[LLVMdev] Regular Expressions
clattner at apple.com
Mon Jun 15 12:35:14 PDT 2009
On Jun 15, 2009, at 11:33 AM, David Greene wrote:
> To reduce redundancy, developers must be able to write generic
> like this:
> [(set DSTREGCLASS:$dst, // rr, rrr
> (xor (INTSRCTYPE (bitconvert (SRCTYPE SRCREGCLASS:$src1))),
> (INTSRCTYPE (bitconvert (SRCTYPE SRCREGCLASS:$src2)))))],
> The substitution then fills in the appropriate types, etc. based
> on which variant (32-bit, 64-bit, AVX, etc.) is being produced.
> I suppose you could argue that additional parameters specifying
> the source and dest types could be passed, but why bother when
> it is already encoded in the mnemonic? That would just be
> adding error-prone redundancy.
Why not synthesize the opcode string from the information passed down?
More information about the llvm-dev