llvm-project/llvm/test/CodeGen/AMDGPU/fix-sgpr-copies.mir

# RUN: llc -march=amdgcn -run-pass=si-fix-sgpr-copies -o - %s | FileCheck --check-prefix=GCN %s

# GCN-LABEL: name: fix-sgpr-copies
# GCN: V_ADD_I32_e32
# GCN: V_ADDC_U32_e32
---
name: fix-sgpr-copies
body:               |
  bb.0:
    %0:vgpr_32 = IMPLICIT_DEF
    %1:sreg_32 = IMPLICIT_DEF
    %2:sreg_32 = IMPLICIT_DEF
    %3:sreg_32 = IMPLICIT_DEF
    %4:vgpr_32 = V_CVT_U32_F32_e64 0, %0:vgpr_32, 0, 0, implicit $exec
    %5:sreg_32 = COPY %4:vgpr_32
    %6:sreg_32 = S_ADD_I32 %2:sreg_32, %5:sreg_32, implicit-def $scc
    %7:sreg_32 = S_ADDC_U32 %3:sreg_32, %1:sreg_32, implicit-def $scc, implicit $scc
...

# Test to ensure i1 phi copies from scalar registers through another phi won't
# be promoted into vector ones.
# GCN-LABEL: name: fix-sgpr-i1-phi-copies
# GCN: .8:
# GCN-NOT: vreg_64 = PHI
---
name: fix-sgpr-i1-phi-copies
tracksRegLiveness: true
body:               |
  bb.9:
    S_BRANCH %bb.0

  bb.4:
    S_CBRANCH_SCC1 %bb.6, implicit undef $scc

  bb.5:
    %3:vreg_1 = IMPLICIT_DEF

  bb.6:
    %4:vreg_1 = PHI %2:sreg_64, %bb.4, %3:vreg_1, %bb.5

  bb.7:
    %5:vreg_1 = PHI %2:sreg_64, %bb.3, %4:vreg_1, %bb.6
    S_BRANCH %bb.8

  bb.0:
    S_CBRANCH_SCC1 %bb.2, implicit undef $scc

  bb.1:
    %0:sreg_64 = S_MOV_B64 0
    S_BRANCH %bb.3

  bb.2:
    %1:sreg_64 = S_MOV_B64 -1
    S_BRANCH %bb.3

  bb.3:
    %2:sreg_64 = PHI %0:sreg_64, %bb.1, %1:sreg_64, %bb.2
    S_CBRANCH_SCC1 %bb.7, implicit undef $scc
    S_BRANCH %bb.4

  bb.8:
...

# Avoid infinite loop in SIInstrInfo::legalizeGenericOperand when checking for ImpDef.
# GCN-LABEL: name: legalize-operand-search-each-def-once
# GCN-NOT: sreg_64 PHI
---
name: legalize-operand-search-each-def-once
tracksRegLiveness: true
body:               |
  bb.0:
    successors: %bb.1, %bb.2
    liveins: $sgpr0_sgpr1

    %0:sgpr_64 = COPY $sgpr0_sgpr1
    S_CBRANCH_VCCZ %bb.2, implicit undef $vcc
    S_BRANCH %bb.1

  bb.1:
    %1:vreg_64 = IMPLICIT_DEF
    S_BRANCH %bb.2

  bb.2:
    %2:sgpr_64 = PHI %0, %bb.0, %1, %bb.1
    $sgpr0_sgpr1 = COPY %0
...

# A REG_SEQUENCE that uses registers defined by both a PHI and a COPY could
# result in an endless search.
# GCN-LABEL: name: process-phi-search-each-use-once
# GCN-NOT: sreg_32 PHI
---
name: process-phi-search-each-use-once
tracksRegLiveness: true
body:               |
  bb.0:
    successors: %bb.1, %bb.2
    liveins: $vgpr3

    %0:vgpr_32 = COPY $vgpr3
    S_CBRANCH_VCCZ %bb.2, implicit undef $vcc
    S_BRANCH %bb.1

  bb.1:
    %1:sgpr_32 = IMPLICIT_DEF
    S_BRANCH %bb.2

  bb.2:
    %2:sgpr_32 = PHI %0, %bb.0, %1, %bb.1
    %3:vreg_64 = REG_SEQUENCE %2, %subreg.sub0, %0, %subreg.sub1
    $vgpr3 = COPY %3.sub0
...