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Re: Drop REG_CROSSING_JUMP when converting to a conditional return

From: Jeff Law <law at redhat dot com>
To: gcc-patches at gcc dot gnu dot org, rsandifo at linux dot vnet dot ibm dot com
Date: Tue, 14 Jan 2014 07:32:09 -0700
Subject: Re: Drop REG_CROSSING_JUMP when converting to a conditional return
Authentication-results: sourceware.org; auth=none
References: <87bnzekfx0 dot fsf at sandifor-thinkpad dot stglab dot manchester dot uk dot ibm dot com>

On 01/14/14 03:37, Richard Sandiford wrote:

While experimenting with a patch to use conditional returns, I hit a case
where a conditional jump between hot and cold sections was being converted
into a conditional return.  The new jump still had the REG_CROSSING_JUMP
and later passes were confused by the combination of that and a return
JUMP_LABEL.

The jump is now returning directly from the current section rather than
crossing sections within the function, so I think we should just drop
the note.

Tested on s390x-linux-gnu with some local patches.  OK to install?

Thanks,
Richard


gcc/
	* jump.c (redirect_jump_2): Remove REG_CROSSING_JUMP notes when
	converting a conditional jump into a conditional return.

OK.

jeff

References:
- Drop REG_CROSSING_JUMP when converting to a conditional return
  - From: Richard Sandiford

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