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Prime text sections to improve branch locality in large object files.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31969 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -543,6 +543,19 @@ bool DarwinAsmPrinter::doInitialization(Module &M) {
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// Darwin wants symbols to be quoted if they have complex names.
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Mang->setUseQuotes(true);
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// Prime text sections so they are adjacent. This reduces the likelihood a
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// large data or debug section causes a branch to exceed 16M limit.
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SwitchToTextSection(".section __TEXT,__textcoal_nt,coalesced,"
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"pure_instructions");
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if (TM.getRelocationModel() == Reloc::PIC_) {
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SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
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"pure_instructions,32");
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} else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
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SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
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"pure_instructions,16");
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}
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SwitchToTextSection(TAI->getTextSection());
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// Emit initial debug information.
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DW.BeginModule(&M);
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return false;
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