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llvm-mirror/include/llvm/Transforms/IPO/InferFunctionAttrs.h
Chandler Carruth 8beb86a806 [attrs] Extract the pure inference of function attributes into
a standalone pass.

There is no call graph or even interesting analysis for this part of
function attributes -- it is literally inferring attributes based on the
target library identification. As such, we can do it using a much
simpler module pass that just walks the declarations. This can also
happen much earlier in the pass pipeline which has benefits for any
number of other passes.

In the process, I've cleaned up one particular aspect of the logic which
was necessary in order to separate the two passes cleanly. It now counts
inferred attributes independently rather than just counting all the
inferred attributes as one, and the counts are more clearly explained.

The two test cases we had for this code path are both ... woefully
inadequate and copies of each other. I've kept the superset test and
updated it. We need more testing here, but I had to pick somewhere to
stop fixing everything broken I saw here.

Differential Revision: http://reviews.llvm.org/D15676

llvm-svn: 256466
2015-12-27 08:41:34 +00:00

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//===-- InferFunctionAttrs.h - Infer implicit function attributes ---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Interfaces for passes which infer implicit function attributes from the
/// name and signature of function declarations.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_IPO_INFERFUNCTIONATTRS_H
#define LLVM_TRANSFORMS_IPO_INFERFUNCTIONATTRS_H
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
namespace llvm {
/// A pass which infers function attributes from the names and signatures of
/// function declarations in a module.
class InferFunctionAttrsPass {
public:
static StringRef name() { return "InferFunctionAttrsPass"; }
PreservedAnalyses run(Module &M, AnalysisManager<Module> *AM);
};
/// Create a legacy pass manager instance of a pass to infer function
/// attributes.
Pass *createInferFunctionAttrsLegacyPass();
}
#endif // LLVM_TRANSFORMS_IPO_INFERFUNCTIONATTRS_H