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Altera_Forum's avatar
Altera_Forum
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13 years ago

NIOS C compilation and optimization issue

11.1SP2 Eclipse Based NIOSII software build Tools OK, that looks foolish, however, this has happened. I was asked to provide the latency figures for an algorithm. I got different latenc...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

No need to quote all the post ....

If the object code is the same, then maybe the difference is caused by additional instruction cache loads because code is now sharing instruction cache lines (the overall address map will probably have changed).

The data addresses are unlikely to be significantly different - but might be.

Running code from tightly coupled instruction/data memory (and with the dynamic branch prediction disabled) I got consistent timings that match the expected values.