Some perf-analyzis-driven improvements. #1849
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nicolasnoble
commented
Jan 20, 2025
nicolasnoble
commented
- Added a safety variant for hot path operations in the bump allocator and the ordering table.
- Unrolled the insert operation for the ordering table.
- Added a safety variant for hot path operations in the bump allocator and the ordering table. - Unrolled the insert operation for the ordering table.
WalkthroughThe changes introduce a new Changes
Sequence DiagramsequenceDiagram
participant User
participant BumpAllocator
participant OrderingTable
User->>BumpAllocator: Allocate Memory
alt Safety Enabled
BumpAllocator-->>User: Check Memory Availability
else Safety Disabled
BumpAllocator-->>User: Allocate Without Checks
end
User->>OrderingTable: Insert Fragment
alt Safety Enabled
OrderingTable-->>User: Clamp Z-Value
else Safety Disabled
OrderingTable-->>User: Insert Without Clamping
end
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Actionable comments posted: 1
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📒 Files selected for processing (4)
src/mips/psyqo/bump-allocator.hh(3 hunks)src/mips/psyqo/ordering-table.hh(3 hunks)src/mips/psyqo/shared.hh(1 hunks)src/mips/psyqo/src/ordering-table.cpp(0 hunks)
💤 Files with no reviewable changes (1)
- src/mips/psyqo/src/ordering-table.cpp
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🔇 Additional comments (8)
src/mips/psyqo/bump-allocator.hh (4)
35-35: Including 'psyqo/shared.hh' is appropriateThe inclusion of
"psyqo/shared.hh"ensures that theSafeenum is available for use in this file.
55-55: Introduction of 'safety' template parameter enhances flexibilityAdding the
safetytemplate parameter allows for conditional safety checks inBumpAllocator, enabling performance optimizations when safety checks are not required.
61-63: Conditional safety checks are correctly implementedUtilizing
if constexprwith thesafetytemplate parameter effectively enables compile-time optimization, allowing the assertion to be included or omitted based on the safety setting.
78-80: Ensure responsible usage when safety checks are disabledWhen
safetyis set toSafe::No, the assertion for memory availability is omitted. Ensure that all calls toallocatehandle memory availability appropriately to prevent buffer overflows or memory corruption.Consider documenting the requirement for the caller to guarantee sufficient memory when safety checks are disabled.
src/mips/psyqo/shared.hh (1)
34-34: Definition of 'Safe' enum class is appropriateThe
Safeenum class provides a clear and type-safe mechanism to control safety checks throughout the codebase.src/mips/psyqo/ordering-table.hh (3)
29-29: Including necessary headers for 'Safe' enum and 'eastl::clamp'Including
<EASTL/algorithm.h>and"psyqo/shared.hh"provides access toeastl::clampand theSafeenum, which are required for the safety enhancements.Also applies to: 33-33
58-58: Addition of 'safety' template parameter aligns with allocatorIntroducing the
safetyparameter toOrderingTablemirrors the change inBumpAllocator, offering consistent control over safety checks.
92-93:⚠️ Potential issuePointer truncation may cause issues on 64-bit architectures
The expression
reinterpret_cast<uint32_t>(head) & 0xffffffcasts a pointer to a 32-bit integer and masks it to 24 bits. On 64-bit systems, this can result in pointer truncation and incorrect behavior.Consider using
uintptr_tfor pointer-to-integer conversions to ensure compatibility across 32-bit and 64-bit architectures. Modify the code as follows:- table[z] = reinterpret_cast<uint32_t>(head) & 0xffffff; + table[z] = reinterpret_cast<uintptr_t>(head) & 0xffffff;Ensure that the masking to 24 bits is appropriate and does not lead to loss of significant address information on 64-bit systems.
Likely invalid or redundant comment.
