[LLVMdev] Why IR portable?

[汶翰 (Wen-Han)]

Dear all,

I cannot find the answer of this question.
We all know LLVM IR is portable, but it uses ILP32 and record the target
layout within the IR.

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64
:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"

target triple = "x86_64-linux-gnu"


It seems it already assigned their sizes mapping with types.
How can it be portable? Isn't it been written there?

If any response, I'm appreciated for that.
Thank you.

-- 
Best regards,
Wen-Han (Nowar)
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