| Mikael Holmen | 6c062b7 | 2018-03-28 06:01:30 +0000 | [diff] [blame^] | 1 | # RUN: llc -march=mips64 -o - %s -run-pass=simple-register-coalescing | FileCheck %s |
| 2 | |
| 3 | --- |
| 4 | name: f |
| 5 | tracksRegLiveness: true |
| 6 | body: | |
| 7 | bb.0: |
| 8 | successors: %bb.1 |
| 9 | |
| 10 | %21:gpr32 = ADDiu $zero, 0 |
| 11 | %22:gpr32 = COPY %21 |
| 12 | %22:gpr32 = ADDiu %22, 1 |
| 13 | J %bb.1, implicit-def dead $at |
| 14 | |
| 15 | bb.1: |
| 16 | successors: %bb.2 |
| 17 | |
| 18 | BEQ %22, $zero, %bb.2, implicit-def $at |
| 19 | |
| 20 | bb.2: |
| 21 | successors: %bb.2, %bb.3 |
| 22 | |
| 23 | %22:gpr32 = COPY %21 |
| 24 | %21:gpr32 = COPY %22 |
| 25 | BEQ undef %0:gpr32, $zero, %bb.2, implicit-def $at |
| 26 | |
| 27 | bb.3: |
| 28 | |
| 29 | ... |
| 30 | |
| 31 | # We should not hoist the |
| 32 | # |
| 33 | # %22:gpr32 = COPY %21 |
| 34 | # |
| 35 | # into bb.1 since %22 is used in the BEQ. |
| 36 | |
| 37 | # CHECK-LABEL: bb.1: |
| 38 | # CHECK-NOT: COPY |
| 39 | # CHECK: BEQ |
| 40 | |
| 41 | # CHECK-LABEL: bb.2: |