| Issue |
97533
|
| Summary |
Assertion failure in TwoAddressInstructionPass
|
| Labels |
backend:X86,
llvm:crash
|
| Assignees |
|
| Reporter |
nikic
|
```llvm
; RUN: llc < %s
target triple = "x86_64-unknown-linux-gnu"
define ptr @test(ptr %ptr, i8 %arg, i1 %cond) {
entry:
br i1 %cond, label %if, label %exit
if:
%idx = zext i8 %arg to i64
%gep1 = getelementptr ptr, ptr %ptr, i64 %idx
%ptr2 = load ptr, ptr %gep1, align 8
%gep2 = getelementptr i64, ptr %ptr2, i64 %idx
br label %exit
exit:
%phi = phi ptr [ %gep2, %if ], [ null, %entry ]
ret ptr %phi
}
```
Results in:
```
llc: /home/npopov/repos/llvm-project/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp:1461: bool (anonymous namespace)::TwoAddressInstructionPass::collectTiedOperands(MachineInstr *, TiedOperandMap &): Assertion `SrcReg && SrcMO.isUse() && "two address instruction invalid"' failed.
```
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