From 0d7db6f79a61803fff87d12d9c75c0f54d863d10 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Tue, 14 Feb 2006 22:18:23 +0000 Subject: [PATCH] If we have zero initialized data with external linkage, use .zerofill to emit it (instead of .space), saving a bit of space in the .o file. For example: int foo[100]; int bar[100] = {}; when compiled with C++ or -fno-common results in shrinkage from 1160 to 360 bytes of space. The X86 backend can also do this on darwin. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26185 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/PowerPC/PPCAsmPrinter.cpp | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/lib/Target/PowerPC/PPCAsmPrinter.cpp b/lib/Target/PowerPC/PPCAsmPrinter.cpp index e66b0e86e26..9a3df608b43 100644 --- a/lib/Target/PowerPC/PPCAsmPrinter.cpp +++ b/lib/Target/PowerPC/PPCAsmPrinter.cpp @@ -539,13 +539,20 @@ bool DarwinAsmPrinter::doFinalization(Module &M) { if (C->isNullValue() && /* FIXME: Verify correct */ (I->hasInternalLinkage() || I->hasWeakLinkage() || - I->hasLinkOnceLinkage())) { - SwitchSection(".data", I); + I->hasLinkOnceLinkage() || + (I->hasExternalLinkage() && !I->hasSection()))) { if (Size == 0) Size = 1; // .comm Foo, 0 is undefined, avoid it. - if (I->hasInternalLinkage()) + if (I->hasExternalLinkage()) { + O << "\t.globl " << name << '\n'; + O << "\t.zerofill __DATA, __common, " << name << ", " + << Size << ", " << Align; + } else if (I->hasInternalLinkage()) { + SwitchSection(".data", I); O << LCOMMDirective << name << "," << Size << "," << Align; - else + } else { + SwitchSection(".data", I); O << ".comm " << name << "," << Size; + } O << "\t\t; '" << I->getName() << "'\n"; } else { switch (I->getLinkage()) {