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https://github.com/c64scene-ar/llvm-6502.git
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529919ff31
Summary: Now that the DataLayout is a mandatory part of the module, let's start cleaning the codebase. This patch is a first attempt at doing that. This patch is not exactly NFC as for instance some places were passing a nullptr instead of the DataLayout, possibly just because there was a default value on the DataLayout argument to many functions in the API. Even though it is not purely NFC, there is no change in the validation. I turned as many pointer to DataLayout to references, this helped figuring out all the places where a nullptr could come up. I had initially a local version of this patch broken into over 30 independant, commits but some later commit were cleaning the API and touching part of the code modified in the previous commits, so it seemed cleaner without the intermediate state. Test Plan: Reviewers: echristo Subscribers: llvm-commits From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231740 91177308-0d34-0410-b5e6-96231b3b80d8
58 lines
2.4 KiB
C++
58 lines
2.4 KiB
C++
//===- Loads.h - Local load analysis --------------------------------------===//
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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 declares simple local analyses for load instructions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_LOADS_H
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#define LLVM_ANALYSIS_LOADS_H
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#include "llvm/IR/BasicBlock.h"
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namespace llvm {
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class AliasAnalysis;
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class DataLayout;
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class MDNode;
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/// isSafeToLoadUnconditionally - Return true if we know that executing a load
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/// from this value cannot trap. If it is not obviously safe to load from the
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/// specified pointer, we do a quick local scan of the basic block containing
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/// ScanFrom, to determine if the address is already accessed.
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bool isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom,
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unsigned Align);
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/// FindAvailableLoadedValue - Scan the ScanBB block backwards (starting at
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/// the instruction before ScanFrom) checking to see if we have the value at
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/// the memory address *Ptr locally available within a small number of
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/// instructions. If the value is available, return it.
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///
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/// If not, return the iterator for the last validated instruction that the
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/// value would be live through. If we scanned the entire block and didn't
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/// find something that invalidates *Ptr or provides it, ScanFrom would be
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/// left at begin() and this returns null. ScanFrom could also be left
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///
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/// MaxInstsToScan specifies the maximum instructions to scan in the block.
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/// If it is set to 0, it will scan the whole block. You can also optionally
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/// specify an alias analysis implementation, which makes this more precise.
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///
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/// If AATags is non-null and a load or store is found, the AA tags from the
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/// load or store are recorded there. If there are no AA tags or if no access
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/// is found, it is left unmodified.
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Value *FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
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BasicBlock::iterator &ScanFrom,
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unsigned MaxInstsToScan = 6,
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AliasAnalysis *AA = nullptr,
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AAMDNodes *AATags = nullptr);
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}
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#endif
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