Re-reapply "[IR] Move optional data in llvm::Function into a hungoff uselist"
Make personality functions, prefix data, and prologue data hungoff
operands of Function.
This is based on the email thread "[RFC] Clean up the way we store
optional Function data" on llvm-dev.
Thanks to sanjoyd, majnemer, rnk, loladiro, and dexonsmith for feedback!
Includes a fix to scrub value subclass data in dropAllReferences. Does not
use binary literals.
Differential Revision: http://reviews.llvm.org/D13829
llvm-svn: 256095
diff --git a/llvm/lib/Transforms/IPO/GlobalDCE.cpp b/llvm/lib/Transforms/IPO/GlobalDCE.cpp
index 1cc6574..9b276ed 100644
--- a/llvm/lib/Transforms/IPO/GlobalDCE.cpp
+++ b/llvm/lib/Transforms/IPO/GlobalDCE.cpp
@@ -215,14 +215,8 @@
// any globals used will be marked as needed.
Function *F = cast<Function>(G);
- if (F->hasPrefixData())
- MarkUsedGlobalsAsNeeded(F->getPrefixData());
-
- if (F->hasPrologueData())
- MarkUsedGlobalsAsNeeded(F->getPrologueData());
-
- if (F->hasPersonalityFn())
- MarkUsedGlobalsAsNeeded(F->getPersonalityFn());
+ for (Use &U : F->operands())
+ MarkUsedGlobalsAsNeeded(cast<Constant>(U.get()));
for (BasicBlock &BB : *F)
for (Instruction &I : BB)