[PATCH] D96304: [Thumb2] support `movs pc, lr` alias for `subs pc, lr, #0`/`eret`

[David Spickett via Phabricator via llvm-commits]

DavidSpickett accepted this revision.
DavidSpickett added a comment.
This revision is now accepted and ready to land.

LGTM with the one comment added.



================
Comment at: llvm/lib/Target/ARM/ARMInstrThumb2.td:4147
 }
+def : t2InstAlias<"movs${p}\tpc, lr", (t2SUBS_PC_LR 0, pred:$p)>;
+def : t2InstAlias<"movs${p}.w\tpc, lr", (t2SUBS_PC_LR 0, pred:$p)>;
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Here please cite the armarmv7:
```
B9.3.19 SUBS PC, LR (Thumb)
In the Thumb instruction set, MOVS{<c>}{<q>} PC, LR is a pseudo-instruction for SUBS{<c>}{<q>} PC, LR, #0.
```



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https://reviews.llvm.org/D96304