CODEWITHSUNDEEP
assemblyicc
phuclv
phuclv

Reputation: 41962

What do all those numbers in ICC assembly output mean?

When compiling with ICC, after every instruction is 2 dot-separated numbers prefixed with a hash sign. What does that mean?

For example:

L__routine_start__Z12testFunctionPii_0:
testFunction(int*, int):
        push      rbp                                           #1.42
        mov       rbp, rsp                                      #1.42
        sub       rsp, 32                                       #1.42
        mov       QWORD PTR [-24+rbp], rdi                      #1.42
        mov       DWORD PTR [-16+rbp], esi                      #1.42
        mov       DWORD PTR [-32+rbp], 0                        #2.11
        mov       DWORD PTR [-28+rbp], 0                        #3.14
..B1.2:                         # Preds ..B1.3 ..B1.1
        mov       eax, DWORD PTR [-28+rbp]                      #3.19
        mov       edx, DWORD PTR [-16+rbp]                      #3.23
        cmp       eax, edx                                      #3.23
        jge       ..B1.4        # Prob 50%                      #3.23
...

Upvotes: 4

Views: 275

Answers (1)

HelloWorld
HelloWorld

Reputation: 1863

It's a comment and contains the line and column information of the origin source so you can follow where the instruction comes from. Depending on the optimization level and features like out-of-order execution the lines must not be in a natural order.

Upvotes: 1

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