On Nov 16, 2004, at 5:46 AM, Steven J Abner wrote:
On Tuesday, November 16, 2004, at 01:38 AM, Matt Watson wrote:
Can you rephrase the question? If you post a compilable,
self-contained program that exhibits the issue you're trying to
illustrate, it would be easier to respond. A good problem report will
include:
Thanks for making me think!!! I found the problem. The compiler.
On a PPC two different machines and OS(s) using GCC 2.95.2 NOT 3.3
the code:
"do *--strPtr = ((val_ul & 7) + 48); while ((val_ul >>= 3));"
runs twice as slow as
"do *--strPtr = _lowerhexstr[(val_ul & 7)]; while ((val_ul >>=
3));"
times: first code / second code
110 / 55
Now who should get this this affects systems 10.1.5 - 10.3.6?
Do you need a code snippet?
Yes. In addition, the answers to the below questions would be very
useful:
1) OS versions being used/compared (uname -a will tell you this)
2) Compiler versions being used/compared (cc -v will tell you this)
3) Machine configurations being used/compared
(/usr/sbin/system_profiler SPHardwareDataType will tell you this)
4) Self-contained compilable code example (a single .c file with main())
5) The compiler invocation being used (cc -Os -mdynamic-no-pic -prebind
-o foo foo.c)
6) What you observed/expected ("took 125 seconds on 400MHz G4, took 99
seconds on 300MHz G3. I would have expected the G4 to be faster...")
For your case, it's not clear how to measure the timing you're seeing,
since we don't have a self-contained example.
Even better would be a "recipe" to reproduce. Something like:
1) Install 10.1.5 on a 400MHz PowerMac G3
2) Install the 10.1.5 developer tools (December 2002)
3) Compile the following program with cc -Os -o foo foo.c:
#include <stdio.h>
int
main(void)
{
printf("Hello, World!\n");
return 0;
}
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