diff options
| author | Alexei Starovoitov <[email protected]> | 2022-10-19 23:53:51 +0000 |
|---|---|---|
| committer | Alexei Starovoitov <[email protected]> | 2022-10-19 23:53:51 +0000 |
| commit | 04a8f9d7c09d04ba39e84611adfe6f48e30353c3 (patch) | |
| tree | 3de533d16556810b08caba926d43effd89c62a45 /tools/bpf/bpftool/prog.c | |
| parent | Merge branch 'libbpf: support non-mmap()'able data sections' (diff) | |
| parent | bpf: add selftests for lsh, rsh, arsh with reg operand (diff) | |
| download | kernel-04a8f9d7c09d04ba39e84611adfe6f48e30353c3.tar.gz kernel-04a8f9d7c09d04ba39e84611adfe6f48e30353c3.zip | |
Merge branch 'bpf,x64: Use BMI2 for shifts'
Jie Meng says:
====================
With baseline x64 instruction set, shift count can only be an immediate
or in %cl. The implicit dependency on %cl makes it necessary to shuffle
registers around and/or add push/pop operations.
BMI2 provides shift instructions that can use any general register as
the shift count, saving us instructions and a few bytes in most cases.
Suboptimal codegen when %ecx is source and/or destination is also
addressed and unnecessary instructions are removed.
test_progs: Summary: 267/1340 PASSED, 25 SKIPPED, 0 FAILED
test_progs-no_alu32: Summary: 267/1333 PASSED, 26 SKIPPED, 0 FAILED
test_verifier: Summary: 1367 PASSED, 636 SKIPPED, 0 FAILED (same result
with or without BMI2)
test_maps: OK, 0 SKIPPED
lib/test_bpf:
test_bpf: Summary: 1026 PASSED, 0 FAILED, [1014/1014 JIT'ed]
test_bpf: test_tail_calls: Summary: 10 PASSED, 0 FAILED, [10/10 JIT'ed]
test_bpf: test_skb_segment: Summary: 2 PASSED, 0 FAILED
---
v4 -> v5:
- More comments regarding instruction encoding
v3 -> v4:
- Fixed a regression when BMI2 isn't available
====================
Signed-off-by: Alexei Starovoitov <[email protected]>
Diffstat (limited to 'tools/bpf/bpftool/prog.c')
0 files changed, 0 insertions, 0 deletions