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Cross Platform Language / Architecture

I know that assembly language is usually not cross-platform. And even with things like NASM, you still need different code for different architectures and platforms that have different time series and implementations of things like interrupts. But if someone wanted to program in assembly language because they liked it, is there any implementation of a cross-platform assembly language?

Edit:

How about not an assembly in the traditional sense, but a low-level programming language that is very similar to an assembly?

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6 answers

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LLVM - ( ), AT & T, 10 . :

define i32 @add_sub(i32 %x, i32 %y, i32 %z) {
entry:
  %tmp = add i32 %x, %y
  %tmp2 = sub i32 %tmp, %z
  ret i32 %tmp2
}

x86:

; Body
mov eax, edi
add eax, esi
sub eax, edx
ret

LLVM llc 3.3 ( - ):

    .file    "add_sub.ll"
    .text
    .globl    add_sub
    .align    16, 0x90
    .type    add_sub,@function
add_sub:                        # @add_sub
    .cfi_startproc
# BB#0:                         # %entry
    lea    EAX, DWORD PTR [RDI + RSI]
    sub    EAX, EDX
    ret
.Ltmp0:
    .size    add_sub, .Ltmp0-add_sub
    .cfi_endproc


    .section    ".note.GNU-stack","",@progbits

:

lea    EAX, DWORD PTR [RDI + RSI]
sub    EAX, EDX
ret

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