llvm/test/CodeGen/Thumb2/phi_prevent_copy.mir

# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -mtriple=thumbv8.1m.main-none-eabi -mattr=+mve -simplify-mir -run-pass=phi-node-elimination %s -o - | FileCheck %s
--- |
  ; ModuleID = '<stdin>'
  target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
  target triple = "arm-arm-none-eabi"

  ; Function Attrs: nofree norecurse nounwind
  define void @test(i8* noalias nocapture %X, i8* noalias nocapture readonly %Y, i32 %n) {
  entry:
    %cmp6 = icmp sgt i32 %n, 0
    br i1 %cmp6, label %for.body.preheader, label %for.cond.cleanup

  for.body.preheader:                               ; preds = %entry
    call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 4 %X, i8* align 4 %Y, i32 %n, i1 false)
    br label %for.cond.cleanup

  for.cond.cleanup:                                 ; preds = %for.body.preheader, %entry
    ret void
  }

  ; Function Attrs: argmemonly nofree nosync nounwind willreturn
  declare void @llvm.memcpy.p0i8.p0i8.i32(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i32, i1 immarg)

...
---
name:            test
tracksRegLiveness: true
body:             |
  ; CHECK-LABEL: name: test
  ; CHECK: bb.0.entry:
  ; CHECK:   successors: %bb.1(0x50000000), %bb.3(0x30000000)
  ; CHECK:   liveins: $r0, $r1, $r2
  ; CHECK:   [[COPY:%[0-9]+]]:rgpr = COPY killed $r2
  ; CHECK:   [[COPY1:%[0-9]+]]:rgpr = COPY killed $r1
  ; CHECK:   [[COPY2:%[0-9]+]]:rgpr = COPY killed $r0
  ; CHECK:   t2CMPri [[COPY]], 1, 14 /* CC::al */, $noreg, implicit-def $cpsr
  ; CHECK:   t2Bcc %bb.3, 11 /* CC::lt */, killed $cpsr
  ; CHECK:   t2B %bb.1, 14 /* CC::al */, $noreg
  ; CHECK: bb.1.for.body.preheader:
  ; CHECK:   [[t2ADDri:%[0-9]+]]:rgpr = t2ADDri [[COPY]], 15, 14 /* CC::al */, $noreg, $noreg
  ; CHECK:   [[t2BICri:%[0-9]+]]:rgpr = t2BICri killed [[t2ADDri]], 16, 14 /* CC::al */, $noreg, $noreg
  ; CHECK:   [[t2LSRri:%[0-9]+]]:gprlr = t2LSRri killed [[t2BICri]], 4, 14 /* CC::al */, $noreg, $noreg
  ; CHECK:   [[COPY3:%[0-9]+]]:rgpr = COPY [[COPY1]]
  ; CHECK:   [[COPY4:%[0-9]+]]:rgpr = COPY [[COPY2]]
  ; CHECK:   [[COPY5:%[0-9]+]]:rgpr = COPY [[COPY]]
  ; CHECK:   [[t2WhileLoopStartLR:%[0-9]+]]:gprlr = t2WhileLoopStartLR killed [[t2LSRri]], %bb.3, implicit-def dead $cpsr
  ; CHECK: bb.2:
  ; CHECK:   [[COPY6:%[0-9]+]]:rgpr = COPY [[COPY5]]
  ; CHECK:   [[COPY7:%[0-9]+]]:gprlr = COPY [[t2WhileLoopStartLR]]
  ; CHECK:   [[COPY8:%[0-9]+]]:rgpr = COPY [[COPY4]]
  ; CHECK:   [[COPY9:%[0-9]+]]:rgpr = COPY [[COPY3]]
  ; CHECK:   [[MVE_VCTP8_:%[0-9]+]]:vccr = MVE_VCTP8 [[COPY6]], 0, $noreg, $noreg
  ; CHECK:   [[t2SUBri:%[0-9]+]]:rgpr = t2SUBri killed [[COPY6]], 16, 14 /* CC::al */, $noreg, $noreg
  ; CHECK:   [[MVE_VLDRBU8_post:%[0-9]+]]:rgpr, [[MVE_VLDRBU8_post1:%[0-9]+]]:mqpr = MVE_VLDRBU8_post killed [[COPY9]], 16, 1, [[MVE_VCTP8_]], $noreg
  ; CHECK:   [[MVE_VSTRBU8_post:%[0-9]+]]:rgpr = MVE_VSTRBU8_post killed [[MVE_VLDRBU8_post1]], killed [[COPY8]], 16, 1, killed [[MVE_VCTP8_]], $noreg
  ; CHECK:   [[COPY10:%[0-9]+]]:rgpr = COPY [[MVE_VLDRBU8_post]]
  ; CHECK:   [[COPY10:%[0-9]+]]:rgpr = COPY [[MVE_VSTRBU8_post]]
  ; CHECK:   [[COPY10:%[0-9]+]]:rgpr = COPY [[t2SUBri]]
  ; CHECK:   [[t2LoopEndDec:%[0-9]+]]:gprlr = t2LoopEndDec killed [[COPY7]], %bb.2, implicit-def dead $cpsr
  ; CHECK:   t2B %bb.3, 14 /* CC::al */, $noreg
  ; CHECK: bb.3.for.cond.cleanup:
  ; CHECK:   tBX_RET 14 /* CC::al */, $noreg
  bb.0.entry:
    successors: %bb.1(0x50000000), %bb.3(0x30000000)
    liveins: $r0, $r1, $r2

    %2:rgpr = COPY killed $r2
    %1:rgpr = COPY killed $r1
    %0:rgpr = COPY killed $r0
    t2CMPri %2, 1, 14 /* CC::al */, $noreg, implicit-def $cpsr
    t2Bcc %bb.3, 11 /* CC::lt */, killed $cpsr
    t2B %bb.1, 14 /* CC::al */, $noreg

  bb.1.for.body.preheader:
    successors: %bb.3(0x40000000), %bb.2(0x40000000)

    %3:rgpr = t2ADDri %2, 15, 14 /* CC::al */, $noreg, $noreg
    %4:rgpr = t2BICri killed %3, 16, 14 /* CC::al */, $noreg, $noreg
    %5:gprlr = t2LSRri killed %4, 4, 14 /* CC::al */, $noreg, $noreg
    %6:gprlr = t2WhileLoopStartLR killed %5, %bb.3, implicit-def dead $cpsr

  bb.2:
    successors: %bb.2(0x40000000), %bb.3(0x40000000)

    %7:rgpr = PHI %1, %bb.1, %8, %bb.2
    %9:rgpr = PHI %0, %bb.1, %10, %bb.2
    %11:gprlr = PHI %6, %bb.1, %12, %bb.2
    %13:rgpr = PHI %2, %bb.1, %14, %bb.2
    %15:vccr = MVE_VCTP8 %13, 0, $noreg, $noreg
    %14:rgpr = t2SUBri killed %13, 16, 14 /* CC::al */, $noreg, $noreg
    %8:rgpr, %16:mqpr = MVE_VLDRBU8_post killed %7, 16, 1, %15, $noreg
    %10:rgpr = MVE_VSTRBU8_post killed %16, killed %9, 16, 1, killed %15, $noreg
    %12:gprlr = t2LoopEndDec killed %11, %bb.2, implicit-def dead $cpsr
    t2B %bb.3, 14 /* CC::al */, $noreg

  bb.3.for.cond.cleanup:
    tBX_RET 14 /* CC::al */, $noreg

...