llvm-project/llvm/test/CodeGen/AMDGPU/fold-imm-copy.mir

# RUN: llc -march=amdgcn -run-pass si-fold-operands -verify-machineinstrs %s -o - | FileCheck -check-prefix=GCN %s

# GCN-LABEL:       name: fold-imm-copy
# GCN:             [[SREG:%[0-9+]]]:sreg_32_xm0 = S_MOV_B32 65535
# GCN:             V_AND_B32_e32 [[SREG]]

---
name: fold-imm-copy
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $vgpr0, $sgpr0_sgpr1
    %0:vgpr_32 = COPY $vgpr0
    %1:sgpr_64 = COPY $sgpr0_sgpr1
    %2:sgpr_128 = S_LOAD_DWORDX4_IMM %1, 9, 0, 0
    %3:sreg_32_xm0 = S_MOV_B32 2
    %4:vgpr_32 = V_LSHLREV_B32_e64 killed %3, %0, implicit $exec
    %5:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
    %6:vreg_64 = REG_SEQUENCE killed %4, %subreg.sub0, killed %5, %subreg.sub1
    %7:vgpr_32 = BUFFER_LOAD_DWORD_ADDR64 %6, %2, 0, 4, 0, 0, 0, 0, 0, implicit $exec
    %8:sreg_32_xm0 = S_MOV_B32 65535
    %9:vgpr_32 = COPY %8
    %10:vgpr_32 = V_AND_B32_e32 %7, %9, implicit $exec
...

---
# GCN-LABEL:       name: no_extra_fold_on_same_opnd
# The first XOR needs commuting to fold that immediate operand.
# GCN:             V_XOR_B32_e32 {{.*}} 0, %1
# GCN:             V_XOR_B32_e32 %2, %4.sub0
name: no_extra_fold_on_same_opnd
tracksRegLiveness: true
body:             |
  bb.0:
    %0:vgpr_32  = IMPLICIT_DEF
    %1:vgpr_32  = IMPLICIT_DEF
    %2:vgpr_32  = IMPLICIT_DEF
    %3:vgpr_32  = V_MOV_B32_e32 0, implicit $exec
    %4:vreg_64  = REG_SEQUENCE killed %0, %subreg.sub0, killed %3, %subreg.sub1
    %5:vgpr_32  = V_XOR_B32_e32 %1, %4.sub1, implicit $exec
    %6:vgpr_32  = V_XOR_B32_e32 %2, %4.sub0, implicit $exec
...