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Re: [PATCH] arm: Generate correct const_ints (PR86640)

On 15/08/18 09:21, Tamar Christina wrote:
Hi All,

I'd like to ask for permissions to backport of this patch to GCC 8?

Ok. Please bundle the testcase in the backport as well.



-----Original Message-----
From: Kyrill Tkachov <>
Sent: Tuesday, July 31, 2018 12:55
To: Segher Boessenkool <>
Subject: Re: [PATCH] arm: Generate correct const_ints (PR86640)

On 31/07/18 12:38, Segher Boessenkool wrote:
On Tue, Jul 31, 2018 at 09:02:56AM +0100, Kyrill Tkachov wrote:
Hi Segher,

On 30/07/18 18:37, Segher Boessenkool wrote:
On Mon, Jul 30, 2018 at 03:55:30PM +0100, Kyrill Tkachov wrote:
Hi Segher,

On 30/07/18 14:14, Segher Boessenkool wrote:
In arm_block_set_aligned_vect 8-bit constants are generated as
zero- extended const_ints, not sign-extended as required.  Fix that.

Tamar tested the patch (see PR); no problems were found.  Is this
okay for trunk?

The patch is okay but please add the testcase from the PR to
gcc.dg/ or somewhere else generic (it's not arm-specific).
It only failed with very specific options, which aren't valid on
every ARM config either I think?

-O3 -mfpu=neon -mfloat-abi=hard -march=armv7-a
This is a fairly common Arm configuration that is tested by many
people by default, so you wouldn't need to add any arm-specific
directives. Just putting it in one of the generic C tests folders
would be enough.
Ah ok, so just dg-options -O3 will do?
yes, that should be enough.


(As before, I have no reasonable way to test this).


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