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# 19:09:21 |
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# 19:25:47 |
tholm |
y_morin: arm-cortex_a8-linux-gnueabi sample file need some improvement. I believe that you need to add CT_ARCH_FPU="neon", that will increase the performance |
# 19:33:54 |
y_morin |
tholm: this sample is a soft-float sample, nto a hard-float, so this won't have any effect. |
# 19:34:08 |
y_morin |
tholm: However, we can add another sampel that enables hard-float, yes. |
# 19:37:53 |
tholm |
y_morin: CT_ARCH_FPU="neon" if you add this line, it will work on hard or softfp, and the performance it will be much better. |
# 19:38:57 |
tholm |
anyway I can send you my .config file, if you want |
# 19:39:33 |
y_morin |
tholm: No, I meant: this sample is explcitly a soft-float one (neon is optional on cortex-a8, IIRC). So, we want to provide a sample than runs on all cortex-a8. |
# 19:40:06 |
y_morin |
tholm: OTOH, we can *add* another sample (basically the same) which enables neon. Like there is for cortex-a9 |
# 19:40:32 |
tholm |
I think all cortex-a8 got vfpv3 |
# 19:40:44 |
tholm |
and simd |
# 19:40:52 |
tholm |
(NEON) |
# 19:41:22 |
y_morin |
tholm: I am not sure either way: the situation with mandatory/optional neon (and jazelle, thumb...) on different famillies is a bit muddy at best... |
# 19:42:02 |
y_morin |
tholm: https://en.wikipedia.org/wiki/Cortex-A8 <- neon is optional (TBC) |
# 19:45:14 |
tholm |
umm, I dont agree with neon is optional |
# 19:45:40 |
tholm |
http://www.arm.com/products/processors/cortex-a/cortex-a8.php |
# 19:46:25 |
tholm |
neon is always present |
# 19:48:51 |
y_morin |
tholm: Seems you are right: https://en.wikipedia.org/wiki/ARM_architecture#Advanced_SIMD_.28NEON.29 |
# 19:49:14 |
y_morin |
tholm: neon is mandatory on a8, but optional on a9. Sigh... This is getting complicated... :-( |
# 19:51:25 |
tholm |
Cortex a9 uses vfpv4-neon |
# 19:52:00 |
y_morin |
tholm: http://www.arm.com/products/processors/cortex-a/cortex-a9.php <- Optional NEON⢠|
# 19:59:41 |
tholm |
I see, anyways you can use -mfpu=neon and -mfloat-abi=(softfp|hard) on cortex-a8 |
# 20:00:30 |
y_morin |
tholm: Yes, it seems so. :-) |
# 20:06:02 |
dalias |
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# 20:06:12 |
tholm |
take a look this line->>CT_ARCH_ARCH="armv7-a" CT_ARCH_CPU="cortex-a8" CT_ARCH_TUNE="cortex-a8" |
# 20:06:13 |
tholm |
You can use CT_ARCH_ARCH="armv7-a" CT_ARCH_CPU="" CT_ARCH_TUNE="cortex-a8" OR CT_ARCH_ARCH="" CT_ARCH_CPU="cortex-a8" CT_ARCH_TUNE="cortex-a8" |
# 20:07:07 |
tholm |
you don't need configure the three argument at the same time |
# 20:08:49 |
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# 20:09:15 |
tholm |
http://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html |
# 20:09:22 |
y_morin |
tholm: That's (mostly) right. But setting all of them makes it explicit. The internal mechanism in gcc is a bit obscur and not trivial to follow, hence the reason for the three. |
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# 22:24:48 |
y_morin |
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