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ACC registers are a combination of four consecutive vector registers. If the vector registers are assigned first this often forces a number of copies to appear just before the ACC register is created. If the ACC register is assigned first then fewer copies are generated when the vector registers are assigned. This patch tries to force the register allocator to assign the ACC registers first and then the UACC registers and then the vector pair registers. It does this by changing the priority of the register classes. This patch also adds hints to help the register allocator assign UACC registers from known ACC registers and vector pair registers from known UACC registers. Reviewed By: nemanjai Differential Revision: https://reviews.llvm.org/D105854 |
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