On 17/11/16 08:56, Thomas Preudhomme wrote:
On 16/11/16 10:30, Kyrill Tkachov wrote:
Hi Thomas,
On 03/11/16 16:52, Thomas Preudhomme wrote:
Hi,
When using a callee-saved register to save the frame pointer the Thumb-1
prologue fails to save the callee-saved register before that. For ARM and
Thumb-2 targets the frame pointer is handled as a special case but nothing is
done for Thumb-1 targets. This patch adds the same logic for Thumb-1 targets.
ChangeLog entries are as follow:
*** gcc/ChangeLog ***
2016-11-02 Thomas Preud'homme <thomas.preudho...@arm.com>
PR target/77904
* config/arm/arm.c (thumb1_compute_save_reg_mask): mark frame pointer
in save register mask if it is needed.
s/mark/Mark/
*** gcc/testsuite/ChangeLog ***
2016-11-02 Thomas Preud'homme <thomas.preudho...@arm.com>
PR target/77904
* gcc.target/arm/pr77904.c: New test.
Testing: Testsuite shows no regression when run with arm-none-eabi GCC
cross-compiler for Cortex-M0 target.
Is this ok for trunk?
I'd ask for a bootstrap, but this code is Thumb-1 only so it wouldn't affect
anything.
I can bootstrap for armv4t with --with-mode=thumb which would at least exercise
the path. I'll try such a bootstrap on qemu.
If you can get it to work, then yes please.
Can you just double-check that the new test passes on non-Thumb-1 configurations
as well?
It works well for ARMv7-A in ARM and Thumb mode.
Great, thanks again.
Kyrill
Best regards,
Thomas
