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Added 'C_C++/manual_unrolling.c'

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anon 2024-07-22 19:39:19 +02:00
parent 0f47ef8aae
commit 0544c23fd7
1 changed files with 18 additions and 0 deletions
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C_C++/manual_unrolling.c Normal file
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// @BAKE gcc $@ -o $*.out -O0 -ggdb
signed main() {
char * src = "hey";
char dest[4];
int n = 0;
int j = 0;
int i = 0;
// Duff [8, 13] used this to provide a manual version of loop unrolling for older compilers and hardware:
switch(n & 0x3) {
do {
case 0: dest[i++] = src[j++];
case 1: dest[i++] = src[j++];
case 2: dest[i++] = src[j++];
case 3: dest[i++] = src[j++];
} while (j < n);
}
return 0;
}