llvm/test/CodeGen/Hexagon/swp-carried-dep3.mir

# RUN: llc -mtriple=hexagon -run-pass pipeliner -debug-only=pipeliner %s -o /dev/null 2>&1 -pipeliner-experimental-cg=true | FileCheck %s
# REQUIRES: asserts

# Test that the loop carried dependence check correctly identifies a recurrence
# when load and store use distinct increment for their pointer. To test this,
# we check that we don't have the Rec NodeSet containing SU(5) and SU(7) which
# requires to use a single CHECK-NOT to match such a Rec NodeSet. Fortunately
# the atom '.' does not match a newline but anything else on a line.

# CHECK: Overlap check:
# CHECK-NEXT:   BaseMI:   %13:intregs = S2_storerh_pi %12:intregs(tied-def 0), 2, %20:intregs :: (store (s16))
# CHECK-NEXT:     Base + 0 + I * 2, Len: 2
# CHECK-NEXT:   OtherMI:   %19:intregs, %15:intregs = L2_loadrh_pi %14:intregs(tied-def 1), 2 :: (load (s16))
# CHECK-NEXT:     Base + 0 + I * 2, Len: 2
# CHECK-NEXT:   Result: No overlap

# CHECK-NOT: Rec NodeSet{{.+[[:space:]]}} SU(5){{.+[[:space:]]}} SU(7)

...
---
name:            test
tracksRegLiveness: true

body:             |
  bb.0:
    successors: %bb.3, %bb.1
    liveins: $r0, $r1, $r2

    %14:intregs = COPY $r2
    %13:intregs = COPY $r1
    %12:intregs = COPY $r0
    %16:predregs = C2_cmpeqi %14, 2
    %15:intregs = A2_tfrsi 0
    J2_jumpt killed %16, %bb.3, implicit-def dead $pc
    J2_jump %bb.1, implicit-def dead $pc

  bb.1:
    successors: %bb.2

    %0:intregs = A2_addi %14, -2
    %1:intregs = A2_addi %12, 10
    %2:intregs = A2_addi %13, 4
    %17:intregs = A2_tfrsi 0
    %23:intregs = COPY %0
    J2_loop0r %bb.2, %23, implicit-def $lc0, implicit-def $sa0, implicit-def $usr

  bb.2 (machine-block-address-taken):
    successors: %bb.3, %bb.2

    %3:intregs = PHI %2, %bb.1, %10, %bb.2
    %4:intregs = PHI %1, %bb.1, %9, %bb.2
    %21:intregs = PHI %1, %bb.1, %22, %bb.2
    %6:intregs = PHI %17, %bb.1, %7, %bb.2
    %18:intregs, %10:intregs = L2_loadrh_pi %3, 2 :: (load (s16))
    %19:intregs, %22:intregs = L2_loadrh_pi %21, 2 :: (load (s16))
    %20:intregs = A2_addi %18, 10
    %9:intregs = S2_storerh_pi %4, 2, killed %20 :: (store (s16))
    %7:intregs = M2_acci %19, %6, %18
    ENDLOOP0 %bb.2, implicit-def $pc, implicit-def $lc0, implicit $sa0, implicit $lc0
    J2_jump %bb.3, implicit-def dead $pc

  bb.3:
    %11:intregs = PHI %15, %bb.0, %7, %bb.2
    $r0 = COPY %11
    PS_jmpret $r31, implicit-def dead $pc, implicit $r0

...