[llvm-bugs] [Bug 28770] New: Cannot select: v4f64 = X86ISD::SUBV_BROADCAST

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=28770

            Bug ID: 28770
           Summary: Cannot select: v4f64 = X86ISD::SUBV_BROADCAST
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: igor at azulsystems.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 16837
  --> https://llvm.org/bugs/attachment.cgi?id=16837&action=edit
Test case

LLVM fails with:

$ llc test.ll

LLVM ERROR: Cannot select: 0x7fe4c4082730: v4f64 = X86ISD::SUBV_BROADCAST
0x7fe4c4082500
  0x7fe4c4082500: v2f64,ch = load<LD16[%tmp142(addrspace=1)]> 0x7fe4c3c0cfd0,
0x7fe4c4082340, undef:i64
    0x7fe4c4082340: i64 = add 0x7fe4c4081e70, Constant:i64<8>
      0x7fe4c4081e70: i64,ch = CopyFromReg 0x7fe4c3c0cfd0, Register:i64 %vreg0
        0x7fe4c4081e00: i64 = Register %vreg0
      0x7fe4c4081fc0: i64 = Constant<8>
    0x7fe4c40821f0: i64 = undef
In function: test

Reverting this change: https://reviews.llvm.org/D22460 allows test to pass.

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