[PATCH] D91343: [InstCombine] Optimize away the unnecessary multi-use sign-extend

[Roman Lebedev via Phabricator via llvm-commits]

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

LGTM



================
Comment at: llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp:919-921
+    // amount, this is probably a zero/sign extension, which may be unnecessary,
+    // if the demanded bits are already within original operand. So, return the
+    // original operand instead.
----------------
s/if the demanded bits are already within original operand/if we do not demand any of the new sign bits/


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https://reviews.llvm.org/D91343