[PATCH][ARM] Emit canonical form for constant subtraction in minmax_arithsi_non_canon

[Kyrylo Tkachov]

Hi all,

I noticed that the minmax_arithsi_non_canon splitter had a case where it would
generate a MINUS rtx with an immediate. The canonical form is PLUS with
negated immediate. This patch fixes that.

Tested arm-none-eabi on qemu with ARMv7-a, ARMv8-a, with and without -mthumb.

Ok for trunk?

Thanks,
Kyrill


2013-08-01  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* config/arm/arm.md (minmax_arithsi_non_canon): Emit canonical RTL
form
	when subtracting a constant.
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