On 7/22/06, Eduardo <[EMAIL PROTECTED]> wrote:
Sorry, but i must disagree. He uses VC6, a compiler from pre-alot-of-processor-advances. So, the compiler can't, not only compile for a more modern and different processor (different pipeline, sse, new processor modes, etc..) but also use old libraries that were made for older processors. For example, in Delphi 6 (if i remember well) code written in pascal run faster than assembly optimized libraries, but written for 386!!!. In powerpc area (what i know), using altivec libraries, boost sort code up to x16, memory2memory copy, assign, move, etc... up to x4 and so on, but if you use a compiler from pre-altivec era or non altivec optimized libraries (including libc), your code will be a lot slower.
While I agree with you on the general, I must note that would be for a CPU-bound application. Most sqlite applications tend to be IO-bound (unless you have enough memory and is all cached), so the differences will not manifest so much. As an aside, there are applications that have better performance with -Os (optimized for size) than with any -O<insert your favorite number here>, because can incur in dramatically less cache misses (which is several times slower than a cache hit and can also imply scheduling decisions against the process/thread). Regards, ~Nuno Lucas
