[LLVMdev] LLVM Newbie. Questions about backend.

[Gordon Henriksen]

On 2007-10-26, at 05:52, Sami Ahlberg wrote:

> Question 2:
> What kind of information if any the front end needs about the  
> target architecture? Am I able to use gcc front end to compile for  
> the new architecture and what if there are 32- and 64-bit versions  
> of the architecture? Is there an alternative front end and how does  
> that handle the same issues?

To use llvm-gcc, you'll need to specifically enhance it with support  
for your architecture. llvm-gcc does much target-specific processing  
before and during LLVM IR codegen; its output is not at all portable.

In the LLVM IR, portable code is possible, but not guaranteed. llvm- 
gcc effectively never generates portable IR.

— Gordon

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