5 Commits

Author	SHA1	Message	Date
Pete Cooper	27fb0e9851	[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. llvm-svn: 235532	2015-04-22 18:05:13 +00:00
Eric Christopher	4aec24da82	Migrate AArch64 except for TTI and AsmPrinter away from getSubtargetImpl. ... llvm-svn: 227293	2015-01-28 03:51:33 +00:00
Chad Rosier	14722ca1a2	[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	9bc5bd5f9a	[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	ea6ab99806	[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