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authorRich Felker <dalias@aerifal.cx>2016-01-22 02:58:32 +0000
committerRich Felker <dalias@aerifal.cx>2016-01-22 02:58:32 +0000
commit513c043694f500a01bd8d899ff73441aa7457a1f (patch)
tree50c4cc8fc40a4f847b94542559206bb2fb603529 /arch/x32/src/syscall_cp_fixup.c
parent16b55298dc4b6a54d287d7494e04542667ef8861 (diff)
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overhaul powerpc atomics for new atomics framework
previously powerpc had a_cas defined in terms of its native ll/sc
style operations, but all other atomics were defined in terms of
a_cas. instead define a_ll and a_sc so the compiler can generate
optimized versions of all the atomic ops and perform better inlining
of a_cas.

extracting the result of the sc (stwcx.) instruction is rather awkward
because it's natively stored in a condition flag, which is not
representable in inline asm. but even with this limitation the new
code still seems significantly better.
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