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The `assume` attribute is a way to provide additional, arbitrary information to the optimizer. For now, assumptions are restricted to strings which will be accumulated for a function and emitted as comma separated string function attribute. The key of the LLVM-IR function attribute is `llvm.assume`. Similar to `llvm.assume` and `__builtin_assume`, the `assume` attribute provides a user defined assumption to the compiler. A follow up patch will introduce an LLVM-core API to query the assumptions attached to a function. We also expect to add more options, e.g., expression arguments, to the `assume` attribute later on. The `omp [begin] asssumes` pragma will leverage this attribute and expose the functionality in the absence of OpenMP. Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D91979
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
//===- Assumptions.cpp ------ Collection of helpers for assumptions -------===//
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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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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Assumptions.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/IR/Function.h"
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using namespace llvm;
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bool llvm::hasAssumption(Function &F,
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const KnownAssumptionString &AssumptionStr) {
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const Attribute &A = F.getFnAttribute(AssumptionAttrKey);
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if (!A.isValid())
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return false;
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assert(A.isStringAttribute() && "Expected a string attribute!");
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SmallVector<StringRef, 8> Strings;
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A.getValueAsString().split(Strings, ",");
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return llvm::any_of(Strings, [=](StringRef Assumption) {
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return Assumption == AssumptionStr;
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});
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}
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StringSet<> llvm::KnownAssumptionStrings({
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"omp_no_openmp", // OpenMP 5.1
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"omp_no_openmp_routines", // OpenMP 5.1
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"omp_no_parallelism", // OpenMP 5.1
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});
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