[PATCH] D34378: AMDGPU: Fix crash with undef vreg input operand

[Stanislav Mekhanoshin via Phabricator via llvm-commits]

rampitec added inline comments.


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Comment at: lib/Target/AMDGPU/SIFoldOperands.cpp:472
 
     MachineInstr *Def = MRI.getVRegDef(Op.getReg());
+    if (Def && Def->isMoveImmediate()) {
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arsenm wrote:
> rampitec wrote:
> > getUniqueVRegDef?
> I think that should only ever be used post-SSA. This is an SSA pass, so the concern isn't whether or not there are multiple defs of the same register
If works fine past SSA in general, so I believe it is better to fix that as well.


https://reviews.llvm.org/D34378