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Narrowing stores when the target doesn't support the narrow version forces the target to expand into a load-modify-store sequence, which is highly suboptimal. The information narrowing throws away (legality of the inverse transform) is hard to re-analyze. If the target doesn't support a store of the narrow type, don't narrow even in pre-legalize mode. No test as this is DAGCombiner and depends on target bits. llvm-svn: 370576 |
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