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| author | Jiong Wang <jiwang@tilera.com> | 2019-02-07 10:43:09 +0000 |
|---|---|---|
| committer | Jiong Wang <jiwang@tilera.com> | 2019-02-07 10:43:09 +0000 |
| commit | 66b18e575571da027e31e4db07500835dcefb7f7 (patch) | |
| tree | 0cf37e6b90ac34fbd8cbf9baa57b2a9781c2d40a /llvm/lib/Target/BPF/Disassembler | |
| parent | 638110a20883df1ca86d2046ec5263b5af899bf9 (diff) | |
| download | bcm5719-llvm-66b18e575571da027e31e4db07500835dcefb7f7.tar.gz bcm5719-llvm-66b18e575571da027e31e4db07500835dcefb7f7.zip | |
[BPF] add code-gen support for JMP32 instructions
JMP32 instructions has been added to eBPF ISA. They are 32-bit variants of
existing BPF conditional jump instructions, but the comparison happens on
low 32-bit sub-register only, therefore some unnecessary extensions could
be saved.
JMP32 instructions will only be available for -mcpu=v3. Host probe hook has
been updated accordingly.
JMP32 instructions will only be enabled in code-gen when -mattr=+alu32
enabled, meaning compiling the program using sub-register mode.
For JMP32 encoding, it is a new instruction class, and is using the
reserved eBPF class number 0x6.
This patch has been tested by compiling and running kernel bpf selftests
with JMP32 enabled.
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
llvm-svn: 353384
Diffstat (limited to 'llvm/lib/Target/BPF/Disassembler')
| -rw-r--r-- | llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp b/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp index 43de8b6ebb3..ed09e446e73 100644 --- a/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp +++ b/llvm/lib/Target/BPF/Disassembler/BPFDisassembler.cpp @@ -39,7 +39,7 @@ public: BPF_STX = 0x3, BPF_ALU = 0x4, BPF_JMP = 0x5, - BPF_RES = 0x6, + BPF_JMP32 = 0x6, BPF_ALU64 = 0x7 }; |
