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[IR2Vec] Consider only reachable BBs and non-debug instructions #143476

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Jun 17, 2025
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[IR2Vec] Consider only reachable BBs and non-debug instructions #143476

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13 changes: 9 additions & 4 deletions llvm/lib/Analysis/IR2Vec.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,9 @@

#include "llvm/Analysis/IR2Vec.h"

#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Support/Debug.h"
Expand Down Expand Up @@ -190,7 +192,8 @@ Embedding SymbolicEmbedder::getOperandEmbedding(const Value *Op) const {
void SymbolicEmbedder::computeEmbeddings(const BasicBlock &BB) const {
Embedding BBVector(Dimension, 0);

for (const auto &I : BB) {
// We consider only the non-debug and non-pseudo instructions
for (const auto &I : BB.instructionsWithoutDebug()) {
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Does this actually matter? LLVM migrated to debug records recently, so I don't believe modern frontends will actually produce debug instructions, although not too familiar with all that infrastructure.

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Right. We just want to ensure we consider only non-debug, non-pseudo instructions. Some of the old ll files in tests still have debug instructions.

Embedding InstVector(Dimension, 0);

const auto OpcVec = lookupVocab(I.getOpcodeName());
Expand All @@ -215,9 +218,11 @@ void SymbolicEmbedder::computeEmbeddings(const BasicBlock &BB) const {
void SymbolicEmbedder::computeEmbeddings() const {
if (F.isDeclaration())
return;
for (const auto &BB : F) {
computeEmbeddings(BB);
FuncVector += BBVecMap[&BB];

// Consider only the basic blocks that are reachable from entry
for (const BasicBlock *BB : depth_first(&F)) {
computeEmbeddings(*BB);
FuncVector += BBVecMap[BB];
}
}

Expand Down