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Kwok Cheung Yeung 77c1a1e903 Stash reent marker in upper bits of s1 on AMD GCN
s[0:3] contain a descriptor used to set up the initial value of the
stack, but only the lower 48 bits of s[0:1] are currently used.
The reent marker is currently set in s3, but by stashing it in the
upper 16 bits of s[0:1] instead, s3 can be freed up for other purposes.
2020-10-14 10:54:04 -04:00
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