[LLVMbugs] [Bug 23979] New: Cannot copy AL to XMMO

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23979

            Bug ID: 23979
           Summary: Cannot copy AL to XMMO
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: chfast at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

llc with FastISel (-O0) fails to compile the IR for X86 target. Assert fails
with comment: "Cannot copy AL to XMM0. Cannot emit physreg copy instruction."

Test code:

target triple = "x86_64-unknown-linux-gnu"

define <8 x i1> @test() {
  %C = icmp ult <8 x i16> zeroinitializer, zeroinitializer
  br label %B

B:
  %I = insertelement <8 x i1> %C, i1 undef, i32 0
  ret <8 x i1> %I
}

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