Florian Hahn 4fd7f95ec0 [SCEVExpander] Avoid re-using existing casts if it means updating users. ... Currently the SCEVExpander tries to re-use existing casts, even if they are not exactly at the insertion point it was asked to create the cast. To do so in some case, it creates a new cast at the insertion point and updates all users to use the new cast. This behavior is problematic, because it changes the IR outside of the instructions created during the expansion. Therefore we cannot completely undo all changes made during expansion. This re-use should be only an extra optimization, so only using the new cast in the expanded instructions should not be a correctness issue. There are many cases equivalent instructions are created during expansion. This patch also adjusts findInsertPointAfter to skip instructions inserted during expansion. This enables re-using existing casts without the renaming any uses, by picking a better insertion point. Reviewed By: efriedma, lebedev.ri Differential Revision: https://reviews.llvm.org/D84399		2020-08-09 13:25:17 +01:00
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basic-with-memchecks.ll
basic.ll
bounds-expansion-bug.ll
convergent-no-cross-partition-checks.ll
crash-in-memcheck-generation.ll
diagnostics-with-hotness.ll
diagnostics.ll
disable_nonforced_enable.ll
disable_nonforced.ll
followup.ll
metadata.ll
no-if-convert.ll
outside-use.ll
pr28443.ll
program-order.ll
scev-inserted-runtime-check.ll
symbolic-stride.ll
unknown-bounds-for-memchecks.ll