4 Commits

Author	SHA1	Message	Date
Florian Hahn	250de7388b	[llvm-reduce] Add reduction for special globals like llvm.used. ... This patch adds a reduction of 'special' globals that lead to further reductions (e.g. alias or regular globals reduction) being less efficient because there are special constraints on values referenced in those special globals. For example, values in @llvm.used and @llvm.compiler.used need to be named, so replacing all uses of an alias/global with undef or a different unnamed constant results in invalid IR. More details: https://llvm.org/docs/LangRef.html#intrinsic-global-variables Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D90302	2020-11-11 11:25:05 +00:00
Florian Hahn	23c8da25ef	[llvm-reduce] Add reduction for aliases. ... This patch adds a new reduction pass that tries to remove aliases. It runs early, as most of those likely can be removed up-front in practice. This substantially improves llvm-reduce for IR generated by the swift compiler, which can generate a lot of aliases which lead to lots of invalid reductions. Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D90260	2020-10-28 13:11:19 +00:00
Florian Hahn	4b1fbdbd8e	[llvm-reduce] Extend test to also use special globals.	2020-10-28 12:11:55 +00:00
Florian Hahn	7d6b58302a	[llvm-reduce] Add test with some aliases.	2020-10-27 19:29:48 +00:00