Author: Daniel Clausen
Date: 03:05:04 11/27/03
Go up one level in this thread
On November 27, 2003 at 05:54:15, Gerd Isenberg wrote: >On November 27, 2003 at 05:33:17, Gian-Carlo Pascutto wrote: > >>On November 27, 2003 at 05:29:43, Gerd Isenberg wrote: >> >>>Be aware of the "signed extension" penalty if using signed 32-bit variables as >>>array indicies, "long" is still 32-bit with msc but 64-bit in gcc: >> >>Ugh, that sucks! Of course all indexes are int here... > >Yes, the point is to avoid signed 32-bit int as index, due to the additional >sign extension instruction. A signed 64-bit register variable as index register >don't has this problem, but of course that should not imply to use explicitely >64-bit long (gcc) or long long (gcc) or __int64 (msc) as index variables, unless >your arrays are that huge ;-) > >Gerd > >> >>-- >>GCP So using unsigned 32-bit would be a good idea, right? Sargon
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