[PM] Introduce an analysis set used to preserve all analyses over
a function's CFG when that CFG is unchanged.
This allows transformation passes to simply claim they preserve the CFG
and analysis passes to check for the CFG being preserved to remove the
fanout of all analyses being listed in all passes.
I've gone through and removed or cleaned up as many of the comments
reminding us to do this as I could.
Differential Revision: https://reviews.llvm.org/D28627
llvm-svn: 292054
diff --git a/llvm/lib/Transforms/Scalar/SROA.cpp b/llvm/lib/Transforms/Scalar/SROA.cpp
index 4b1dad4..9b54679 100644
--- a/llvm/lib/Transforms/Scalar/SROA.cpp
+++ b/llvm/lib/Transforms/Scalar/SROA.cpp
@@ -4235,9 +4235,8 @@
if (!Changed)
return PreservedAnalyses::all();
- // FIXME: Even when promoting allocas we should preserve some abstract set of
- // CFG-specific analyses.
PreservedAnalyses PA;
+ PA.preserveSet<CFGAnalyses>();
PA.preserve<GlobalsAA>();
return PA;
}
