[PATCH][Aarch64] v2: Arithmetic overflow subv patterns [Patch 3/4]

[Michael Collison]

Updated previous patch:

https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00508.html

With coding style feedback from Richard Sandiford: (that also apply to this patch)

 https://gcc.gnu.org/ml/gcc-patches/2018-06/msg00508.html

Bootstrapped and tested on aarch64-linux-gnu. Okay for trunk?

2018-05-31  Michael Collison  <michael.collison@arm.com>
	    Richard Henderson <rth@redhat.com>

	* config/aarch64/aarch64.md (subv<GPI>4, usubv<GPI>4): New patterns.
	(subti): Handle op1 zero.
	(subvti4, usub4ti4): New.
	(*sub<GPI>3_compare1_imm): New.
	(sub<GPI>3_carryinCV): New.
	(*sub<GPI>3_carryinCV_z1_z2, *sub<GPI>3_carryinCV_z1): New.
	(*sub<GPI>3_carryinCV_z2, *sub<GPI>3_carryinCV): New.




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