Author: Omid David Tabibi
Date: 15:22:32 08/21/03
I changed some data structures in my program and added two functions (the
variables are renamed below):
void func1(unsigned int &a, int b, int c) {
a += array[b][c];
}
BOOL func2(unsigned int a, int b, int c) {
return (a & mask[b][c]);
}
These two functions are very heavily used all over the program. In MSVC 6 I use
the "inline any suitable" option for inlining, so I assumed that the compiler
would definitely inline these functions. But again, "assumption is the mother of
all f**k-ups", after turning the warning level to 4, I found out that these
functions were not chosen for inlining... strange for itself.
So I added a __forceinline to each of them and recompiled. But still the speedup
was negligible. So instead I wrote the following two macros:
#define func1(a,b,c) (a += array[b][c])
#define func2(a,b,c) ((a) & mask[b][c])
Wao! about 20% speedup! I was certain that the two functions were not inlined
previously when I added __forceinline. So I checked it again in warning level of
4, but didn't find any warning indicating that they were not inlined (if you
mention __inline or __forceinline, and the compiler can't inline, a warning is
typically displayed).
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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