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db73d35912
Alas, using half the available vector registers in a single instruction is just too much for the register allocator to handle. The mve-vldst4.ll test here fails when these instructions are enabled at present. This patch disables the generation of VLD4 and VST4 by adding a mve-max-interleave-factor option, which we currently default to 2. Differential Revision: https://reviews.llvm.org/D71109
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