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* -funroll-all-loops
@ 2000-01-07 17:07 Igor Schein
  2000-04-01  0:00 ` -funroll-all-loops Igor Schein
  0 siblings, 1 reply; 2+ messages in thread
From: Igor Schein @ 2000-01-07 17:07 UTC (permalink / raw)
  To: help-gcc

Hi,

I have a question about the following segment of info pages
for gcc:

`-funroll-all-loops'
     Perform the optimization of loop unrolling.  This is done for all
     loops and usually makes programs run more slowly.
     `-funroll-all-loops' implies `-fstrength-reduce' as well as
     `-frerun-cse-after-loop'.

Does 
"usually makes programs run more slowly" 
imply 
"however, for some rare cases it _will_ make them run faster"?  

If it doesn't, then I don't see a point of using this flag at all.

Thanks

Igor

^ permalink raw reply	[flat|nested] 2+ messages in thread
* -funroll-all-loops
  2000-01-07 17:07 -funroll-all-loops Igor Schein
@ 2000-04-01  0:00 ` Igor Schein
  0 siblings, 0 replies; 2+ messages in thread
From: Igor Schein @ 2000-04-01  0:00 UTC (permalink / raw)
  To: help-gcc

Hi,

I have a question about the following segment of info pages
for gcc:

`-funroll-all-loops'
     Perform the optimization of loop unrolling.  This is done for all
     loops and usually makes programs run more slowly.
     `-funroll-all-loops' implies `-fstrength-reduce' as well as
     `-frerun-cse-after-loop'.

Does 
"usually makes programs run more slowly" 
imply 
"however, for some rare cases it _will_ make them run faster"?  

If it doesn't, then I don't see a point of using this flag at all.

Thanks

Igor

^ permalink raw reply	[flat|nested] 2+ messages in thread
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2000-01-07 17:07 -funroll-all-loops Igor Schein
2000-04-01  0:00 ` -funroll-all-loops Igor Schein

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