No support for delayed constants in ARM integrated assembler #18576
Comments
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This is the same as .set, but neither seem available for ARM assembly. Not sure about other architectures, but I think this should be supported as is. This is remarkably similar to what exception handling tables do: .Lset0 = .Leh_func_begin0-.Leh_func_begin0 # >> Call Site 1 << So, it's possible that support is already there, but disconnected from this specific case, since this also fails: .syntax unified start: I'm not sure this is due to the lack of .set/.equ/= directives (which would have produced an error earlier), I believe this is just an issue with literals using computed constants, since this also fails: .syntax unified SYM: |
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mentioned in issue #19300 |
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mentioned in issue #21794 |
Extended Description
I have some assembly code that uses .equ to set a symbol to a computed constant. It works in GCC but not LLVM. I am not sure about the correct terminology, but here is an example:
.syntax unified
.equ size, end - start
add r0, r0, #size
start:
.space 0x10
end:
GCC will compile this to
add r0, r0, #​16. Compiling with llvm-mc gives:set.s:4:13: error: invalid operand for instruction
add r0, r0, #size
^
It works for llvm-mc if the #size is set to a constant (e.g. .set size, 0x10).
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