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Ah, it seems that there is the (unreviewed) similar patch in LLVM (https://reviews.llvm.org/D110069) |
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This improves load performance but does not seem to improve RMW and store performance (on AWS Graviton2). https://cirrus-ci.com/task/5305441004552192 |
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bors r+ |
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70: aarch64: Use CASP instead of LDXP/STXP for store/RMW if available r=taiki-e a=taiki-e Follow-up #20 In #20, we postponed this (#20 (comment)), but LLVM 16+ adopted this (llvm/llvm-project@10d34f5), so we'll follow LLVM's behavior. Co-authored-by: Taiki Endo <te316e89@gmail.com>
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70: aarch64: Use CASP instead of LDXP/STXP for store/RMW if available r=taiki-e a=taiki-e Follow-up #20 In #20, we postponed this (#20 (comment)), but LLVM 16+ adopted this (llvm/llvm-project@10d34f5), so we'll follow LLVM's behavior. Co-authored-by: Taiki Endo <te316e89@gmail.com>
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70: aarch64: Use CASP instead of LDXP/STXP for store/RMW if available r=taiki-e a=taiki-e Follow-up #20 In #20, we postponed this (#20 (comment)), but LLVM 16+ adopted this (llvm/llvm-project@10d34f5), so we'll follow LLVM's behavior. Co-authored-by: Taiki Endo <te316e89@gmail.com>
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See llvm/llvm-project#55199 for the motivation.
In CAS we have already done this; in RMW and store we still use LDXP/STXP even if LSE is available because the performance benefits do not seem clear yet.