Default release compilation with -O3 #86

issue sipa opened this issue on November 2, 2014

sipa commented at 9:36 AM on November 2, 2014: contributor

@theuni it seems -O3 performs significantly better (at least on my system) compared to -O2. Is there a way to make that default?
gmaxwell commented at 4:07 AM on November 23, 2014: contributor
Sure, after AC_INIT but before AC_PROG_CC add a
```
if test -z $CFLAGS; then
    CFLAGS='-O3 -g'
fi
```
Prog_CC will only set the default CFLAGS if they're not already set.
theuni commented at 5:12 PM on November 24, 2014: contributor

Sorry for the late response. Exactly what @gmaxwell said.
theuni commented at 6:12 PM on November 24, 2014: contributor

Note that it may be worth checking to see if there's any major feature (or handful) enabled by -O3 that accounts for a majority of the performance boost. If so, we could just enable those and leave the -O alone. Obvious ones to try would include: -ftree-vectorize, -finline-functions
sipa commented at 1:47 AM on December 9, 2014: contributor

See #146.
dcousens commented at 2:48 AM on April 16, 2015: contributor

Since https://github.com/bitcoin/secp256k1/pull/146 was merged, close this?
gmaxwell closed this on Apr 16, 2015

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