[m-dev.] for review: zero uninstantiated fields of constructions

[Fergus Henderson]

On 04-Jun-1999, David Overton <dmo at cs.mu.OZ.AU> wrote:
>
> I've made this change.  Here are some timings for compiling
> make_hlds.m with various compilers (all compiled in the asm_fast.gc grade,
> running on murlibobo):
> 
> compiler built with -O6
> 
> 202.841u 1.062s 3:24.12 99.8%   9+494k 0+239io 0pf+0w
> 201.909u 0.991s 3:23.39 99.7%   9+494k 0+267io 0pf+0w
> 203.158u 1.001s 3:24.50 99.8%   9+493k 0+256io 0pf+0w
> 
> -O6 --optimize-constructor-last-call (no zeroing of uninstantiated fields)
> 
> 192.669u 1.110s 3:19.69 97.0%   9+503k 703+251io 0pf+0w
> 193.836u 0.901s 3:15.18 99.7%   9+503k 44+254io 0pf+0w
> 192.275u 0.909s 3:13.78 99.6%   9+502k 45+261io 0pf+0w

That's a 5% speedup on the compiler itself, which is
pretty hard to optimize.  Congratulations!

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.
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