1 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
2 # RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -verify-machineinstrs -verify-coalescing -run-pass=register-coalescer -o - %s | FileCheck %s
4 # The copy from %0 to %1 introduces liveness for %3.sub2. After
5 # coalescing, the use of %1.sub2 needs to be marked undef. The
6 # subregless copy previously did not consider the existing subregister
10 name: undef_subreg_use_after_full_copy_coalesce_0
11 tracksRegLiveness: true
14 ; CHECK-LABEL: name: undef_subreg_use_after_full_copy_coalesce_0
15 ; CHECK: undef [[V_MOV_B32_e32_:%[0-9]+]].sub0:vreg_96 = V_MOV_B32_e32 0, implicit $exec
16 ; CHECK-NEXT: dead [[V_MOV_B32_e32_:%[0-9]+]].sub1:vreg_96 = V_MOV_B32_e32 0, implicit $exec
17 ; CHECK-NEXT: S_ENDPGM 0, implicit undef [[V_MOV_B32_e32_]].sub2
18 undef %0.sub0:vreg_96 = V_MOV_B32_e32 0, implicit $exec
19 %0.sub1:vreg_96 = V_MOV_B32_e32 0, implicit $exec
20 %1:vreg_96 = COPY killed %0
21 S_ENDPGM 0, implicit %1.sub2
25 # Same, except coalesced copy has a subregister index that needs to be
26 # composed with the use index.
28 name: undef_subreg_use_after_full_copy_coalesce_composed
29 tracksRegLiveness: true
32 ; CHECK-LABEL: name: undef_subreg_use_after_full_copy_coalesce_composed
33 ; CHECK: undef [[V_MOV_B32_e32_:%[0-9]+]].sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
34 ; CHECK-NEXT: dead [[V_MOV_B32_e32_:%[0-9]+]].sub1:vreg_128 = V_MOV_B32_e32 0, implicit $exec
35 ; CHECK-NEXT: [[DEF:%[0-9]+]]:vreg_64 = IMPLICIT_DEF
36 ; CHECK-NEXT: S_ENDPGM 0, implicit [[DEF]].sub1
37 undef %0.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
38 %0.sub1:vreg_128 = V_MOV_B32_e32 0, implicit $exec
39 %1:vreg_128 = COPY killed %0
40 %2:vreg_64 = COPY killed %1.sub2_sub3
41 S_ENDPGM 0, implicit %2.sub1
45 # FIXME: Initial computed range is wrong for %0.sub2_sub3 and fails
48 # name: undef_subreg_use_after_full_copy_coalesce_composed2
49 # tracksRegLiveness: true
52 # undef %0.sub0:vreg_128 = V_MOV_B32_e32 0, implicit $exec
53 # %0.sub1:vreg_128 = V_MOV_B32_e32 0, implicit $exec
54 # %1:vreg_128 = COPY killed %0.sub2_sub3
55 # S_ENDPGM 0, implicit %1.sub1
60 name: undef_subreg_use_after_full_copy_coalesce_1
61 tracksRegLiveness: true
64 liveins: $vgpr0, $vgpr1, $vgpr2
66 ; CHECK-LABEL: name: undef_subreg_use_after_full_copy_coalesce_1
67 ; CHECK: liveins: $vgpr0, $vgpr1, $vgpr2
69 ; CHECK-NEXT: undef [[COPY:%[0-9]+]].sub0:vreg_96 = COPY $vgpr0
70 ; CHECK-NEXT: [[COPY:%[0-9]+]].sub1:vreg_96 = COPY $vgpr1
71 ; CHECK-NEXT: S_NOP 0, implicit undef [[COPY]].sub2
72 ; CHECK-NEXT: S_NOP 0, implicit [[COPY]].sub1
73 ; CHECK-NEXT: S_ENDPGM 0
74 %0:vgpr_32 = COPY killed $vgpr0
75 %1:vgpr_32 = COPY killed $vgpr1
76 undef %2.sub0:vreg_96 = COPY killed %0
77 %2.sub1:vreg_96 = COPY killed %1
78 %3:vreg_96 = COPY killed %2
79 S_NOP 0, implicit %3.sub2
80 S_NOP 0, implicit %3.sub1