f8d3bdf6a2
SIFixSGPRCopies handled STRICT_WWM (and similar WWM/WQM pseudos) like a COPY. In particular, if the source was a VGPR and the result was an SGPR, lowerVGPR2SGPRCopies would replace it with a readfirstlane, erasing the original pseudo and hence sabotaging the WWM region marking which is supposed to be performed by SIWholeQuadMode. Fix this by handling it more like INSERT_SUBREG, PHI and REG_SEQUENCE: if the source is a VGPR then move the result to a VGPR, and keep the pseudo.
The LLVM Compiler Infrastructure
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