As it's causing some bot failures (and per request from kbarton).
This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.
llvm-svn: 358546
Summary:
* Add checks for store. That is needed because GlobalsAA is called
twice in the current pipeline with different sets of Function passes
following it. However, the loads are eliminated using instcombine
which happens everywhere. On the other hand, DeadStoreElimination is
performed only once so by checking for store we'll be able to catch
more cases when GlobalsAA is invalidated unintentionally.
* Add empty function above/below the test so that we don't depend on
the relative order of instcombine/dead-store-elimination and the
pass that invalidates the analysis (inside the same
FunctionPassManager).
Reviewers: kristof.beyls
Reviewed By: kristof.beyls
Subscribers: llvm-commits, n.bozhenov
Differential Revision: https://reviews.llvm.org/D32015
Patch by Andrei Elovikov <andrei.elovikov@intel.com>
llvm-svn: 300553
A few benchmarks with lots of accesses to global variables in the hot
loops regressed a lot since r266399, which added the
SpeculativeExecution pass to the default pipeline. The problem is that
this pass doesn't mark Globals Alias Analysis as preserved. Globals
Alias Analysis is computed in a module pass, whereas
SpeculativeExecution is a function pass, and a lot of passes dependent
on the Globals Alias Analysis to optimize these benchmarks are also
function passes. As such, the Globals Alias Analysis information cannot
be recomputed between SpeculativeExecution and the following function
passes needing that information.
SpeculativeExecution doesn't invalidate Globals Alias Analysis, so mark
it as such to fix those performance regressions.
Differential Revision: http://reviews.llvm.org/D19806
llvm-svn: 268370
Eric Christopher