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by potkor
4864 days ago
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This paper from 2011 compares autovectorization in GCC against two proprietary compilers, from Intel and IBM: http://polaris.cs.uiuc.edu/~garzaran/doc/pact11.pdf GCC got a 23% speedup vs 15% for XLC and 28% for ICC. GCC did well considering the proprietary compilers' narrow focus and corporate resources. BTW, Fortran compilers for the 1980's supers did autovectorization pretty well. Funny that we've made it so hard today. |
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