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knc1 · 06-10-2012, 03:21 PM

Both of those are new enough that you should be able to use:
-mfloat-abi=softfp -mfpu=vfp
And still run on either the ARMv6l (VFPv2) or the ARMv7l (VFPv3) even with the rest of the Kindle libraries built as 'softfloat'.

If you have a chance, give that a try on your compile command line and see if the resultant binary will still run on your Kindle.
It should make a difference to mpeg123 when you use the floating point hardware.

Edit: Still haven't found a reference to that: 'l' (ell) but the only thing I have found so far is that it probably indicate VFPlite (the 'slow' VFP hardware - which trades silicon area for clock cycles).

And I am not sure if even gcc-4.6 has instruction scheduling for the VFPlite (slow FPU) hardware. Need to RTFM but I don't expect to find it before gcc-4.7

06-10-2012, 03:21 PM	#44
knc1 Going Viral Posts: 17,212 Karma: 18210809 Join Date: Feb 2012 Location: Central Texas Device: No K1, PW2, KV, KOA	Both of those are new enough that you should be able to use: -mfloat-abi=softfp -mfpu=vfp And still run on either the ARMv6l (VFPv2) or the ARMv7l (VFPv3) even with the rest of the Kindle libraries built as 'softfloat'. If you have a chance, give that a try on your compile command line and see if the resultant binary will still run on your Kindle. It should make a difference to mpeg123 when you use the floating point hardware. Edit: Still haven't found a reference to that: 'l' (ell) but the only thing I have found so far is that it probably indicate VFPlite (the 'slow' VFP hardware - which trades silicon area for clock cycles). And I am not sure if even gcc-4.6 has instruction scheduling for the VFPlite (slow FPU) hardware. Need to RTFM but I don't expect to find it before gcc-4.7 Last edited by knc1; 06-10-2012 at 05:13 PM.