C / C++ / MFC

Andrew Brock wrote:

When optimising code for SSE, the VC++ compiler does alot of stupid unneeded things that affects performance. This is only the case if the source language was C/C++. If it was done through assemblies it is ok.

Andrew Brock wrote:

If the code was compiled from C++ with the Intel ICL compiler then it is very platform dependant and will have sub-optimal performance on most AMD CPUs due to

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *szValues[] = {
	"3",
	"t",
	"2",
	"the",
	"1",
	"The",
	"T",
	"then",
	"!",
	"THE",
	")",
};

int CmpStr(const void *szVal1, const void *szVal2) {
	return strcmp(*(const char **)szVal1, *(const char **)szVal2);
}

int main() {
	int nVal;
	qsort(szValues, sizeof(szValues) / sizeof(char *), sizeof(char *), CmpStr);
	for (nVal = 0; nVal < sizeof(szValues) / sizeof(char *); ++nVal) {
		printf("%s\n", szValues[nVal]);
	}
	return 0;
}

!
&
1
1
1
2
222
3
33
5
6
7
A
AND
ANDY
ANDY1)
And
And
THE
THE
The
The
a
an
an
andy
andy22
andy3
t
tHe
the
then

!
&
1
1
1
2
3
5
6
7
33
222
a
A
an
an
And
And
AND
andy
ANDY
ANDY1)
andy22
andy3
t
the
tHe
The
The
THE
THE
then

char *szValues[] = {
	
	"The",
	"222",
	"andy",
	"5",
	"AND",
	"6",
	"ANDY1)",
	"ANDY",
	"7",
	"&",
	"the",
	"andy3",
	"an",
	"3",
	"And",
	"1",
	"tHe",
	"THE",
	"1",
	"a",
	"an",
	"A",
	"t",
	"then",
	"The",
	"And",
	"1",
	"tHe",
	"THE",
	"andy22",
	"2",
	"!",
	"33",

};

std::map<char, int> collation_map;

class collator
{
    public:
        collator( std::map<char, int> collation_map ) : collation_map_( collation_map ) {}

        bool operator()( char a, char b )
        {
            return collation_map_[ a ] < collation_map_[ b ];
        }

    private:
        std::map<char, int> collation_map_;
};