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Provide a shortcut for MCObjectStreamer when emitting fills.

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Reduces runtime of i386-large-relocations.s by 10x in Release builds, even more
in Debug+Asserts builds.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164945 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-10-01 15:14:14 +00:00
parent cfb65293c3
commit f0070f2a97
2 changed files with 10 additions and 0 deletions
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2
include/llvm/MC/MCObjectStreamer.h
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@ -81,6 +81,8 @@ public:
const MCSymbol *Label);
virtual void EmitGPRel32Value(const MCExpr *Value);
virtual void EmitGPRel64Value(const MCExpr *Value);
virtual void EmitFill(uint64_t NumBytes, uint8_t FillValue,
unsigned AddrSpace);
virtual void FinishImpl();
/// @}

8
lib/MC/MCObjectStreamer.cpp
View File

@ -270,6 +270,14 @@ void MCObjectStreamer::EmitGPRel64Value(const MCExpr *Value) {
DF->getContents().resize(DF->getContents().size() + 8, 0);
}
void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
unsigned AddrSpace) {
assert(AddrSpace == 0 && "Address space must be 0!");
// FIXME: A MCFillFragment would be more memory efficient but MCExpr has
// problems evaluating expressions across multiple fragments.
getOrCreateDataFragment()->getContents().append(NumBytes, FillValue);
}
void MCObjectStreamer::FinishImpl() {
// Dump out the dwarf file & directory tables and line tables.
const MCSymbol *LineSectionSymbol = NULL;