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Author SHA1 Message Date
Daan Sprenkels 464b9aeafe [InstCombine] Transform extelt-trunc -> bitcast-extelt 
Canonicalize the case when a scalar extracted from a vector is
truncated.  Transform such cases to bitcast-then-extractelement.
This will enable erasing the truncate operation.

This commit fixes PR45314.

reviewers: spatel

Differential revision: https://reviews.llvm.org/D76983
 2020-03-31 11:53:41 +02:00
Sanjay Patel bc60cdcc3f [InstCombine] add test for trunc-extelt; NFC 
Goes with D76983
 2020-03-30 09:43:03 -04:00
Daan Sprenkels 24562c6588 [InstCombine] Add tests for trunc (extelt x); (NFC) 
Baseline tests for D76983 (PR45314)

Differential Revision: https://reviews.llvm.org/D77024
 2020-03-29 17:30:54 -04:00