[Bug target/77468] [7 Regression] C-ray regression on Aarch64

[jgreenhalgh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77468

--- Comment #15 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
(In reply to Aldy Hernandez from comment #13)
> The aarch64-linux-gnu regression originally reported for -mcpu=cortex-a53
> was caused by:
> 
> commit 08993ad1c669cab64baf352f79cd7f8584dd8e0c
> Author: jgreenhalgh <jgreenhalgh@138bc75d-0d04-0410-961f-82ee72b054a4>
> Date:   Thu Oct 1 09:33:40 2015 +0000
> 
>     [Patch 2/2 ARM/AArch64] Add a new Cortex-A53 scheduling model
> 
>         * config/arm/aarch-common-protos.h
>         (aarch_accumulator_forwarding): New.
>         (aarch_forward_to_shift_is_not_shifted_reg): Likewise.
>         * config/arm/aarch-common.c (aarch_accumulator_forwarding): New.
>         (aarch_forward_to_shift_is_not_shifted_reg): Liekwise.
>         * config/arm/cortex-a53.md: Rewrite.
> 
> 
> 
>     git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@228324
> 138bc75d-0d04-0410-961f-82ee72b054a4

Could you dump me the assembly of the hot loop before and after that change -
I'll see if we're doing anything particularly offensive with the scheduling,
though I still don't have access to the source code for this benchmark so a
reduced testcase would be appreciated.