third_party/llvm-7.0/llvm/test/CodeGen/Hexagon/livephysregs-lane-masks.mir

# RUN: llc -march=hexagon -run-pass if-converter -verify-machineinstrs -o - %s | FileCheck %s

# CHECK-LABEL: name: foo
# CHECK: $p0 = C2_cmpeqi $r16, 0
# Make sure there is no implicit use of r1.
# CHECK: $r1 = L2_ploadruhf_io $p0, $r29, 6

--- |
  define void @foo() {
    ret void
  }
...


---
name: foo
tracksRegLiveness: true

body: |
  bb.0:
    liveins: $r16
    successors: %bb.1, %bb.2
        $p0 = C2_cmpeqi $r16, 0
        J2_jumpt $p0, %bb.2, implicit-def $pc

  bb.1:
    ; The lane mask $d0:0002 is equivalent to $r0. LivePhysRegs would ignore
    ; it and treat it as the whole $d0, which is a pair $r1, $r0. The extra
    ; $r1 would cause an (undefined) implicit use to be added during
    ; if-conversion.
    liveins: $d0:0x00000002, $d15:0x00000001, $r16
    successors: %bb.2
        $r1 = L2_loadruh_io $r29, 6
        S2_storeri_io killed $r16, 0, $r1

  bb.2:
    liveins: $r0
        $d8 = L2_loadrd_io $r29, 8
        $d15 = L4_return $r29, implicit-def $r29, implicit-def $pc, implicit $r30, implicit $framekey