[llvm-bugs] [Bug 30258] New: [SLP][AArch64] Implement cost model for intrinsics.

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https://llvm.org/bugs/show_bug.cgi?id=30258

            Bug ID: 30258
           Summary: [SLP][AArch64] Implement cost model for intrinsics.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: mcrosier at codeaurora.org
                CC: bmakam at codeaurora.org, llvm-bugs at lists.llvm.org
    Classification: Unclassified

In r270537, Simon added the framework for an intrinsic cost model in the X86
backend.  We should consider doing the same for AArch64 as this may expose
opportunities in the SLP vectorizer.

Currently, X86 supports bitreverse, bswap, ctlz, ctpop, and cttz.  I want to
say AArch64 has support for most of these in vector form.  However, I don't
know how well the AArch64 backend handles the lowering of these intrinsics.

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