Thanks! I upgrade LLVM to 4.0.0 and this error no longer shows up. William
On Sat, Oct 22, 2016 at 8:33 AM, Alexei Starovoitov <[email protected]> wrote: > On Fri, Oct 21, 2016 at 11:38 PM, William Tu via iovisor-dev > <[email protected]> wrote: >> Hi, >> I'm running into this LLVM ERROR at compile time. Does anyone seem >> this before or can give me some suggestions? thanks! >> >> ------- >> LLVM ERROR: Cannot select: 0x3bafa28: ch = brind 0x3bc98f0:1, >> 0x3bc98f0 [ORD=1] [ID=9] >> 0x3bc98f0: i64,ch = load 0x3bb0db0:1, 0x3baf588, >> 0x3bc8c58<LD8[JumpTable]> [ORD=1] [ID=8] >> 0x3baf588: i64 = add 0x3bade48, 0x3bb06c0 [ORD=1] [ID=7] >> 0x3bade48: i64 = shl 0x3bb0db0, 0x3bb0470 [ORD=1] [ID=6] >> 0x3bb0db0: i64,ch = CopyFromReg 0x3b78a00, 0x3bad2b8 [ORD=1] [ID=5] >> 0x3bad2b8: i64 = Register %vreg1 [ID=1] >> 0x3bb0470: i64 = Constant<3> [ID=4] >> 0x3bb06c0: i64 = JumpTable<0> [ID=2] >> 0x3bc8c58: i64 = Constant<0> [ID=3] >> In function: main_proto >> samples/bpf/Makefile:128: recipe for target 'samples/bpf/sockex3_kern.o' >> failed >> >> My C code is below: >> ---------------------------------- >> SEC("socket/0") >> static int main_proto(struct __sk_buff *skb) >> { >> u32 proto2 = skb->cb[1]; >> switch (proto2) { >> case 0: >> skb->cb[2]= 0; >> break; >> case 1: >> skb->cb[2]= 1; >> break; >> case 2: >> skb->cb[2]= 2; >> break; >> case 3: >> skb->cb[2]= 3; >> break; >> default: >> break; >> } >> return 0; >> } >> >> I found that removing "case 3" will prevent the error, but then I >> could only have 3 cases. >> [root@vm-dev bpf]# clang --version >> clang version 3.7.0 (tags/RELEASE_370/final) >> [root@vm-dev lib]# llc --version >> LLVM (http://llvm.org/): >> LLVM version 3.7.0 > > 3.7.0 has several known bugs. Please upgrade to 3.7.1 or higher. > jumptable should have been converted to branches by backend... _______________________________________________ iovisor-dev mailing list [email protected] https://lists.iovisor.org/mailman/listinfo/iovisor-dev
