Tracing/profiling instructions

Question

I\'d like to statistically profile my C code at the instruction level. I need to know how many additions, multiplications, divisions, etc I\'m performing.

This is no

Answer 1

The Linux tool perf will give you a good deal of profiling information; specifically, perf annotate will give you per-instruction relative counts.

It is possible to drill down to the instruction level with perf annotate. For that, you need to invoke perf annotate with the name of the command to annotate. All the functions with samples will be disassembled and each instruction will have its relative percentage of samples reported:

perf record ./noploop 5
perf annotate -d ./noploop

------------------------------------------------
 Percent |   Source code & Disassembly of noploop.noggdb
------------------------------------------------
         :
         :
         :
         :   Disassembly of section .text:
         :
         :   08048484 
:
    0.00 :    8048484:       55                      push   %ebp
    0.00 :    8048485:       89 e5                   mov    %esp,%ebp [...]
    0.00 :    8048530:       eb 0b                   jmp    804853d 
   15.08 :    8048532:       8b 44 24 2c             mov    0x2c(%esp),%eax
    0.00 :    8048536:       83 c0 01                add    $0x1,%eax
   14.52 :    8048539:       89 44 24 2c             mov    %eax,0x2c(%esp)
   14.27 :    804853d:       8b 44 24 2c             mov    0x2c(%esp),%eax
   56.13 :    8048541:       3d ff e0 f5 05          cmp    $0x5f5e0ff,%eax
    0.00 :    8048546:       76 ea                   jbe    8048532  [...]