fix two transposed lines duncan caught and add an explanatory comment.
llvm-svn: 89958
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@ -1064,12 +1064,15 @@ const Value *llvm::DecomposeGEPExpression(const Value *V, int64_t &BaseOffs,
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uint64_t Scale = TD->getTypeAllocSize(*GTI);
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uint64_t Scale = TD->getTypeAllocSize(*GTI);
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// Use GetLinearExpression to decompose the index into a C1*V+C2 form.
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unsigned Width = cast<IntegerType>(Index->getType())->getBitWidth();
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unsigned Width = cast<IntegerType>(Index->getType())->getBitWidth();
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APInt IndexScale(Width, 0), IndexOffset(Width, 0);
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APInt IndexScale(Width, 0), IndexOffset(Width, 0);
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Index = GetLinearExpression(Index, IndexScale, IndexOffset, TD);
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Index = GetLinearExpression(Index, IndexScale, IndexOffset, TD);
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Scale *= IndexScale.getZExtValue();
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// The GEP index scale ("Scale") scales C1*V+C2, yielding (C1*V+C2)*Scale.
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// This gives us an aggregate computation of (C1*Scale)*V + C2*Scale.
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BaseOffs += IndexOffset.getZExtValue()*Scale;
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BaseOffs += IndexOffset.getZExtValue()*Scale;
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Scale *= IndexScale.getZExtValue();
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// If we already had an occurrance of this index variable, merge this
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// If we already had an occurrance of this index variable, merge this
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