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Prime text sections to improve branch locality in large object files. 

llvm-svn: 31969
This commit is contained in:
Jim Laskey 2006-11-28 18:21:52 +00:00
parent f4e2e009d9
commit ec05b046c7
1 changed files with 13 additions and 0 deletions
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13
llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
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@ -543,6 +543,19 @@ bool DarwinAsmPrinter::doInitialization(Module &M) {
// Darwin wants symbols to be quoted if they have complex names.
Mang->setUseQuotes(true);
// Prime text sections so they are adjacent. This reduces the likelihood a
// large data or debug section causes a branch to exceed 16M limit.
SwitchToTextSection(".section __TEXT,__textcoal_nt,coalesced,"
"pure_instructions");
if (TM.getRelocationModel() == Reloc::PIC_) {
SwitchToTextSection(".section __TEXT,__picsymbolstub1,symbol_stubs,"
"pure_instructions,32");
} else if (TM.getRelocationModel() == Reloc::DynamicNoPIC) {
SwitchToTextSection(".section __TEXT,__symbol_stub1,symbol_stubs,"
"pure_instructions,16");
}
SwitchToTextSection(TAI->getTextSection());
// Emit initial debug information.
DW.BeginModule(&M);
return false;