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Author SHA1 Message Date
David Green b4f36a2196 [ARM] Mark 255 and 65535 as cheap for Thumb1 "And" 
This prevents Constant Hoisting from pulling the constant out of the block,
allowing us to still produce LDRH/UXTH nodes. LDRB/UXTB (255) is already cheap
by the default getIntImmCost, but I've added it for clarity.

Differential Revision: https://reviews.llvm.org/D57671

llvm-svn: 353040
 2019-02-04 11:58:48 +00:00
David Green 75d79f472e [ARM] Add testcases for D57671. NFC 
llvm-svn: 353039
 2019-02-04 11:50:14 +00:00