--- Comment #3 from bearophile_h...@eml.cc 2012-08-10 19:49:18 PDT ---
(In reply to comment #1)
> This is a well known Optlink bug, though I don't have the bugzilla number
> You're wrong about it impeding optimizations compared with dynamically
> allocating it, for a couple reasons:
This is a discussion better fit for the D newsgroup.
In attach there are 3 nearly identical C programs, that use a 2D global cache
matrix to perform a certain simple (but not stupid) computation.
The test0 uses a dynamically allocated "array" of pointers to "arrays". The
test1 uses a static array of dynamically allocated rows, and the test2 uses a
fully static 2D matrix. Compiling with GCC 4.7.1 with "-std=c99 -Ofast -flto
-s" the run-times are 6.52, 6.07 and 4.95 seconds. The more the GCC compiler
knows statically about the arrays, the more efficient binary it produces.
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