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# 01:02:38 bhundven diorcety: +1
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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. :-)
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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
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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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