From 01b97dd01eec1197d79fceb7229f5ec233994de3 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Mon, 23 Nov 2009 16:22:21 +0000 Subject: Make ConstantFoldConstantExpression recursively visit the entire 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 --- lib/Transforms/IPO/GlobalOpt.cpp | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'lib/Transforms/IPO/GlobalOpt.cpp') diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp index 442f2fb655..4635d0e61c 100644 --- a/lib/Transforms/IPO/GlobalOpt.cpp +++ b/lib/Transforms/IPO/GlobalOpt.cpp @@ -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(GV->getInitializer())) { + TargetData *TD = getAnalysisIfAvailable(); + 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); -- cgit v1.2.3-70-g09d2