[llvm-bugs] [Bug 36256] New: [X86] Couple lit tests generate KMOVQ instructions on KNL which doesn't support KMOVQ

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Feb 6 14:53:30 PST 2018


https://bugs.llvm.org/show_bug.cgi?id=36256

            Bug ID: 36256
           Summary: [X86] Couple lit tests generate KMOVQ instructions on
                    KNL which doesn't support KMOVQ
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            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

While investing PR36254, I discovered that this two tests try to preserve
k-registers with a spill size of 64 bits which trigger us to use kmovq. But KNL
doesn't support KMOVQ/KMOVD and should use a spill size of 16 bits.

    LLVM :: CodeGen/X86/avx512-intel-ocl.ll
    LLVM :: CodeGen/X86/x86-interrupt_cc.ll

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