On 8/4/15 11:51 PM, Wangnan (F) wrote:
void bpf_store_half(void *skb, int off, int val) asm("llvm.bpf.store.half"); int func() { bpf_store_half(0, 0, 0); return 0; }Compiled with: $ clang -g -target bpf -O2 -S -c test.c And get this: .text .globl func .align 8 func: # @func # BB#0: # %entry mov r1, 0 mov r2, 0 mov r3, 0 call llvm.bpf.store.half
it didn't work because number and types of args were incompatible. Every samples/bpf/sockex[0-9]_kern.c is using llvm.bpf.load.* intrinsics. the typeid changing ids with order is surprising. I think the assertion in ExtractTypeInfo() is not hard. Just there were no such use cases. May be we can do something similar to what LowerIntrinsicCall() does and lower it differently in the backend. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
