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What difference are two kinds of labels of compiler for ARM A8 core?

Jeff Wong1
Expert 1305 points

Hi,

When I check compiler generated assembly code, I find that there are two kinds of labels. One kind begins with a '$' sign. This is a normal case. The other begins with a vertical bar '|', which is rather weird to me. In fact, it has two vertical bars outside a '$' prefix label.

The CPU is ARM Cortex A8, while the compiler is:

"C:/ti/ccsv6/tools/compiler/ti-cgt-arm_5.2.4 ...

It is under Windows 7, OS.

Could you tell me why a label begins with '||"?

Thanks,

||$C$L21||:
; .dwpsn file "../hello2d.c",line 319,column 1,is_stmt,isa 1

$C$DW$73 .dwtag  DW_TAG_TI_branch

  • 0
    TI__Guru* 84225 points
    The ||xyz|| operator instructs the assembler to take "xyz" as a user-defined symbol. This is used in case "xyz" just so happens to be the same as a built-in assembler operator or identifier like "NOP". In this case, $C$L21 is not actually an assembler built-in, but the compiler is just being cautious; it does not affect the object code generated for this example.