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2017 Oct 25
2
[PATCH/RFC] Modifying reassociate for improved CSE: fairly large perf gains
...ld come up with and it gives us some unreasonably large perf gains, and of course, optimizes “foo” correctly down to 4 multiplies.
Any thoughts? The gains here are… well, more than I expected, to say the least ;-)
—escha
Note 1: see how (1.0 - u2) is a common factor here.
DST_C ( dstGrid ) = (1.0-OMEGA)*SRC_C ( srcGrid ) + DFL1*OMEGA*rho*(1.0 - u2);
DST_N ( dstGrid ) = (1.0-OMEGA)*SRC_N ( srcGrid ) + DFL2*OMEGA*rho*(1.0 + uy*(4.5*uy + 3.0) - u2);
DST_S ( dstGrid ) = (1.0-OMEGA)*SRC_S ( srcGrid ) + DFL2*OMEG...