llvm-project

f5dd45d4 - [SCEV] Use computeMaxBECountForLT for howManyGreaterThans. (#224863)

[SCEV] Use computeMaxBECountForLT for howManyGreaterThans. (#224863) Instead of checking for overflow of IV > RHS we can instead check ~IV < ~RHS. This allows removing canIVOverflowOnGT, by extending canIVOverflowOnLT and computeMaxBECountForLT to invert the operands if needed, replacing hand rolled logic in howManyGreaterThans. This improves results in some cases, because computeMaxBECountForLT covers some additional cases: https://github.com/dtcxzyw/llvm-opt-benchmark-nightly/pull/1371. This is also the last step in preparation for using howManyLessThans for howManyGreaterThans. PR: https://github.com/llvm/llvm-project/pull/224863