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authorDavid S. Miller <davem@davemloft.net>2017-04-24 15:56:21 -0700
committerDavid S. Miller <davem@davemloft.net>2017-04-24 15:56:21 -0700
commite3a724edeec3836ed44675a6587a6db7b6b68dbe (patch)
treecdcbe0a1744dfab53ab153dd0aff850d1746060e /COPYING
parent0e43d1009d64afcc57bfb5155f1a36c395fac178 (diff)
downloadlinux-e3a724edeec3836ed44675a6587a6db7b6b68dbe.tar.bz2
sparc64: Support cbcond instructions in eBPF JIT.
cbcond combines a compare with a branch into a single instruction. The limitations are: 1) Only newer chips support it 2) For immediate compares we are limited to 5-bit signed immediate values 3) The branch displacement is limited to 10-bit signed 4) We cannot use it for JSET Also, cbcond (unlike all other sparc control transfers) lacks a delay slot. Currently we don't have a useful instruction we can push into the delay slot of normal branches. So using cbcond pretty much always increases code density, and is therefore a win. Signed-off-by: David S. Miller <davem@davemloft.net>
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