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5 Commits

Author SHA1 Message Date
Pete Cooper
c61f7144eb [AArch64] Use MachineRegisterInfo instead of LiveIntervals to calculate liveness. NFC. 
The CondOpt pass currently uses LiveIntervals to set the dead flag on a def.  This patch uses MachineRegisterInfo::use_empty instead as that is equivalent to the def being dead.

This removes an instance of LiveIntervals in the pass manager pipeline and saves 3.8% of compile time on llc conpiled for AArch64.

Reviewed by Chad Rosier and Zhaoshi.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235532 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-04-22 18:05:13 +00:00
Eric Christopher
b99395a7f7 Migrate AArch64 except for TTI and AsmPrinter away from getSubtargetImpl. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227293 91177308-0d34-0410-b5e6-96231b3b80d8
 2015-01-28 03:51:33 +00:00
Chad Rosier
b9ce924135 [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>!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220987 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-10-31 19:02:38 +00:00
Chad Rosier
66d3a86a9a [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>!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220961 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-10-31 15:17:36 +00:00
Jiangning Liu
b20b9bf9fd [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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217220 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-09-05 02:55:24 +00:00