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0fb89f87e0
MCRelaxableFragment previously kept a copy of MCSubtargetInfo and MCInst to enable re-encoding the MCInst later during relaxation. A copy of MCSubtargetInfo (instead of a reference or pointer) was needed because the feature bits could be modified by the parser. This commit replaces the MCSubtargetInfo copy in MCRelaxableFragment with a constant reference to MCSubtargetInfo. The copies of MCSubtargetInfo are kept in MCContext, and the target parsers are now responsible for asking MCContext to provide a copy whenever the feature bits of MCSubtargetInfo have to be toggled. With this patch, I saw a 4% reduction in peak memory usage when I compiled verify-uselistorder.lto.bc using llc. rdar://problem/21736951 Differential Revision: http://reviews.llvm.org/D14346 llvm-svn: 253127
33 lines
941 B
C++
33 lines
941 B
C++
//===-- MCTargetAsmParser.cpp - Target Assembly Parser ---------------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCTargetAsmParser.h"
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using namespace llvm;
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MCTargetAsmParser::MCTargetAsmParser(MCTargetOptions const &MCOptions,
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const MCSubtargetInfo &STI)
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: AvailableFeatures(0), ParsingInlineAsm(false), MCOptions(MCOptions),
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STI(&STI)
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{
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}
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MCTargetAsmParser::~MCTargetAsmParser() {
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}
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MCSubtargetInfo &MCTargetAsmParser::copySTI() {
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MCSubtargetInfo &STICopy = getContext().getSubtargetCopy(getSTI());
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STI = &STICopy;
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return STICopy;
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}
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const MCSubtargetInfo &MCTargetAsmParser::getSTI() const {
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return *STI;
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}
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