r255428 - in /trunk/gcc: ChangeLog config/arm/a...

[ramana@gcc.gnu.org]

Author: ramana
Date: Tue Dec  5 16:32:55 2017
New Revision: 255428

URL: https://gcc.gnu.org/viewcvs?rev=255428&root=gcc&view=rev
Log:
[Patch ARM] Fix probe_stack constraint.

The probe_stack pattern uses r0 as a fixed register. This can cause issues if we have auto-increment instructions coming out that have r0 as the base register. 

Tested with a bootstrap and regression run. richi reports that the original issue was fixed in the run. I did consider whether probe_stack_range was affected but it all comes back to probe_stack pattern so I think we are ok.

I don't have a testcase that seems to provoke this but it seems to be default on most distributions so I'm expecting the testcoverage to come from there.

Applied.

Ramana

PR target/82248

* config/arm/arm.md (probe_stack) : Use the 'o' constraint.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/arm/arm.md