Assembly File Listing Example

This topic provides examples of IA-32 and Itanium(TM) architecture assembly file listings and explains how to read them.

IA-32 Assembly Listing Example

$B1$6:                          ; Preds $B1$9
        mov       eax, edx                         ;6.26
        shld      eax, esi, 11                     ;6.26
        or        eax, -2147483648                 ;6.26
        neg       ecx                              ;6.26
        add       ecx, 1054                        ;6.26
        shr       eax, cl                          ;6.26
        test      edx, edx                         ;6.26
        jge       $B1$5         ; Prob 50%         ;6.26
                                ; LOE eax ebx ebp edi

• The ; Preds annotation lists all the basic-blocks that are predecessors of this basic-block.

• The ;6.26 annotation occurs next to every instruction and indicates the source line#.column number that this instruction is associated with. When a 0 appears it means that there is no source information associated with that particular instruction.

• The ; Prob annotation indicates the probability that the conditional jump is taken. This is based either upon a "guess" by the compiler or from profile information from a -prof_use compilation.

• The ; LOE line is the live-on-exit registers. Generally only the integer registers, xmm, and mm registers are printed.

Itanium(TM) Architecture Assembly Listing Example

The following is an example of a portion of an assembly file listing for compilations targeted for Itanium(TM)-based systems:

The following list describes the annotations:

• { identifies the beginning of an bundle.

• .mmi and .mib identify the instruction template types; .mmi indicates two memory and one integer instructions; .mib indicates one memory, one integer, and one branch instruction.

• } identifies the end of an instruction bundle.

• br.call.dpnt b0=bark# identifies a call to the function bark.

• ;; identifies the end of an instruction group.

• The number following the colon (:) in the comment at the end of each instruction indicates the source line number corresponding to that assembly language instruction.