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Sam Parker
4afcc6dc52
[ARM] Add v8m.base pattern for add negative imm
The v8m.base ISA contains movw, which can operate on an unsigned 16-bit value. Add the pattern that converts an add with a negative value, that could fit into 16-bits when negated, into a sub with that positive value. Differential Revision: https://reviews.llvm.org/D57942 llvm-svn: 353692
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