# Inline assembler - [Differences from standalone assembler](#differences-from-standalone-assembler) ## Differences from standalone assembler Below is a list of differences between the inline assembler and the standalone disassembler. If something is missing, feel free to contribute to the list! - [Pool constants](#pool-constants) - [Data sections](#data-sections) - [Comments](#comments) ### Pool constants There is no `.word` or other data directives in the inline assembler. Instead, use the built-in `dcd` instruction: ```asm mov r0, [pc, #0] bx lr dcd 0x1234 ``` This can also be written as: ```asm ldconst 0x1234 bx lr ``` The built-in `ldconst` instruction will be replaced by an ARM load instruction and also append a pool constant to the function. ### Data sections Directives such as `.section`, `.data` and `.bss` are not supported in the inline assembler. There might be a way to change section with a `#pragma`, but there's no need to. Data should only be defined in standalone assembly or C/C++. ### Comments Inline assembly is handled by the compiler, so comments must be in C/C++ format. This means using `//` and `/* */` instead of `#` or `;`. Semicolons `;` instead mark the end of an instruction and are optional. You can use them to put multiple instructions on one line, but we avoid doing it so that we can preserve as much similarity to standalone assembly as possible.