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# 5745b6ac 03-Dec-2018 Tim Northover <tnorthover@apple.com>

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

This has two positive effects. First, using a custom node prevents
recombination leading to an infinite loop since the output DAG is

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

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

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Revision tags: llvmorg-7.0.1-rc2, llvmorg-7.0.1-rc1, llvmorg-7.0.0, llvmorg-7.0.0-rc3, llvmorg-7.0.0-rc2, llvmorg-7.0.0-rc1, llvmorg-6.0.1, llvmorg-6.0.1-rc3, llvmorg-6.0.1-rc2, llvmorg-6.0.1-rc1, llvmorg-5.0.2, llvmorg-5.0.2-rc2, llvmorg-5.0.2-rc1, llvmorg-6.0.0, llvmorg-6.0.0-rc3
# d41059a9 16-Feb-2018 Roger Ferrer Ibanez <roger.ferreribanez@arm.com>

[ARM] Materialise some boolean values to avoid a branch

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

[ARM] Materialise some boolean values to avoid a branch

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

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Revision tags: llvmorg-6.0.0-rc2, llvmorg-6.0.0-rc1, llvmorg-5.0.1, llvmorg-5.0.1-rc3, llvmorg-5.0.1-rc2, llvmorg-5.0.1-rc1
# ccb209bb 25-Oct-2017 Sam Parker <sam.parker@arm.com>

[ARM] Swap cmp operands for automatic shifts

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.

Di

[ARM] Swap cmp operands for automatic shifts

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

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