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[Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
- From: "andrewm.roberts at sky dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 05 Dec 2017 07:35:56 +0000
- Subject: [Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)
- Auto-submitted: auto-generated
- References: <bug-83206-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83206
--- Comment #15 from Andrew Roberts <andrewm.roberts at sky dot com> ---
Created attachment 42792
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42792&action=edit
/proc/cpuinfo fro rpi3 (cortex a-53) on aarch64
/proc/cpuinfo fro rpi3 (cortex a-53) on aarch64
while this is the same cpu as odroid-c2 running aarch64, it has much newer
kernel.
rpi: 4.14.3-1-ARCH
odroid-c2: 3.14.79-28-ARCH
Newer aarch64 kernels expose MIDR directly at:
/sys/devices/system/cpu/cpu0/regs/identification/midr_el1
but not the other control regs needed for FPU detection