Hello.
I'm using these commands to compile the code below in order to collect
edge/blocks profiling:
clang -emit-llvm -c sort.c -o sort.bc
opt -insert-edge-profiling sort.bc -o sort_prof.bc
clang sort_prof.bc -lprofile_rt -L/llvms/lib -o sort_prof
then I run the program and display the profiling information using
llvm-prof sort_prof.bc, and the result is:
===-------------------------------------------------------------------------==Function
execution frequencies:
## Frequency
1. 4.3e+05/708539 main
2. 2.8e+05/708539 quickSort
NOTE: 2 functions were never executed!
.....
My question is regarding the execution frequencies. Does make any
sense main executing 4.3e+05 times?
Why so? The code I'm compiling is below.
###################### sort.c ########################
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
const int MAX = 1000000;
void swap(int* a, int* b) {
int tmp;
tmp = *a;
*a = *b;
*b = tmp;
}
int partition(int vec[], int left, int right) {
int i, j;
i = left;
for (j = left + 1; j <= right; ++j) {
if (vec[j] < vec[left]) {
++i;
swap(&vec[i], &vec[j]);
}
}
swap(&vec[left], &vec[i]);
return i;
}
void quickSort(int vec[], int left, int right) {
int r;
if (right > left) {
r = partition(vec, left, right);
quickSort(vec, left, r - 1);
quickSort(vec, r + 1, right);
}
}
int main(void) {
int vet[MAX], i=0;
srand(time(NULL));
for (i=0; i<MAX; i++) {
vet[i] = rand() % 654321;
}
quickSort(vet, 0, MAX-1);
for (i=0; i<MAX; i++) {
if ((rand() % 7) > 2) {
printf("Num$[%d] = %d\n", i, vet[i]);
}
else if ((rand() % 4) > 2) {
printf("Num@[%d] = %d\n", i, vet[i]);
}
else if ((rand() % 2) > 1) {
printf("Num#[%d] = %d\n", i, vet[i]);
}
}
return 0;
}
Hello, See answers below On 31/01/13 00:23, César wrote:> Hello. > > I'm using these commands to compile the code below in order to collect > edge/blocks profiling: > > clang -emit-llvm -c sort.c -o sort.bc > opt -insert-edge-profiling sort.bc -o sort_prof.bc > clang sort_prof.bc -lprofile_rt -L/llvms/lib -o sort_prof > > then I run the program and display the profiling information usingYou can also skip the compilation step and run directly through the interpreter lli -load /llvms/lib/libprofile_rt.so sort_prof.bc> llvm-prof sort_prof.bc, and the result is: >try running llvm-prof on the original (non instrumented) code, that should give you the correct results llvm-prof sort.bc Cheers, Roel
Hi Roel, many thanks, it worked perfectly now! César. 2013/1/31 Roel Jordans <r.jordans at tue.nl>:> Hello, > > See answers below > > > On 31/01/13 00:23, César wrote: >> >> Hello. >> >> I'm using these commands to compile the code below in order to collect >> edge/blocks profiling: >> >> clang -emit-llvm -c sort.c -o sort.bc >> opt -insert-edge-profiling sort.bc -o sort_prof.bc >> clang sort_prof.bc -lprofile_rt -L/llvms/lib -o sort_prof >> >> then I run the program and display the profiling information using > > > You can also skip the compilation step and run directly through the > interpreter > > lli -load /llvms/lib/libprofile_rt.so sort_prof.bc > > >> llvm-prof sort_prof.bc, and the result is: >> > > try running llvm-prof on the original (non instrumented) code, that should > give you the correct results > > llvm-prof sort.bc > > Cheers, > Roel > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev