[llvm-bugs] [Bug 32216] New: [X86] Better testing of schedule model instruction latencies/throughputs

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Mar 10 06:02:30 PST 2017


            Bug ID: 32216
           Summary: [X86] Better testing of schedule model instruction
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: andrew.v.tischenko at gmail.com, craig.topper at gmail.com,
                    davide at freebsd.org, filcab at gmail.com,
                    llvm-bugs at lists.llvm.org, simon.f.whittaker at gmail.com,
                    spatel+llvm at rotateright.com

We don't currently do a very good job of testing the various costs of
instructions based on the specific schedule model used (generic, atom,
sandybridge, haswell, silvermont, jaguar).

To help improve this it would be useful to have an option to to output assembly
comments that indicate latency/throughput etc. of each instruction. We should
then create a set of test files that cover a decent range of instructions.

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