[llvm-dev] How to use FileCheck to check that two registers are different

[Mark Searles via llvm-dev]

Can FileCheck be used to check that two registers are not the same?

Context: the AMDGPU v_qsad_pk_u16_8 instructions looks like this:
v_qsad_pk_u16_8 dst, src0, src1, src2

The destination register must be different than the source registers. I
know how how to check that, say, src2 is the same as the dst register but
not how to check that src2 is not the same as the dst register.

Here's my initial try, but as you can see it'll pass, rather than fail, if
dst and src2 are the same.
 v_qsad_pk_u16_u8 [[DEST:v\[[0-9]+:[0-9]+\]]], s[{{[0-9]+:[0-9]+}}],
v{{[0-9]+}}, [[DEST]]

Thanks for any suggestions,

Mark
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