6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
44 lines
1.7 KiB
C++
44 lines
1.7 KiB
C++
//===-- OverflowInstAnalysis.h - Utils to fold overflow insts ----*- 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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//
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// This file holds routines to help analyse overflow instructions
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// and fold them into constants or other overflow instructions
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_OVERFLOWINSTANALYSIS_H
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#define LLVM_ANALYSIS_OVERFLOWINSTANALYSIS_H
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namespace llvm {
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class Use;
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class Value;
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/// Match one of the patterns up to the select/logic op:
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/// %Op0 = icmp ne i4 %X, 0
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/// %Agg = call { i4, i1 } @llvm.[us]mul.with.overflow.i4(i4 %X, i4 %Y)
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/// %Op1 = extractvalue { i4, i1 } %Agg, 1
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/// %ret = select i1 %Op0, i1 %Op1, i1 false / %ret = and i1 %Op0, %Op1
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///
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/// %Op0 = icmp eq i4 %X, 0
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/// %Agg = call { i4, i1 } @llvm.[us]mul.with.overflow.i4(i4 %X, i4 %Y)
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/// %NotOp1 = extractvalue { i4, i1 } %Agg, 1
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/// %Op1 = xor i1 %NotOp1, true
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/// %ret = select i1 %Op0, i1 true, i1 %Op1 / %ret = or i1 %Op0, %Op1
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///
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/// Callers are expected to align that with the operands of the select/logic.
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/// IsAnd is set to true if the Op0 and Op1 are used as the first pattern.
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/// If Op0 and Op1 match one of the patterns above, return true and fill Y's
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/// use.
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bool isCheckForZeroAndMulWithOverflow(Value *Op0, Value *Op1, bool IsAnd,
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Use *&Y);
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bool isCheckForZeroAndMulWithOverflow(Value *Op0, Value *Op1, bool IsAnd);
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} // end namespace llvm
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#endif
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