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Author SHA1 Message Date
David Green baa94ef03b [ARM] Check that CPSR does not have other uses 
Fix up rL356335 by checking that CPSR is not read between
the compare and the branch.

llvm-svn: 356349
 2019-03-17 21:36:15 +00:00
David Green e0b48a8015 [ARM] Search backwards for CMP when combining into CBZ 
The constant island pass currently only looks at the instruction immediately
before a branch for a CMP to fold into a CBZ/CBNZ. This extends it to search
backwards for the instruction that defines CPSR. We need to ensure that the
register is not overridden between the CMP and the branch.

Differential Revision: https://reviews.llvm.org/D59317

llvm-svn: 356336
 2019-03-17 16:11:22 +00:00
David Green 30673299d4 [ARM] Add some CBZ constant island tests. NFC 
llvm-svn: 356335
 2019-03-17 16:00:21 +00:00