K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2018-07-03T22:03:28.839153Z
K 7
svn:log
V 661
Use 'e' instead of 'i' constraints with 64-bit atomic operations on amd64.

The ADD, AND, OR, and SUB instructions take at most a 32-bit
sign-extended immediate operand.  64-bit constants that do not fit into
that constraint need to be loaded into a register.  The 'i' constraint
tells the compiler it can pass any integer constant to the assembler,
whereas the 'e' constrain only permits constants that fit into a 32-bit
sign-extended value.  This fixes using
atomic_add/clear/set/subtract_long/64 with constants that do not fit into
a 32-bit sign-extended immediate.

Reported by:	several folks
Tested by:	Pete Wright <pete@nomadlogic.org>
MFC after:	2 weeks

END