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[PATCH, middle-end]: Introduce TARGET_REJECT_COMBINED_INSN target hook

From: Uros Bizjak <ubizjak at gmail dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Oleg Endo <oleg dot endo at t-online dot de>, Richard Guenther <richard dot guenther at gmail dot com>, Jakub Jelinek <jakub at redhat dot com>, Yuri Rumyantsev <ysrumyan at gmail dot com>, Igor Zamyatin <izamyatin at gmail dot com>
Date: Thu, 23 Aug 2012 18:59:47 +0200
Subject: [PATCH, middle-end]: Introduce TARGET_REJECT_COMBINED_INSN target hook

Hello!

This patch introduces TARGET_REJECT_COMBINED_INSN target hook, so
targets are able to reject combinations of two or more insns. The hook
is called from recog_for_combine, so it is the target that has the
final say on the combined insn.

This target hook will be used in a follow-up x86 patch that rejects
instructions where hard registers don't fit into operand register
constraint.

2012-08-23  Uros Bizjak  <ubizjak@gmail.com>

	* target.def (reject_combined_insn): New target hook.
	* doc/tm.texi.in (TARGET_REJECT_COMBINED_INSN): New hook.
	* doc/tm.texi: Regenerated.
	* combine.c (recog_for_combine): Call targetm.reject_combined_insn
	to allow targets to reject combined insn.

Bootstrapped and regression tested on x86_64-pc-linux-gnu.

OK for mainline?

Uros.

Attachment: p.diff.txt
Description: Text document

Follow-Ups:
- Re: [PATCH, middle-end]: Introduce TARGET_REJECT_COMBINED_INSN target hook
  - From: Georg-Johann Lay
- Re: [PATCH, middle-end]: Introduce TARGET_REJECT_COMBINED_INSN target hook
  - From: Joseph S. Myers

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