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on any current target and aren't optimized in DAGCombiner. Instead of using intermediate nodes, expand the operations, choosing between simple loads/stores, target-specific code, and library calls, immediately. Previously, the code to emit optimized code for these operations was only used at initial SelectionDAG construction time; now it is used at all times. This fixes some cases where rep;movs was being used for small copies where simple loads/stores would be better. This also cleans up code that checks for alignments less than 4; let the targets make that decision instead of doing it in target-independent code. This allows x86 to use rep;movs in low-alignment cases. Also, this fixes a bug that resulted in the use of rep;stos for memsets of 0 with non-constant memory size when the alignment was at least 4. It's better to use the library in this case, which can be significantly faster when the size is large. This also preserves more SourceValue information when memory intrinsics are lowered into simple loads/stores. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49572 91177308-0d34-0410-b5e6-96231b3b80d8
37 lines
1.1 KiB
C++
37 lines
1.1 KiB
C++
//==-- llvm/Target/TargetSubtarget.h - Target Information --------*- C++ -*-==//
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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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//
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// This file describes the subtarget options of a Target machine.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETSUBTARGET_H
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#define LLVM_TARGET_TARGETSUBTARGET_H
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namespace llvm {
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//===----------------------------------------------------------------------===//
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///
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/// TargetSubtarget - Generic base class for all target subtargets. All
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/// Target-specific options that control code generation and printing should
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/// be exposed through a TargetSubtarget-derived class.
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///
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class TargetSubtarget {
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TargetSubtarget(const TargetSubtarget&); // DO NOT IMPLEMENT
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void operator=(const TargetSubtarget&); // DO NOT IMPLEMENT
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protected: // Can only create subclasses...
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TargetSubtarget();
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public:
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virtual ~TargetSubtarget();
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};
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} // End llvm namespace
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#endif
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