Sanjay Patel 3dee113ebc [InstCombine] fold insertelement into splat of same scalar ...

Forming the canonical splat shuffle improves analysis and
may allow follow-on transforms (although some possibilities
are missing as shown in the test diffs).

The backend generically turns these patterns into build_vector,
so there should be no codegen regressions. All targets are
expected to be able to lower splats efficiently.

llvm-svn: 365379

2019-07-08 19:48:52 +00:00

84 KiB

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