[LLVMdev] TargetDescription string

Eli Friedman eli.friedman at gmail.com
Fri Oct 26 17:39:42 PDT 2012

On Fri, Oct 26, 2012 at 5:11 PM, Preston Briggs
<preston.briggs at gmail.com> wrote:
> In "Writing an LLVM Compiler Backend", there's some discussion of the
> TargetDescription string, but it doesn't explain the examples I look
> at. For instance, in the description of the PowerPC, I see
>     "E-p:64:64-f64:64:64-i64:64:64-f128:64:128-n32:64"
> What's "preferred alignment" versus "ABI alignment"?
> What are the 3 figures following the "i"? (the documentation suggests
> there will only be 2).
> I see two entries for "f".  Do I read these as info about "f64" and "f128"?
> What is "n32:64" about?



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