I'm working on parsing RISC-V assembly, and am working on parsing immediates. Using the LUI instruction as an example, I'm seeing examples which write it like lui t0, 0, and examples which write it like lui t0,%hi(string1). Is the 2nd example a psudeoinstruction, and is there any documentation on how each notation works?
Is there a set format on how immediates are shown in RISC-V assembly?
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You can find documentation for modifiers like
%hiin the GNU assembler manual.%hi(sym)evaluates to the high 20 bits of the address of the symbolsym. It's no different to the machine from something likelui t0, 0xabcde, just that the assembler is computing the value of the immediate for you.luiencodes a 20-bit immediate, solui t0, %hi(sym)is one single instruction, not a pseudo-instruction.