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

From: "Kyrylo Tkachov" <kyrylo dot tkachov at arm dot com>
To: "gcc-patches" <gcc-patches at gcc dot gnu dot org>
Cc: "Richard Earnshaw" <Richard dot Earnshaw at arm dot com>, "Ramana Radhakrishnan" <Ramana dot Radhakrishnan at arm dot com>
Date: Thu, 1 Aug 2013 14:05:50 +0100
Subject: [PATCH][ARM] Emit canonical form for constant subtraction in minmax_arithsi_non_canon

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.

Attachment: minmax_canon_minus.patch
Description: Binary data

Follow-Ups:
- Re: [PATCH][ARM] Emit canonical form for constant subtraction in minmax_arithsi_non_canon
  - From: Richard Earnshaw

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