[LLVMbugs] [Bug 20703] New: [AVX512] add support for ktest

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20703

            Bug ID: 20703
           Summary: [AVX512] add support for ktest
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: matt at pharr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

It would be quite useful to have the ktest instructions available as an
intrinsics.

Alternatively (or in addition?) it would be nice if avx512 codegen matched
patterns along the lines of

%0 = bitcast <16 x i1> %mask to i16
%c = icmp eq i16 %0, 0

And generated a ktest (rather than a kmovw to a scalar register and then a test
instruction as it does now).

Even better, detecting

%mask = and <16 x i1> %mask1, %mask2
%0 = bitcast <16 x i1> %mask to i16
%c = icmp eq i16 %0, 0

And also turning that into a single ktest taking %mask1 and %mask2 would be
great as well.

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