[PATCH 1/2] s/390: Implement "target" attribute.
Andreas Krebbel
krebbel@linux.vnet.ibm.com
Mon Nov 9 07:10:00 GMT 2015
On 10/31/2015 06:58 PM, Dominik Vogt wrote:
> But what the heck is this "exact power of 2" limitation good for
> in the first place? Why is a stack size of 1, 2 or
> 36028797018963968 valid, but not 800? Shouldn't the stack size
> (and the size of the stack guard) just be multiples of the stack
> slot size?
That's because of the way we implement the stack check. We use test under mask to check for certain
bits instead of doing the full math and compare.
-Andreas-
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