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On Sun, Nov 13, 2005 at 05:52:37PM +0200, Janne Blomqvist wrote:
I doubt it would be worth while to try to discriminate between ancient CPUs which lack hardware register renaming and those of the last 6 years which have that feature. CPUs like P-III and later do very well in pipelining code which assigns independent data to the same named register.
Another thing that it does is enabling -funroll-loops for matmul_* and matmull_*. This is actually a bigger performance booster than vectorizing, almost doubling performance.
I fear that this may be platform-dependant. Loop unrolling may be a big win for architectures with many registers, while on architectures with few registers, such as i686, it may cause performance degradation.
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