1# RUN: not --crash llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -verify-machineinstrs  -run-pass=machine-scheduler -verify-misched -o /dev/null %s  2>&1  | FileCheck %s
2
3# CHECK: *** Bad machine code: No live subrange at use ***
4# CHECK-NEXT: - function:    at_least_one_value_should_be_defined_by_this_mask
5# CHECK-NEXT: - basic block: %bb.0
6# CHECK-NEXT: - instruction: 48B	dead undef %2.sub0:vreg_128 = COPY %0.sub0:vreg_128
7# CHECK-NEXT: - operand 1:   %0.sub0:vreg_128
8# CHECK-NEXT: - interval:    %0 [16r,48r:0)  0@16r L000000000000000C [16r,32r:0)  0@16r weight:0.000000e+00
9
10# This used to assert with: !SR.empty() && "At least one value should be defined by this mask"
11
12# This MIR is invalid and should be caught by the verifier. %0.sub0 is
13# used, but not defined. There are also lanes in %0 that are not used
14# or defined anywhere. Previously there was an assertion in the
15# LiveInterval computation, which was more confusing. The invalid
16# LiveRange should be produced and the verifier will catch it.
17
18---
19name: at_least_one_value_should_be_defined_by_this_mask
20tracksRegLiveness: true
21body:             |
22  bb.0:
23
24    undef %0.sub1:vreg_128 = V_MOV_B32_e32 0, implicit $exec
25    %1:vreg_128 = COPY %0
26    undef %2.sub0:vreg_128 = COPY %0.sub0
27
28...
29