[LLVMbugs] [Bug 23941] New: AVX512: unable to select vcvtps2ph/ph2ps from fpext/fptrunc

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23941

            Bug ID: 23941
           Summary: AVX512: unable to select vcvtps2ph/ph2ps from
                    fpext/fptrunc
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: ahmed.bougacha at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

This fails to select the native instructions with +avx512f,-f16c:

define float @test_extend32(half* %addr) {
  %val16 = load half, half* %addr
  %val32 = fpext half %val16 to float
  ret float %val32
}


When users specify -mavx512f without any CPU (so without specifying F16C), this
means we'll get the libcalls instead of the cvt instructions, because of the
hasF16C() checks guarding legality.

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