[Bug target/53659] ARM: Using -mcpu=cortex-a9 option results in bad performance for Cortex-A9 processor in C-Ray phoronix benchmark

["tulipawn at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53659

--- Comment #12 from PeteVine <tulipawn at gmail dot com> ---
Nice, PR68664 patch has fixed the issue.

FWIW, unlike previously, running on a Cortex-A53, showed perfect alignment with
core type (-mfpu=vfpv3) on the first run:

Cortex-A8
Rendering took: 1 seconds (1801 milliseconds)

Cortex-A5
Rendering took: 1 seconds (1708 milliseconds)

Cortex-A7
Rendering took: 1 seconds (1699 milliseconds)

Cortex-A9
Rendering took: 1 seconds (1644 milliseconds)

Cortex-A15
Rendering took: 1 seconds (1637 milliseconds)

whereas using -mfpu=vfpv4 favours Cortex-A5 code's execution:

Cortex-A8
Rendering took: 1 seconds (1803 milliseconds)

Cortex-A5
Rendering took: 1 seconds (1506 milliseconds)

Cortex-A7
Rendering took: 1 seconds (1636 milliseconds)

Cortex-A9
Rendering took: 1 seconds (1645 milliseconds)

Cortex-A15
Rendering took: 1 seconds (1643 milliseconds)

but that's probably expected. Not sure about A8's codegen performance though.