[Bug target/90568] stack protector should use cmp or sub, not xor, to allow macro-fusion on x86

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90568

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The xor there is intentional, for security reasons we do not want the stack
canary to stay in the register afterwards, because then it could be later
spilled or accessible to some exploit in another way.