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Switch from -O2 to -O3 in the makefile #454

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noloader opened this issue Aug 4, 2017 · 1 comment
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Switch from -O2 to -O3 in the makefile #454

noloader opened this issue Aug 4, 2017 · 1 comment
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@noloader
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noloader commented Aug 4, 2017

The makefile uses -O2 as the default optimization level.

The source code can support -O3 as the optimization level. In fact, we support -O5, -Os and -Ofast. We regularly test them in cryptest.sh.

At -O3, GCC and other compilers will vectorize, meaning they will use SIMD units, like SSE and NEON, more frequently. When the compiler takes an opportunity it is often a non-trivial speedup.

Also see Switch from -O2 to -O3 as optimization default? on the mailing list.
noloader referenced this issue Aug 4, 2017
@noloader
Switch from -O2 to -O3 in the makefile (Issue 454)
18a0565 
Also see https://groups.google.com/d/msg/cryptopp-users/AEiGyjq15tw/GBAyDA6fBgAJ
@noloader noloader closed this as completed Aug 4, 2017
noloader added a commit that referenced this issue Aug 30, 2017
@noloader
Use optimization level -O3 for release testing (GH #454)
1aecb3d 
This change should have been made with Commit 18a0565
@noloader
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Cut-in at Commit 18a05659f38d and Commit 1aecb3d4ad47.

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