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Tracking Issue for clflushopt_target_feature #157096
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C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.
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C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFCT-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.needs-triageThis issue may need triage. Remove it if it has been sufficiently triaged.This issue may need triage. Remove it if it has been sufficiently triaged.
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This is a tracking issue for the
clflushoptx86 target feature, used to gate the_mm_clflushoptintrinsic (#![feature(clflushopt_target_feature)]).Requested in rust-lang/stdarch#1456.
CLFLUSHOPTis a standalone x86 CPUID feature (Intel Skylake+ / AMD Excavator+, ~2015) for weakly-ordered cache-line flushing. Today stdarch exposes only the SSE2_mm_clflush; there is no way to emitclflushoptfrom an intrinsic.Steps
clflushopttarget feature to the compiler (this issue)._mm_clflushoptintrinsic in stdarch (see rust-lang/stdarch#1456).