11-30-2011
Building in constants usually means a performance improvement. They can often be built right into the machine code using instructions that take a literal value( i.e. a single instruction literally meaning 'x+=2') The program doesn't need to waste memory on the constant, bother retrieving it for anywhere, or waste a register storing it when you need to do anything with it. So you get more work with fewer and simpler instructions.
If your constants are being stored in memory at all, let alone over and over, you might be doing it wrong. Since you didn't post your .h file though, I'd only be guessing at how.
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isalist(1) User Commands isalist(1)
NAME
isalist - display the native instruction sets executable on this platform
SYNOPSIS
isalist
DESCRIPTION
isalist prints the names of the native instruction sets executable on this platform on the standard output, as returned by the SI_ISALIST
command of sysinfo(2).
The names are space-separated and are ordered in the sense of best performance. That is, earlier-named instruction sets may contain more
instructions than later-named instruction sets; a program that is compiled for an earlier-named instruction sets will most likely run
faster on this machine than the same program compiled for a later-named instruction set.
Programs compiled for instruction sets that do not appear in the list will most likely experience performance degradation or not run at all
on this machine.
The instruction set names known to the system are listed in isalist(5). These names may or may not match predefined names or compiler
options in the C language compilation system,
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
optisa(1), uname(1), sysinfo(2), attributes(5), isalist(5)
SunOS 5.10 25 Jul 1997 isalist(1)