[llvm-bugs] [Bug 36895] New: [X86] Atom scheduler generating incorrect throughputs and latencies

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Mar 25 18:28:28 PDT 2018


            Bug ID: 36895
           Summary: [X86] Atom scheduler generating incorrect throughputs
                    and latencies
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: craig.topper at gmail.com
                CC: llvm-bugs at lists.llvm.org

There's lots of incorrect information

For example, ADDPS should have a latency of 5 and throughput of 1, but the
scheduler test shows llvm reporting latency 5 and throughput 5.

llvm reports latency 125 and throughput 62.5 for sqrtpd, but I think it really
should be a throughput of 124 or 125.

I think there are a lot more issues like this.

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