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Author SHA1 Message Date
Eli Friedman 89b80f1239 [ARM] Lower "(x<<c) > 0x80000000U" to "lsls" on Thumb1. 
This is extremely specific, but saves three instructions when it's
legal.  I don't think the code can be usefully generalized.

Differential Revision: https://reviews.llvm.org/D65351

llvm-svn: 367492
 2019-07-31 23:19:21 +00:00
Eli Friedman 2f45ec1c39 [ARM] Transform compare of masked value to shift on Thumb1. 
Thumb1 has very limited immediate modes, so turning an "and" into a
shift can save multiple instructions.

It's possible to simplify the generated code for test2 and test3 in
cmp-and-fold.ll a little more, but I'll implement that as a followup.

Differential Revision: https://reviews.llvm.org/D65175

llvm-svn: 367491
 2019-07-31 23:17:34 +00:00