mirror of
https://github.com/revng/revng
synced 2026-06-21 14:07:57 +00:00
Ivan Krysak
34 lines
879 B
C++
34 lines
879 B
C++
#pragma once
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//
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// This file is distributed under the MIT License. See LICENSE.md for details.
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//
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#include "llvm/IR/PassManager.h"
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/// Transformation to shrink operand sizes where possible
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///
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/// This pass shrinks the operand of binary operators and comparison
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/// instructions if they are zero/sign-extended immediately before and after the
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/// instruction.
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///
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/// For instance:
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///
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/// %op1 = zext i32 0 to i64
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/// %op2 = zext i32 0 to i64
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/// %cmp = icmp ugt i64 %op1, %op2
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///
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/// Becomes:
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///
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/// %cmp = icmp ugt i32 0, 0
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///
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/// This enables other analyses (LazyValueInfo in particular) to obtain more
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/// accurate results.
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class ShrinkInstructionOperandsPass
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: public llvm::PassInfoMixin<ShrinkInstructionOperandsPass> {
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public:
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llvm::PreservedAnalyses run(llvm::Function &F,
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llvm::FunctionAnalysisManager &FAM);
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};
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