forked from OSchip/llvm-project
c765240060
I'm not entirely sure this is the correct thing to do with the global isel philosophy, but I think this is necessary to handle how differently SGPRs are used normally vs. from a condition. For example, it makes sense to allow a copy from a VGPR to an SGPR, but it makes no sense to allow a copy from VGPRs to SGPRs used as select mask. This avoids regbankselecting strange code with a truncate feeding directly into a condition field. Now a copy is forced from sgpr(s1) to vcc, which is more sensible to handle. Some of these issues could probably avoided with making enough operations resulting in i1 illegal. I think we can't avoid this register bank for legality. For example, an i1 and where one source is from a truncate, and one source is a compare needs some kind of copy inserted to make sure both are in condition registers. llvm-svn: 350611 |
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