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[PATCH], PR target/79947, Fix compiler segmentation fault with -Ofast -mno-powerpc-gfxopt

From: Michael Meissner <meissner at linux dot vnet dot ibm dot com>
To: gcc-patches at gcc dot gnu dot org, Segher Boessenkool <segher at kernel dot crashing dot org>, David Edelsohn <dje dot gcc at gmail dot com>, Bill Schmidt <wschmidt at linux dot vnet dot ibm dot com>
Date: Tue, 14 Mar 2017 17:01:53 -0400
Subject: [PATCH], PR target/79947, Fix compiler segmentation fault with -Ofast -mno-powerpc-gfxopt
Authentication-results: sourceware.org; auth=none

In PR target/79947, the code for using the float reciprocal square root
estimate instruction did not check if the -mpowerpc-gfxopt option was enabled.
The code needs this option to generate a conditional floating point move.

I have checked this patch on the trunk, and it fixes the problem and it does
not cause any regressions.  Is it ok to apply to the trunk?  Assuming there are
no additional problems, can I apply the patch to the GCC 5 and 6 branches as
well?

[gcc]
2017-03-14  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/79947
	* config/rs6000/rs6000.h (TARGET_FRSQRTES): Add check for
	-mpowerpc-gfxopt.

[gcc/testsuite]
2017-03-14  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/79947
	* gcc.target/powerpc/pr79947.c: New test.

-- 
Michael Meissner, IBM
IBM, M/S 2506R, 550 King Street, Littleton, MA 01460-6245, USA
email: meissner@linux.vnet.ibm.com, phone: +1 (978) 899-4797

Attachment: pr79947.patch01b
Description: Text document

Follow-Ups:
- Re: [PATCH], PR target/79947, Fix compiler segmentation fault with -Ofast -mno-powerpc-gfxopt
  - From: Segher Boessenkool

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