[Bug target/43766] x86 prefetch doesn't use complex memory addressing

[ubizjak at gmail dot com]

------- Comment #4 from ubizjak at gmail dot com  2010-04-17 15:11 -------
(In reply to comment #3)
> Works with x86-64.
> 
> Checking -m32, the same thing happens with or without the patch:

This happens because combine pulls memory references into the combined address
operand. Since ix86_decompose_address expects registers everywhere, it fails.

The same happens with:

int * p(int *a, int i)
{
    return &a[i];
}

So, this particular case is unfixable on -m32. Try with -mregparm=3.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43766