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* [ARM, Thumb1] Prevent ARMTargetLowering::isLegalAddressingMode from ↵Evgeny Astigeevich2017-08-241-0/+122
accepting illegal modes ARMTargetLowering::isLegalAddressingMode can accept illegal addressing modes for the Thumb1 target. This causes generation of redundant code and affects performance. This fixes PR34106: https://bugs.llvm.org/show_bug.cgi?id=34106 Differential Revision: https://reviews.llvm.org/D36467 llvm-svn: 311649
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