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authorRichard Sandiford <rsandifo@linux.vnet.ibm.com>2013-10-01 11:26:28 +0000
committerRichard Sandiford <rsandifo@linux.vnet.ibm.com>2013-10-01 11:26:28 +0000
commit0755c93b0cf4695ac61092509790f0cd6ddb1812 (patch)
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[SystemZ] Use upper words of GR64s for codegen
This just adds the basics necessary for allocating the upper words to virtual registers (move, load and store). The move support is parameterised in a way that makes it easy to handle zero extensions, but the associated zero-extend patterns are added by a later patch. The easiest way of testing this seemed to be add a new "h" register constraint for high words. I don't expect the constraint to be useful in real inline asms, but it should work, so I didn't try to hide it behind an option. llvm-svn: 191739
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