Thinking a bit more, I think the VFP emulation for older hardware could
be a viable option to have all the packages compiled with -mfpu=vfp. I
can't estimate the performance difference between softfloat and VFP
emulation but, if the performance on Xscale is visibly affected, we
still have the
On Thu, 2009-01-22 at 15:58 +, Loïc Minier wrote:
[Ack, I do understand there's a performance hit when gong via libgcc,
but I was hoping this could be a good compromise between not using
hardware FPU at all and generating traps on systems without FPU.]
I haven't looked but I think there is
By default, gcc generates software floating point, so for this
particular case no additional command line options are needed.
Using -mfloat-abi=softfp indeed creates binaries compatible with Debian
(soft-float) since the function calling convention uses standard
registers and stack for passing
If -mfpu=vfp is enabled, the compiler will generate VFP instructions in
the asm code directly rather than calls to the libgcc soft-float code.
Even if the libgcc soft-float function could be replaced with the VFP
instructions, you still get an additional branch to those operations and
probably
Please ignore the legal disclaimer at the end of the previous post (I
used the wrong SMTP server and it got appended automatically). Thanks.
--
armel gcc default optimisations
https://bugs.launchpad.net/bugs/303232
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The -mtune=cortex-a8 will optimise the generated code for the Cortex-A8
(ARMv7 processor) pipeline but not affecting the instruction set used
(which is still ARMv5T). The resulting code will be optimal on ARMv7 but
there may be a slight drop (if any) on other architecture versions.
Without the
Public bug reported:
The NPTL lock-related files in glibc ports still use the deprecated SWP
instructions. These instructions have been deprecated since ARMv6 and
there are even ARMv7 CPUs (Cortex-A9) with these disabled by default.
The CONFIG_AEABI support in the Linux kernel provides kernel
Public bug reported:
Binary package hint: gcc-4.3
For the armel Ubuntu port, since it is optimised for ARMv7, it would be
good to have gcc automatically generating code equivalent to the flags
below so that all the applications would benefit, unrelated to whether
CFLAGS was set or not:
I got the same problem. It might be related to this bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=417037
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firefox-3.0 breaks with NFS home directory
https://bugs.launchpad.net/bugs/237970
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