7f8b2e1b91
This was passing in all the parameters needed to construct a LegalizerHelper in the custom legalization, when it's simpler to just pass in the existing helper. This is slightly more annoying to use in the common case where you don't need the legalizer helper, but we could add back the common parameters back in addition to the helper. I didn't propagate this to all the internal target changes that this logically implies, but did update a sample one for legalizeMinNumMaxNum. This is in preparation for moving AMDGPU load/store legalization entirely into custom lowering. The current set of legalization actions is really constraining and not really capable of expressing all the actions needed to legalize loads/stores. In particular there's no way to express when the memory access itself needs to change size vs. the result type. There's also a lot of redundancy since the same split/widen actions need to be applied in both vector and scalar cases. All of the sub-cases logically belong as steps in the legalizer helper, but it will be easier to consider everything at once in custom lowering.
65 lines
2.4 KiB
C++
65 lines
2.4 KiB
C++
//===- ARMLegalizerInfo ------------------------------------------*- C++ -*-==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This file declares the targeting of the Machinelegalizer class for ARM.
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/// \todo This should be generated by TableGen.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
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#define LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
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#include "llvm/ADT/IndexedMap.h"
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#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
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#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
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#include "llvm/CodeGen/RuntimeLibcalls.h"
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#include "llvm/IR/Instructions.h"
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namespace llvm {
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class ARMSubtarget;
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/// This class provides the information for the target register banks.
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class ARMLegalizerInfo : public LegalizerInfo {
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public:
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ARMLegalizerInfo(const ARMSubtarget &ST);
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bool legalizeCustom(LegalizerHelper &Helper, MachineInstr &MI) const override;
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private:
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void setFCmpLibcallsGNU();
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void setFCmpLibcallsAEABI();
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struct FCmpLibcallInfo {
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// Which libcall this is.
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RTLIB::Libcall LibcallID;
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// The predicate to be used when comparing the value returned by the
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// function with a relevant constant (currently hard-coded to zero). This is
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// necessary because often the libcall will return e.g. a value greater than
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// 0 to represent 'true' and anything negative to represent 'false', or
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// maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is
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// needed, this should be CmpInst::BAD_ICMP_PREDICATE.
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CmpInst::Predicate Predicate;
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};
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using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>;
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// Map from each FCmp predicate to the corresponding libcall infos. A FCmp
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// instruction may be lowered to one or two libcalls, which is why we need a
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// list. If two libcalls are needed, their results will be OR'ed.
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using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>;
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FCmpLibcallsMapTy FCmp32Libcalls;
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FCmpLibcallsMapTy FCmp64Libcalls;
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// Get the libcall(s) corresponding to \p Predicate for operands of \p Size
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// bits.
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FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const;
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};
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} // End llvm namespace.
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#endif
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