Skip to content

[LoongArch] Initial implementation for enableMemCmpExpansion hook #166526

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
wants to merge 1 commit into
base: main
Choose a base branch
from
+22 −2
Draft

[LoongArch] Initial implementation for enableMemCmpExpansion hook #166526

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
21 changes: 20 additions & 1 deletion llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -111,4 +111,23 @@ bool LoongArchTTIImpl::shouldExpandReduction(const IntrinsicInst *II) const {
}
}

// TODO: Implement more hooks to provide TTI machinery for LoongArch.
LoongArchTTIImpl::TTI::MemCmpExpansionOptions
LoongArchTTIImpl::enableMemCmpExpansion(bool OptSize, bool IsZeroCmp) const {
TTI::MemCmpExpansionOptions Options;

if (!ST->hasUAL())
return Options;

// TODO: Set same as the default value of MaxLoadsPerMemcmp or
// MaxLoadsPerMemcmpOptSize. May need more consideration?
Options.MaxNumLoads = TLI->getMaxExpandSizeMemcmp(OptSize);
Options.NumLoadsPerBlock = Options.MaxNumLoads;
Options.AllowOverlappingLoads = true;

// TODO: Support for vectors.
if (ST->is64Bit())
Options.LoadSizes.push_back(8);
Options.LoadSizes.append({4, 2, 1});

return Options;
}
3 changes: 2 additions & 1 deletion llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,8 @@ class LoongArchTTIImpl : public BasicTTIImplBase<LoongArchTTIImpl> {

bool shouldExpandReduction(const IntrinsicInst *II) const override;

// TODO: Implement more hooks to provide TTI machinery for LoongArch.
TTI::MemCmpExpansionOptions
enableMemCmpExpansion(bool OptSize, bool IsZeroCmp) const override;
};

} // end namespace llvm
Expand Down
Loading