21dad8e5cc
The code in the test is causing a crash in `SIInstrInfo.cpp`
`fixImplicitOperands()` in `MI.implicit_operands()`:
```
for (auto &Op : MI.implicit_operands()) {
```
MachineInstr.h:
```
mop_range implicit_operands() {
=> return operands_impl().drop_front(getNumExplicitOperands());
}
```
We are trying to drop 1 operand from the operands of MI which are 0.
By early returning we are no longer crashing at that point and we are
getting a more meaningful error message:
```
*** Bad machine code: Too few operands ***
- function: missing_operand_crash
- basic block: %bb.0 (0x5a9d30ced988)
- instruction: S_WAITCNT_DEPCTR
1 operands expected, but 0 given.
```
The code is still crashing at a different location, but at least we are
getting an error message.
This directory contains tests for the MIR file format parser and printer. It was necessary to split the tests across different targets as no single target covers all features available in machine IR. Tests for codegen passes should NOT be here but in test/CodeGen/sometarget. As a rule of thumb this directory should only contain tests using 'llc -run-pass none'.