[PATCH] D108091: [AggressiveInstCombine] Add shift left instruction to `TruncInstCombine` DAG

[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.

I'm not sure how much will this catch, but LG.
@spatel ?



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Comment at: llvm/test/Transforms/AggressiveInstCombine/trunc_shifts.ll:4
 
 define i16 @shl_1_commute(i8 %x) {
 ; CHECK-LABEL: @shl_1_commute(
----------------
Pedantic nitpick: commute means `mul %x, %y   <=>   mul %y, %x`
Here you want to use `negative_test` in place of `not_commute`, and drop `commute`.


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  https://reviews.llvm.org/D108091/new/

https://reviews.llvm.org/D108091