mitchalsup@aol.com (MitchAlsup1) writes:--------------
Architecture defines the primitives, Hardware provides the primitives,>>
My argument is that this is a SW decision (in the compiler) not a
HW decision (other than providing the PREDs).
That's a position, not an argument. Do you have an argument for your
position?
SW decides to use them (or not) on a case-by-case basis.
When there is an else-clause, the PRED uses 1 fewer instruction:Since PREDs are not>
predicted (unless you think they are predicted BOTH ways) they do
not diminish the performance of the branch predictors.
Nor increase it.
the branch that exits the then-clause and jumps over the else-
clause does not exist.
But it sounds like you think that the compilerCompiler is setup to use PRED when the then-clause is 8 or fewer
should choose predication when the condition is not particularly
predictable. How should the compiler know that?
instructions and when the else clause is 8 or fewer instructions,
otherwise it uses branches.
----------
>
- anton
| Date | Sujet | # | Auteur | |
| 17 Apr 25 |  Re: register sets | 56 | Robert Finch | |
| 17 Apr 25 |  Re: register sets | 53 | Stephen Fuld | |
| 17 Apr 25 |   Re: register sets | 1 | Robert Finch | |
| 17 Apr 25 | Re: register sets | 46 | MitchAlsup1 | |
| 18 Apr 25 |  Re: register sets | 45 | Robert Finch | |
| 18 Apr 25 |  Re: register sets | 44 | MitchAlsup1 | |
| 20 Apr 25 | Re: register sets | 43 | Robert Finch | |
| 21 Apr 25 | Re: auto predicating branches | 42 | Robert Finch | |
| 21 Apr 25 | Re: auto predicating branches | 41 | Anton Ertl | |
| 21 Apr 25 | Is an instruction on the critical path? (was: auto predicating branches) | 1 | Anton Ertl | |
| 21 Apr 25 | Re: auto predicating branches | 39 | MitchAlsup1 | |
| 22 Apr 25 | Re: auto predicating branches | 38 | Anton Ertl | |
| 22 Apr 25 | Re: auto predicating branches | 1 | MitchAlsup1 | |
| 22 Apr 25 | Re: auto predicating branches | 36 | Anton Ertl | |
| 22 Apr 25 | Re: auto predicating branches | 35 | MitchAlsup1 | |
| 23 Apr 25 | Re: auto predicating branches | 3 | Stefan Monnier | |
| 23 Apr 25 | Re: auto predicating branches | 2 | Anton Ertl | |
| 25 Apr 25 | Re: auto predicating branches | 1 | MitchAlsup1 | |
| 23 Apr 25 | Re: auto predicating branches | 31 | Anton Ertl | |
| 23 Apr 25 | Re: auto predicating branches | 30 | MitchAlsup1 | |
| 24 Apr 25 | Re: asynch register rename | 29 | Robert Finch | |
| 27 Apr 25 | Re: fractional PCs | 28 | Robert Finch | |
| 27 Apr 25 | Re: fractional PCs | 27 | MitchAlsup1 | |
| 28 Apr 25 | Re: fractional PCs | 26 | Robert Finch | |
| 28 Apr 25 | Re: fractional PCs | 15 | MitchAlsup1 | |
| 29 Apr 25 | Re: fractional PCs | 14 | Robert Finch | |
| 5 May 25 | Re: control co-processor | 13 | Robert Finch | |
| 5 May 25 | Re: control co-processor | 12 | Al Kossow | |
| 5 May 25 | Re: control co-processor | 11 | Stefan Monnier | |
| 6 May 25 | Re: control co-processor | 3 | MitchAlsup1 | |
| 7 May 25 | Re: control co-processor | 1 | MitchAlsup1 | |
| 15 Jul 25 | Re: control co-processor | 1 | MitchAlsup1 | |
| 7 May 25 | Scan chains (was: control co-processor) | 7 | Stefan Monnier | |
| 7 May 25 | Re: Scan chains (was: control co-processor) | 2 | Al Kossow | |
| 7 May 25 | Re: Scan chains | 1 | Stefan Monnier | |
| 7 May 25 | Re: Scan chains | 3 | MitchAlsup1 | |
| 7 May 25 | Re: Scan chains | 2 | Stefan Monnier | |
| 8 May 25 | Re: Scan chains | 1 | MitchAlsup1 | |
| 15 Jul 25 | Re: Scan chains | 1 | MitchAlsup1 | |
| 29 Apr 25 | Re: fractional PCs | 10 | Robert Finch | |
| 29 Apr 25 | Re: fractional PCs | 9 | MitchAlsup1 | |
| 30 Apr 25 | Re: fractional PCs | 8 | Robert Finch | |
| 30 Apr 25 | Re: fractional PCs | 6 | Thomas Koenig | |
| 1 May 25 | Re: fractional PCs | 1 | Robert Finch | |
| 2 May 25 | Re: fractional PCs | 4 | moi | |
| 2 May 25 | Re: millicode, extracode, fractional PCs | 2 | John Levine | |
| 2 May 25 | Re: millicode, extracode, fractional PCs | 1 | moi | |
| 2 May 25 | Re: fractional PCs | 1 | moi | |
| 30 Apr 25 | Re: fractional PCs | 1 | MitchAlsup1 | |
| 15 Jul 25 | Re: register sets | 5 | John Savard | |
| 15 Jul 25 | Re: register sets | 4 | MitchAlsup1 | |
| 19 Jul 25 | Re: register sets | 3 | Robert Finch | |
| 19 Jul 25 | Re: register sets | 2 | Anton Ertl | |
| 19 Jul 25 | Re: register sets | 1 | MitchAlsup1 | |
| 15 Jul 25 | Re: register sets | 2 | John Savard | |
| 15 Jul 25 | Re: register sets | 1 | MitchAlsup1 |
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