[PATCH] D69514: [InstCombine] Expand usub_sat patterns to handle constants

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri added a comment.

Thank you for looking into this.



================
Comment at: llvm/test/Transforms/InstCombine/unsigned_saturated_sub.ll:214-215
 ; CHECK-LABEL: @max_sub_ult_c2(
-; CHECK-NEXT:    [[CMP:%.*]] = icmp ult i32 [[A:%.*]], 2
-; CHECK-NEXT:    [[SUB:%.*]] = add i32 [[A]], -2
-; CHECK-NEXT:    [[SEL:%.*]] = select i1 [[CMP]], i32 [[SUB]], i32 0
----------------
In this pattern either one of these two instructions must be one-use and go away.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69514/new/

https://reviews.llvm.org/D69514