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[BOLT] LongJmp speedup refactoring 

Run tentativeLayoutRelocMode twice only if UseOldText option was passed.
Refactor BF loop to break on condtition met.

Differential Revision: https://reviews.llvm.org/D121825
This commit is contained in:
Vladislav Khmelevsky 2022-03-16 19:45:38 +03:00
parent 959e2f00b0
commit 5be5d0f56e
1 changed files with 23 additions and 11 deletions
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34
bolt/lib/Passes/LongJmp.cpp
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@ -322,14 +322,20 @@ uint64_t LongJmpPass::tentativeLayoutRelocMode(
uint32_t CurrentIndex = 0;
if (opts::HotFunctionsAtEnd) {
for (BinaryFunction *BF : SortedFunctions) {
if (BF->hasValidIndex() && LastHotIndex == -1u)
if (BF->hasValidIndex()) {
LastHotIndex = CurrentIndex;
break;
}
++CurrentIndex;
}
} else {
for (BinaryFunction *BF : SortedFunctions) {
if (!BF->hasValidIndex() && LastHotIndex == -1u)
if (!BF->hasValidIndex()) {
LastHotIndex = CurrentIndex;
break;
}
++CurrentIndex;
}
}
@ -386,18 +392,24 @@ void LongJmpPass::tentativeLayout(
}
// Relocation mode
uint64_t EstimatedTextSize = tentativeLayoutRelocMode(BC, SortedFunctions, 0);
uint64_t EstimatedTextSize = 0;
if (opts::UseOldText) {
EstimatedTextSize = tentativeLayoutRelocMode(BC, SortedFunctions, 0);
// Initial padding
if (opts::UseOldText && EstimatedTextSize <= BC.OldTextSectionSize) {
DotAddress = BC.OldTextSectionAddress;
uint64_t Pad = offsetToAlignment(DotAddress, llvm::Align(opts::AlignText));
if (Pad + EstimatedTextSize <= BC.OldTextSectionSize)
DotAddress += Pad;
} else {
DotAddress = alignTo(BC.LayoutStartAddress, opts::AlignText);
// Initial padding
if (EstimatedTextSize <= BC.OldTextSectionSize) {
DotAddress = BC.OldTextSectionAddress;
uint64_t Pad =
offsetToAlignment(DotAddress, llvm::Align(opts::AlignText));
if (Pad + EstimatedTextSize <= BC.OldTextSectionSize) {
DotAddress += Pad;
}
}
}
if (!EstimatedTextSize || EstimatedTextSize > BC.OldTextSectionSize)
DotAddress = alignTo(BC.LayoutStartAddress, opts::AlignText);
tentativeLayoutRelocMode(BC, SortedFunctions, DotAddress);
}