[PATCH] D146786: [CodeGenPrepare][RISCV] Correct the MathUsed flag for shouldFormOverflowOp

[Craig Topper via Phabricator via llvm-commits]

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For add, if we match the constant edge case the add isn't used by
the compare so we shouldn't check for 2 users.

For sub, the compare is not a user of the sub so if the sub exists
at all the math is used.

This regresses RISC-V which I will work on other patches for.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146786

Files:
  llvm/lib/CodeGen/CodeGenPrepare.cpp
  llvm/test/CodeGen/RISCV/overflow-intrinsics.ll

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