| # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py |
| # RUN: llc -march=amdgcn -run-pass peephole-opt -verify-machineinstrs -o - %s | FileCheck -check-prefix=GCN %s |
| |
| # Check that when we jump through several subregisters in sequence of |
| # reg_sequence we can still find a plain src for a copy. |
| # In this specific test, we want %4 to read directly from %1 and |
| # %5 from %0. These values come from the respective chains: |
| # %4 -> %3.sub0 -> %2.sub1 -> %1 |
| # %5 -> %3.sub1 -> %2.sub0 -> %0 |
| # |
| # We used to not simplify this because we were bailing when two |
| # subreg indices were in the same chain (%3.subX and %2.subY) |
| --- |
| name: reg_sequence_removal |
| body: | |
| bb.0: |
| liveins: $vgpr0, $vgpr1 |
| |
| ; GCN-LABEL: name: reg_sequence_removal |
| ; GCN: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0 |
| ; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr1 |
| ; GCN: [[REG_SEQUENCE:%[0-9]+]]:vreg_64 = REG_SEQUENCE [[COPY]], %subreg.sub0, [[COPY1]], %subreg.sub1 |
| ; GCN: [[REG_SEQUENCE1:%[0-9]+]]:vreg_64 = REG_SEQUENCE [[REG_SEQUENCE]].sub1, %subreg.sub0, [[REG_SEQUENCE]].sub0, %subreg.sub1 |
| ; GCN: [[COPY2:%[0-9]+]]:vgpr_32 = COPY [[COPY1]] |
| ; GCN: [[COPY3:%[0-9]+]]:vgpr_32 = COPY [[COPY]] |
| ; GCN: KILL [[COPY3]], implicit [[COPY2]] |
| %0:vgpr_32 = COPY $vgpr0 |
| %1:vgpr_32 = COPY $vgpr1 |
| %2:vreg_64 = REG_SEQUENCE %0, %subreg.sub0, %1, %subreg.sub1 |
| %3:vreg_64 = REG_SEQUENCE %2.sub1, %subreg.sub0, %2.sub0, %subreg.sub1 |
| %4:vgpr_32 = COPY %3.sub0 |
| %5:vgpr_32 = COPY %3.sub1 |
| KILL implicit %4, %5 |
| ... |