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[Bug target/53659] ARM: Using -mcpu=cortex-a9 option results in bad performance for Cortex-A9 processor in C-Ray phoronix benchmark
- From: "tulipawn at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 19 Sep 2016 17:43:02 +0000
- Subject: [Bug target/53659] ARM: Using -mcpu=cortex-a9 option results in bad performance for Cortex-A9 processor in C-Ray phoronix benchmark
- Auto-submitted: auto-generated
- References: <bug-53659-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53659
--- Comment #4 from PeteVine <tulipawn at gmail dot com> ---
I've just done the obvious and run the resulting ARMv7 binaries on a Cortex A53
in aarch32 mode and the difference is there (GCC 6.2.1 and 7.0.0) so I can
confirm the issue is present to this day.
Cortex-A5 vs Cortex-A9 codegen yields a 0.81x performance ratio.