1 # RUN: llc -o - %s -mtriple=amdgcn-amd-amdhsa-opencl -run-pass=simple-register-coalescing | FileCheck %s
3 # Checks for a bug where subregister liveranges were not properly pruned for
4 # an IMPLCITI_DEF that gets removed completely.
6 # CHECK-LABEL: name: func
7 # IMPLICIT_DEF should be gone without llc hitting assertion failures.
8 # CHECK-NOT: IMPLICIT_DEF
10 tracksRegLiveness: true
13 undef %5.sub1 = V_MOV_B32_e32 0, implicit $exec
15 S_CBRANCH_VCCZ %bb.2, implicit undef $vcc
18 %1 : sreg_32_xm0 = S_MOV_B32 0
19 undef %0.sub0 : sreg_64 = COPY %1
21 %4 : vreg_64 = COPY killed %0
22 %5 : vreg_64 = IMPLICIT_DEF
23 %6 : vreg_64 = COPY killed %4
26 %2 : vgpr_32 = V_CVT_F32_I32_e32 killed %5.sub1, implicit $mode, implicit $exec
29 %3 : vgpr_32 = V_CVT_F32_I32_e32 killed %6.sub1, implicit $mode, implicit $exec