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[lld][BP] Print total size of startup symbols #145106

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Jun 23, 2025
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[lld][BP] Print total size of startup symbols #145106

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7048373
[lld][BP] Print total size of startup symbols
ellishg Jun 20, 2025
14c9f71
Fix tests
ellishg Jun 23, 2025
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54 changes: 35 additions & 19 deletions lld/include/lld/Common/BPSectionOrdererBase.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -292,45 +292,54 @@ auto BPOrderer<D>::computeOrder(
bp.run(nodesForDataCompression);
}

unsigned numStartupSections = 0;
unsigned numCodeCompressionSections = 0;
unsigned numDuplicateCodeSections = 0;
unsigned numDataCompressionSections = 0;
unsigned numDuplicateDataSections = 0;
unsigned numStartupSections = 0, startupSize = 0;
unsigned numCodeCompressionSections = 0, codeCompressionSize = 0;
unsigned numDuplicateCodeSections = 0, duplicateCodeSize = 0;
unsigned numDataCompressionSections = 0, dataCompressionSize = 0;
unsigned numDuplicateDataSections = 0, duplicateDataSize = 0;
SetVector<const Section *> orderedSections;
// Order startup functions,
for (auto &node : nodesForStartup) {
const auto *isec = sections[node.Id];
if (orderedSections.insert(isec))
if (orderedSections.insert(isec)) {
startupSize += D::getSize(*isec);
++numStartupSections;
}
}
// then functions for compression,
for (auto &node : nodesForFunctionCompression) {
const auto *isec = sections[node.Id];
if (orderedSections.insert(isec))
if (orderedSections.insert(isec)) {
codeCompressionSize += D::getSize(*isec);
++numCodeCompressionSections;

}
auto It = duplicateSectionIdxs.find(node.Id);
if (It == duplicateSectionIdxs.end())
continue;
for (auto dupSecIdx : It->getSecond()) {
const auto *dupIsec = sections[dupSecIdx];
if (orderedSections.insert(dupIsec))
if (orderedSections.insert(dupIsec)) {
duplicateCodeSize += D::getSize(*isec);
++numDuplicateCodeSections;
}
}
}
// then data for compression.
for (auto &node : nodesForDataCompression) {
const auto *isec = sections[node.Id];
if (orderedSections.insert(isec))
if (orderedSections.insert(isec)) {
dataCompressionSize += D::getSize(*isec);
++numDataCompressionSections;
}
auto It = duplicateSectionIdxs.find(node.Id);
if (It == duplicateSectionIdxs.end())
continue;
for (auto dupSecIdx : It->getSecond()) {
const auto *dupIsec = sections[dupSecIdx];
if (orderedSections.insert(dupIsec))
if (orderedSections.insert(dupIsec)) {
duplicateDataSize += D::getSize(*isec);
++numDuplicateDataSections;
}
}
}

Expand All @@ -339,14 +348,21 @@ auto BPOrderer<D>::computeOrder(
numStartupSections + numCodeCompressionSections +
numDuplicateCodeSections + numDataCompressionSections +
numDuplicateDataSections;
dbgs()
<< "Ordered " << numTotalOrderedSections
<< " sections using balanced partitioning:\n Functions for startup: "
<< numStartupSections
<< "\n Functions for compression: " << numCodeCompressionSections
<< "\n Duplicate functions: " << numDuplicateCodeSections
<< "\n Data for compression: " << numDataCompressionSections
<< "\n Duplicate data: " << numDuplicateDataSections << "\n";
unsigned totalOrderedSize = startupSize + codeCompressionSize +
duplicateCodeSize + dataCompressionSize +
duplicateDataSize;
dbgs() << "Ordered " << numTotalOrderedSections << " sections ("
<< totalOrderedSize << " bytes) using balanced partitioning:\n";
dbgs() << " Functions for startup: " << numStartupSections << " ("
<< startupSize << " bytes)\n";
dbgs() << " Functions for compression: " << numCodeCompressionSections
<< " (" << codeCompressionSize << " bytes)\n";
dbgs() << " Duplicate functions: " << numDuplicateCodeSections << " ("
<< duplicateCodeSize << " bytes)\n";
dbgs() << " Data for compression: " << numDataCompressionSections << " ("
<< dataCompressionSize << " bytes)\n";
dbgs() << " Duplicate data: " << numDuplicateDataSections << " ("
<< duplicateDataSize << " bytes)\n";

if (!profilePath.empty()) {
// Evaluate this function order for startup
Expand Down
10 changes: 5 additions & 5 deletions lld/test/ELF/bp-section-orderer.s
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Expand Up @@ -21,7 +21,7 @@
# RUN: llvm-profdata merge a.proftext -o a.profdata
# RUN: ld.lld a.o --irpgo-profile=a.profdata --bp-startup-sort=function --verbose-bp-section-orderer --icf=all --gc-sections 2>&1 | FileCheck %s --check-prefix=STARTUP-FUNC-ORDER

# STARTUP-FUNC-ORDER: Ordered 3 sections using balanced partitioning
# STARTUP-FUNC-ORDER: Ordered 3 sections ([[#]] bytes) using balanced partitioning
# STARTUP-FUNC-ORDER: Total area under the page fault curve: 3.

# RUN: ld.lld -o out.s a.o --irpgo-profile=a.profdata --bp-startup-sort=function
Expand Down Expand Up @@ -49,10 +49,10 @@
# RUN: llvm-nm -jn out.cbs | tr '\n' , | FileCheck %s --check-prefix=CBOTH-STARTUP
# CBOTH-STARTUP: s5,s3,s4,s2,s1,A,B,C,F,E,D,merged1,merged2,_start,d4,d1,d3,d2,{{$}}

# BP-COMPRESSION-FUNC: Ordered 9 sections using balanced partitioning
# BP-COMPRESSION-ICF-FUNC: Ordered 8 sections using balanced partitioning
# BP-COMPRESSION-DATA: Ordered 9 sections using balanced partitioning
# BP-COMPRESSION-BOTH: Ordered 18 sections using balanced partitioning
# BP-COMPRESSION-FUNC: Ordered 9 sections ([[#]] bytes) using balanced partitioning
# BP-COMPRESSION-ICF-FUNC: Ordered 8 sections ([[#]] bytes) using balanced partitioning
# BP-COMPRESSION-DATA: Ordered 9 sections ([[#]] bytes) using balanced partitioning
# BP-COMPRESSION-BOTH: Ordered 18 sections ([[#]] bytes) using balanced partitioning

#--- a.proftext
:ir
Expand Down
12 changes: 6 additions & 6 deletions lld/test/MachO/bp-section-orderer.s
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Original file line number Diff line number Diff line change
Expand Up @@ -9,8 +9,8 @@

# RUN: %lld -arch arm64 -lSystem -e _main -o %t/a.out %t/a.o --irpgo-profile %t/a.profdata --bp-startup-sort=function --verbose-bp-section-orderer 2>&1 | FileCheck %s --check-prefix=STARTUP
# RUN: %lld -arch arm64 -lSystem -e _main -o %t/a.out %t/a.o --irpgo-profile=%t/a.profdata --bp-startup-sort=function --verbose-bp-section-orderer --icf=all --bp-compression-sort=none 2>&1 | FileCheck %s --check-prefix=STARTUP-ICF
# STARTUP: Ordered 5 sections using balanced partitioning
# STARTUP-ICF: Ordered 4 sections using balanced partitioning
# STARTUP: Ordered 5 sections ([[#]] bytes) using balanced partitioning
# STARTUP-ICF: Ordered 4 sections ([[#]] bytes) using balanced partitioning

# Check that orderfiles take precedence over BP
# RUN: %no-fatal-warnings-lld -arch arm64 -lSystem -e _main -o - %t/a.o -order_file %t/a.orderfile --irpgo-profile-sort=%t/a.profdata | llvm-nm --numeric-sort --format=just-symbols - | FileCheck %s --check-prefix=ORDERFILE
Expand Down Expand Up @@ -50,10 +50,10 @@
# RUN: %lld -arch arm64 -lSystem -e _main -o %t/a.out %t/a.o --verbose-bp-section-orderer --bp-compression-sort=both 2>&1 | FileCheck %s --check-prefix=COMPRESSION-BOTH
# RUN: %lld -arch arm64 -lSystem -e _main -o %t/a.out %t/a.o --verbose-bp-section-orderer --bp-compression-sort=both --irpgo-profile=%t/a.profdata --bp-startup-sort=function 2>&1 | FileCheck %s --check-prefix=COMPRESSION-BOTH

# COMPRESSION-FUNC: Ordered 9 sections using balanced partitioning
# COMPRESSION-ICF-FUNC: Ordered 7 sections using balanced partitioning
# COMPRESSION-DATA: Ordered 7 sections using balanced partitioning
# COMPRESSION-BOTH: Ordered 16 sections using balanced partitioning
# COMPRESSION-FUNC: Ordered 9 sections ([[#]] bytes) using balanced partitioning
# COMPRESSION-ICF-FUNC: Ordered 7 sections ([[#]] bytes) using balanced partitioning
# COMPRESSION-DATA: Ordered 7 sections ([[#]] bytes) using balanced partitioning
# COMPRESSION-BOTH: Ordered 16 sections ([[#]] bytes) using balanced partitioning

#--- a.s
.text
Expand Down
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