PPC64: Poor StrictMath performance due to non-optimized compilation
gromero at linux.vnet.ibm.com
Tue Nov 22 00:41:34 UTC 2016
On 17-11-2016 20:47, White, Derek wrote:
> Hi Joe,
> Although neither a floating point expert (as I think I've proven to you over the years), or a gcc expert, I checked with our in-house gcc expert and got this following answer:
> "Yes using -fno-strict-aliasing fixes the issues. Also there are many forks of fdlibm which has this fixed including the code inside glibc. "
I've tried on PPC64 -O3 and -fno-strict-aliasing but it didn't work. Disabling
the FMA fixed the issue although.
Do you know if the gap between Math and StrictMath is also huge on aarch64?
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