[LLVMdev] [PATCH] Detect Haswell subarchitecture (i.e. using -march=native)

[Craig Topper]

It helps that I'm the one who implemented a portion of the code in
X86Subtarget.cpp.


On Thu, Sep 12, 2013 at 11:21 PM, Tim Northover <t.p.northover at gmail.com>wrote:

> > I think your real problem is that garbage went into ECX instead of 0 and
> > caused cpuid to return 0.
>
> Ah, that looks very likely. The value seems to come from "xorl %eax,
> %eax" in both good object files, but a previous cpuid in the bad one.
>
> Excellent work Craig, I suspect that would have taken me days to find.
>
> Tim.
>



-- 
~Craig
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