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2021-07-23glasm: Catch more register leaksReinUsesLisp1-2/+4
Add support for null registers. These are used when an instruction has no usages. This comes handy when an instruction is only used for its CC value, with the caveat of having to invalidate all pseudo-instructions before defining the instruction itself in the register allocator. This commits changes this. Workaround a bug on Nvidia's condition codes conditional execution using branches.
2021-07-23glasm: Implement FSWZADDameerj1-2/+11
2021-07-23glasm: Implement derivative instructions on GLASMReinUsesLisp1-8/+8
2021-07-23glasm: Implement shuffle and vote instructions on GLASMReinUsesLisp1-0/+118
2021-07-23glasm: Add GLASM backend infrastructureReinUsesLisp1-0/+0