;
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break;
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}
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}
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if (!any)
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if (!again)
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{
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break;
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}
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@ -1067,11 +1124,9 @@ public:
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{
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// Aggregate is fully promoted, leave UnpromotedMin == UnpromotedMax to indicate this.
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}
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any = true;
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}
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return any;
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return totalNumPromotions > 0;
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}
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private:
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@ -7,6 +7,13 @@
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#include "compiler.h"
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#include "vector.h"
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// We limit the max number of fields that can be promoted in a single struct to
|
||||
// avoid pathological cases (e.g. machine generated code). Furthermore,
|
||||
// writebacks before struct uses introduce commas with nested trees for each
|
||||
// field written back, so without a limit we could create arbitrarily deep
|
||||
// trees.
|
||||
const int PHYSICAL_PROMOTION_MAX_PROMOTIONS_PER_STRUCT = 64;
|
||||
|
||||
// Represents a single replacement of a (field) access into a struct local.
|
||||
struct Replacement
|
||||
{
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue