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2 Commits

Author SHA1 Message Date
Chad Rosier a675e550ca [AArch64] CondOpt pass is missing FCMP instructions when searching backward for 
a CMP which defines the flags used by B.CC.

http://reviews.llvm.org/D6047
Patch by Zhaoshi Zheng <zhaoshiz@codeaurora.org>!

llvm-svn: 220961
 2014-10-31 15:17:36 +00:00
Jiangning Liu 1a486da543 [AArch64] Add pass to enable additional comparison optimizations by CSE. 
Patched by Sergey Dmitrouk.

This pass tries to make consecutive compares of values use same operands to
allow CSE pass to remove duplicated instructions. For this it analyzes
branches and adjusts comparisons with immediate values by converting:

GE -> GT
GT -> GE
LT -> LE
LE -> LT

and adjusting immediate values appropriately. It basically corrects two
immediate values towards each other to make them equal.

llvm-svn: 217220
 2014-09-05 02:55:24 +00:00