[llvm-bugs] [Bug 32801] New: Add scheduler classes for integer/float horizontal operations

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Apr 26 06:39:17 PDT 2017


            Bug ID: 32801
           Summary: Add scheduler classes for integer/float horizontal
           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,
                    llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com
            Blocks: 26859, 32325

The integer/float horizontal operations (PHADD, PHSUBD, HADDPS etc.) often have
very different latency/throughput characteristics to basic 'in-element'
arithmetic instructions.

They need separating from the existing classes and grouped into their own
integer/float classes to allow better scheduling (Bug #32325) and MC
optimization (Bug #26859).

Referenced Bugs:

[Bug 26859] [x86, SSE] only use phaddw / phaddd when optimizing for minsize?
[Bug 32325] [META][X86] Improve implementation and use of X86 scheduler models
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