powerpc/bpf: Emit a single branch instruction for known short branch ranges

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PPC_BCC() emits two instructions to accommodate scenarios where we need
to branch outside the range of a conditional branch. PPC_BCC_SHORT()
emits a single branch instruction and can be used when the branch is
known to be within a conditional branch range.

Convert some of the uses of PPC_BCC() in the powerpc BPF JIT over to
PPC_BCC_SHORT() where we know the branch range.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/edbca01377d1d5f472868bf6d8962b0a0d85b96f.1644834730.git.naveen.n.rao@linux.vnet.ibm.com

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Naveen N. Rao 2022-02-14 16:11:36 +05:30 • committed by Michael Ellerman

parent acd7408d27

commit bafb5898de

2 changed files with 8 additions and 8 deletions

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8

arch/powerpc/net/bpf_jit_comp32.c

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8

arch/powerpc/net/bpf_jit_comp64.c

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