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Commit f258a15b authored by Evan Cheng's avatar Evan Cheng
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Canonicalize (srl (bswap x), 16) to (rotr (bswap x), 16) if the high 16 bits 

of x are zero. This optimizes rev + lsr 16 to rev16.

rdar://10750814

llvm-svn: 151230
parent 91f5ae50
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