llvm-project.git/llvm/test/CodeGen/ARM/cmp.ll, branch users/nico/python-2

ARM: use target-specific SUBS node when combining cmp with cmov.

2018-12-03T11:16:21+00:00

This has two positive effects. First, using a custom node prevents
recombination leading to an infinite loop since the output DAG is notionally a
little more complex than the input one. Using a flag-setting instruction also
allows the subtraction to be folded with the related comparison more easily.

https://reviews.llvm.org/D53190

llvm-svn: 348122

[ARM] Materialise some boolean values to avoid a branch

2018-02-16T09:23:59+00:00

This patch combines some cases of ARMISD::CMOV for integers that arise in comparisons of the form

  a != b ? x : 0
  a == b ? 0 : x

and that currently (e.g. in Thumb1) are emitted as branches.

Differential Revision: https://reviews.llvm.org/D34515

llvm-svn: 325323

[ARM] Swap cmp operands for automatic shifts

2017-10-25T08:33:06+00:00

Swap the compare operands if the lhs is a shift and the rhs isn't,
as in arm and T2 the shift can be performed by the compare for its
second operand.

Differential Revision: https://reviews.llvm.org/D39004

llvm-svn: 316562