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Re: [committed] Work around bug in powf function on HP-UX

From: John David Anglin <dave dot anglin at bell dot net>
To: dave dot anglin at bell dot net, John David Anglin <dave dot anglin at nrc-cnrc dot gc dot ca>
Cc: gcc-patches at gcc dot gnu dot org
Date: Sun, 10 Mar 2013 20:51:53 -0400
Subject: Re: [committed] Work around bug in powf function on HP-UX
References: <20130218164557.GA2332@hiauly1.hia.nrc.ca>

On 18-Feb-13, at 11:45 AM, John David Anglin wrote:

2013-02-18 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
	PR target/56347
	* config/pa/pa.c (pa_conditional_register_usage): On HP-UX, mark
	registers %fr12 and %fr12R as call used.

I committed the attached change. It no longer unconditionally clobbers %fr12 and %fr12R and instead uses special call patterns that clobber %fr12 to work around the problem. It is not perfect in that only direct calls are detected, but I think that is the best compromise.

Tested on hppa2.0w-hp-hpux11.11 and hppa64-hp-hpux11.11. Build tested on hppa-unknown-linux-gnu. Committed to trunk.

Dave
--
John David Anglin	dave.anglin@bell.net

Attachment: pa-powf.d.5.txt
Description: Text document

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