diff options
| author | Dan Gohman <gohman@apple.com> | 2010-04-02 00:14:16 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2010-04-02 00:14:16 +0000 |
| commit | c671347fcbd815b961b3b080aa8c53fb18071462 (patch) | |
| tree | 4fd3e4a5153687ee105299fa12d0302072263915 /llvm/lib | |
| parent | cdf40bed1bbe3c47e39f3d9f081361f57cdcedff (diff) | |
| download | bcm5719-llvm-c671347fcbd815b961b3b080aa8c53fb18071462.tar.gz bcm5719-llvm-c671347fcbd815b961b3b080aa8c53fb18071462.zip | |
Make globalopt refine global variable alignment.
llvm-svn: 100160
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/IPO/GlobalOpt.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp index ddff5ef8b36..c09e78e2693 100644 --- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp +++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp @@ -1880,6 +1880,7 @@ bool GlobalOpt::OptimizeFunctions(Module &M) { bool GlobalOpt::OptimizeGlobalVars(Module &M) { bool Changed = false; + TargetData *TD = getAnalysisIfAvailable<TargetData>(); for (Module::global_iterator GVI = M.global_begin(), E = M.global_end(); GVI != E; ) { GlobalVariable *GV = GVI++; @@ -1889,11 +1890,16 @@ bool GlobalOpt::OptimizeGlobalVars(Module &M) { // 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); } + // Refine the alignment value. + if (TD && GV->hasDefinitiveInitializer()) { + unsigned Align = TD->getPreferredAlignment(GV); + if (Align > GV->getAlignment()) + GV->setAlignment(Align); + } // Do more involved optimizations if the global is internal. if (!GV->isConstant() && GV->hasLocalLinkage() && GV->hasInitializer()) |
