| Issue |
76031
|
| Summary |
[AMDGPU] SIFixSGPRCopies breaks functions with VALU copy to SGPR
|
| Labels |
backend:AMDGPU
|
| Assignees |
|
| Reporter |
arsenm
|
```
# RUN: llc -march=amdgcn -mcpu=tonga -run-pass=si-fix-sgpr-copies -o - %s | FileCheck %s
# Copy to $sgpr0 is disconnected and becomes an IMPLICIT_DEF
# Inserted V_AND_B32 defines virtual register after use.
---
name: si_fix_sgpr_copies_breaks_function
tracksRegLiveness: true
machineFunctionInfo:
isEntryFunction: true
body: |
bb.0:
liveins: $sgpr0
%0:sgpr_32 = COPY $sgpr0
%2:sreg_32 = S_MOV_B32 16
%3:sreg_32 = S_LSHR_B32 %0, killed %2, implicit-def dead $scc
%4:sreg_32 = COPY killed %3
%5:sreg_32 = S_MOV_B32 -32768
%7:vgpr_32 = COPY killed %5
%6:vgpr_32 = V_XOR_B32_e64 killed %4, %7, implicit $exec
%8:sreg_32 = S_MOV_B32 65535
%10:sreg_32 = COPY %6
%9:sreg_32 = S_AND_B32 killed %8, killed %10, implicit-def dead $scc
$sgpr0 = COPY %9
SI_RETURN_TO_EPILOG $sgpr0
...
```
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