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Implement global merge optimization for global variables.

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This commit implements two command line switches -global-merge-on-external
and -global-merge-aligned, and both of them are false by default, so this
optimization is disabled by default for all targets.

For ARM64, some back-end behaviors need to be tuned to get this optimization
further enabled.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208934 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jiangning Liu
2014-05-15 23:45:42 +00:00
parent 01a02d91dc
commit d5db8765d6
20 changed files with 448 additions and 68 deletions
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7
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
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@@ -946,8 +946,11 @@ bool AsmPrinter::doFinalization(Module &M) {
EmitVisibility(Name, Alias.getVisibility());
// Emit the directives as assignments aka .set:
OutStreamer.EmitAssignment(Name,
MCSymbolRefExpr::Create(Target, OutContext));
const MCExpr *Expr = MCSymbolRefExpr::Create(Target, OutContext);
if (uint64_t Offset = Alias.calculateOffset(*TM.getDataLayout()))
Expr = MCBinaryExpr::CreateAdd(Expr,
MCConstantExpr::Create(Offset, OutContext), OutContext);
OutStreamer.EmitAssignment(Name, Expr);
}
}