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Make ConstantFoldConstantExpression recursively visit the entire

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ConstantExpr, not just the top-level operator. This allows it to
fold many more constants.

Also, make GlobalOpt call ConstantFoldConstantExpression on
GlobalVariable initializers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89659 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-11-23 16:22:21 +00:00
parent 8f3817f505
commit 01b97dd01e
5 changed files with 31 additions and 5 deletions
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9
lib/Transforms/IPO/GlobalOpt.cpp
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@ -1898,6 +1898,15 @@ bool GlobalOpt::OptimizeGlobalVars(Module &M) {
// Global variables without names cannot be referenced outside this module.
if (!GV->hasName() && !GV->isDeclaration())
GV->setLinkage(GlobalValue::InternalLinkage);
// Simplify the initializer.
if (GV->hasInitializer())
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(GV->getInitializer())) {
TargetData *TD = getAnalysisIfAvailable<TargetData>();
Constant *New = ConstantFoldConstantExpression(CE, TD);
if (New && New != CE)
GV->setInitializer(New);
}
// Do more involved optimizations if the global is internal.
if (!GV->isConstant() && GV->hasLocalLinkage() &&
GV->hasInitializer())
Changed |= ProcessInternalGlobal(GV, GVI);