Arthur Eubanks 2eade1dba4 [WPD] Use new llvm.public.type.test intrinsic for potentially publicly visible classes ... Turning on opaque pointers has uncovered an issue with WPD where we currently pattern match away `assume(type.test)` in WPD so that a later LTT doesn't resolve the type test to undef and introduce an `assume(false)`. The pattern matching can fail in cases where we transform two `assume(type.test)`s into `assume(phi(type.test.1, type.test.2))`. Currently we create `assume(type.test)` for all virtual calls that might be devirtualized. This is to support `-Wl,--lto-whole-program-visibility`. To prevent this, all virtual calls that may not be in the same LTO module instead use a new `llvm.public.type.test` intrinsic in place of the `llvm.type.test`. Then when we know if `-Wl,--lto-whole-program-visibility` is passed or not, we can either replace all `llvm.public.type.test` with `llvm.type.test`, or replace all `llvm.public.type.test` with `true`. This prevents WPD from trying to pattern match away `assume(type.test)` for public virtual calls when failing the pattern matching will result in miscompiles. Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D128955		2022-07-26 08:01:08 -07:00
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CMakeLists.txt	Fix bot failure by adding needed dependence	2021-09-24 12:43:10 -07:00
llvm-lto.cpp	[WPD] Use new llvm.public.type.test intrinsic for potentially publicly visible classes	2022-07-26 08:01:08 -07:00