https://bugs.llvm.org/show_bug.cgi?id=35948
Bug ID: 35948
Summary: Why FeatureSlowPMULLD is not set for Haswell+?
Product: libraries
Version: 6.0
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: nekotek...@gmail.com
CC: llvm-bugs@lists.llvm.org
Hello, it seems that LLVM sets this flag for Silvermont processors, but not
others. On Haswell or Skylake processors (for example), PMULLD has latency 10,
when other vector multiplication instructions have latency 5.
https://bugs.llvm.org/show_bug.cgi?id=28128 seems related.
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