[mercury-users] Field assignment optimisation

[Michael Day]

Hi Ralph,

> Can you send us your test program?  What optimization level are you
> using?  These intermediate structures certainly *should* be optimized
> away.

I'm only guessing at what is going on, but based on timing and mprof
output replacing the multiple field assignments with a single construction
gives quite a significant speedup.

The structure in question has 87 fields and there were 12 field
assignments.

The compilation grade is asm_fast.gc (and asm_fast.gc.prof) and the
compilation options include -O5 --intermodule-optimisation
--trans-intermod-opt.

Providing the entire program is not possible in this case however, as it
is rather large.

Best regards,

Michael

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