Port #39096 - Implementation of CSE for large constants on ARM64 #39883
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* Change the type of csdHashKey to size_t * Update gtCostSz and gtCostEx for constant nodes * Implementation of code size optimization, CSE of constant values for ARM64 Implementation of code size optimization, CSE of constant values for ARM64 We will share a single CSE for constants that differ only in their low 12 bits on ARM64 Number of shared constant low bits set in target.h CSE_CONST_SHARED_LOW_BITS we use 12 bits on Arm platforms and 16 bits on XArch platforms Disable the CSE of the REG_R2R_INDIRECT_PARAM on Arm32 as it hits Assertion failed 'candidates != candidateBit' in lsra.cpp Line: 3723 Config variable: COMPlus_JitConstCSE // Default 0: enable the CSE of Constants, including nearby offsets. (only for ARM64) // If 1, disable all the CSE of Constants // If 2, enable the CSE of Constants but don't combine with nearby offsets. (only for ARM64) // If 3, enable the CSE of Constants including nearby offsets. (all platforms) // If 4, enable the CSE of Constants but don't combine with nearby offsets. (all platforms) // * Added additional Priority 0 test coverage for Floating Point optimizations * Fix for COMPLUS_JitConstCSE=4 * Renamed config variable from COMPlus_JitDisableConstCSE to COMPlus_JitConstCSE * Updated with Codereview feedback, removed sort from Const CSE phase * Fix for assertionProp issue in the refTypesdynamic test
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I believe that the test failure is due to: #39473 runtime (Build Browser wasm Release AllSubsets_Mono) Failing after 74m — Build Browser wasm Release AllSubsets_Mono failed This is what I found in the console log for the test leg: |
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@jeffschwMSFT PTAL |
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BruceForstall
approved these changes
Jul 24, 2020
sandreenko
approved these changes
Jul 24, 2020
ghost
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Implementation of code size optimization, CSE of large constant for ARM64
We will share a single CSE for constants that differ only in their low 12 bits on ARM64
Config variable: COMPlus_JitConstCSE
// Default 0: enable the CSE of Constants, including nearby offsets. (only for ARM64)
// If 1, disable all the CSE of Constants
// If 2, enable the CSE of Constants but don't combine with nearby offsets. (only for ARM64)
// If 3, enable the CSE of Constants including nearby offsets. (all platforms)
// If 4, enable the CSE of Constants but don't combine with nearby offsets. (all platforms)
//