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4 Commits

Author SHA1 Message Date
Eric Christopher 6c901623c0 Migrate AArch64 except for TTI and AsmPrinter away from getSubtargetImpl. 
llvm-svn: 227293
 2015-01-28 03:51:33 +00:00
Chad Rosier 7bb413e3ba [AArch64] Check Dest Register Liveness in CondOpt pass. 
Our internal test reveals such case should not be transformed:

  cmp x17, #3
  b.lt .LBB10_15
  ...
  subs x12, x12, #1
  b.gt .LBB10_1

where x12 is a liveout, becomes:

  cmp x17, #2
  b.le .LBB10_15
  ...
  subs x12, x12, #2
  b.ge .LBB10_1

Unable to provide test case as it's difficult to reproduce on community branch.

http://reviews.llvm.org/D6048
Patch by Zhaoshi Zheng <zhaoshiz@codeaurora.org>!

llvm-svn: 220987
 2014-10-31 19:02:38 +00:00
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