On Wed, Dec 11, 2013 at 10:21 AM, Simon Hausmann <simon.hausm...@digia.com>wrote:
> > The other option for 5.2 would be to do runtime detection of SSE2 and > > enable/disable the JIT according to that. > > I think the main issue with run-time detection is that we need -msse2 > -mfpmath=sse in order to get reliable math results (no 80-bit temps) that > match with our test expectations, when using the interpreter or non-inline > math functions. > I have not looked into the actual code, I know everybody hates dlopen and I haven't even though about the performance implications but, what about this? - Move "maybe-SSE2" code to a separate library - Compile that library twice, one with SSE2 (-msse2 -mfmath=sse), the other without SSE2 - Ship both versions of the library: libwhatever_sse2.so, libwhatever_i486.so - On runtime, check for SSE2 and load the appropriate version The same approach could be used in other parts of Qt, or even for having SSE2, SSE2, etc versions of that library/plugin -- Pau Garcia i Quiles http://www.elpauer.org (Due to my workload, I may need 10 days to answer)
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