path: root/arch/x32
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authorRich Felker <>2016-01-22 02:58:32 +0000
committerRich Felker <>2016-01-22 02:58:32 +0000
commit513c043694f500a01bd8d899ff73441aa7457a1f (patch)
tree50c4cc8fc40a4f847b94542559206bb2fb603529 /arch/x32
parent16b55298dc4b6a54d287d7494e04542667ef8861 (diff)
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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