Re: [PATCH] C inlined assembly for reproducing max<min

[Eduard Zingerman <eddyz87@gmail.com>]

On Wed, 2023-11-22 at 10:15 -0800, Alexei Starovoitov wrote:
[...]
> >   multiclass J<BPFJumpOp Opc, string OpcodeStr, PatLeaf Cond, PatLeaf Cond32> {
> >     def _rr : JMP_RR<Opc, OpcodeStr, Cond>;
> >     def _ri : JMP_RI<Opc, OpcodeStr, Cond>;
> > @@ -265,6 +329,10 @@ defm JULT : J<BPF_JLT, "<", BPF_CC_LTU, BPF_CC_LTU_32>;
> >   defm JULE : J<BPF_JLE, "<=", BPF_CC_LEU, BPF_CC_LEU_32>;
> >   defm JSLT : J<BPF_JSLT, "s<", BPF_CC_LT, BPF_CC_LT_32>;
> >   defm JSLE : J<BPF_JSLE, "s<=", BPF_CC_LE, BPF_CC_LE_32>;
> > +def JSET_RR    : JSET_RR<"&">;
> > +def JSET_RI    : JSET_RI<"&">;
> > +def JSET_RR_32 : JSET_RR_32<"&">;
> > +def JSET_RI_32 : JSET_RI_32<"&">;
> >   }
> > 
> >   // ALU instructions
> > 
> > can solve your inline asm issue. We will discuss whether llvm compiler
> > should be implementing this instruction from source or not.
> 
> I'd say 'yes'. clang/llvm should support such asm syntax.
> 
> Jose, Eduard,
> Thoughts?

I agree, since instruction is documented it should have assembly
representation. All other instructions from instruction-set.rst seem
to have one.