Prime text sections to improve branch locality in large object files.
llvm-svn: 31969
diff --git a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
index 7ac4233..b5962ea 100644
--- a/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
+++ b/llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp
@@ -543,6 +543,19 @@
// 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;